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Bill
2021-05-19 02:41:33 +08:00
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hw3/.gitignore
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.DS_Store
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hw3/README.md
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# graphics_hw3
[link](https://billsun.dev/graphics/hw3)
hw3/RTXoff.svg
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<g>
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</svg>
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hw3/index.html
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<script src=lib3.js></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.4.12/ace.js"crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.4.12/ext-language_tools.js" crossorigin="anonymous"></script>
<style>
.ace_gutter-layer {
/* original width is 48px */
width: 25px !important;
}
.ace_gutter-layer > * {
/* 48 - 32 = 16 */
margin-left: 0;
}
.ace_gutter-cell {
padding-left: 0 !important;
padding-right: 3px !important;
}
.code{
font-family: "monaco, menlo, ubuntu mono, consolas, source-code-pro" ;
}
</style>
<body bgcolor=white text=black link=black alink=blue vlink=blue>
<center>
<!!--- SUPER SAMPLING THE W/H PARAMS FOR CANVAS ARE RENDER SIZE, IN THE CSS IS ACTUAL(DISPLAY) SIZE.--->
<canvas id='canvas1' style=" overflow: hidden !important; width: 600px !important; height:600px !important;" width=600 height=600></canvas>
</center>
</body>
<!!-------- VERTEX SHADER: YOU PROBABLY DON'T WANT TO CHANGE THIS RIGHT NOW -------->
<script id='my_vertex_shader' type='x-shader/x-vertex'>
attribute vec3 aPos;
varying vec3 vPos;
void main() {
gl_Position = vec4(aPos, 1.);
vPos = aPos;
}
</script>
<!!-------- FRAGMENT SHADER: THIS IS WHERE YOU WILL DO YOUR WORK -------->
<!!-------- FRAGMENT SHADER: MOVED TO ./shader.frag!! LOADED IN lib2.js -------->
<!--script src="shader.frag" id='my_fragment_shader' type='x-shader/x-fragment'> </script>
<!!-------- CREATE A PROPERLY DESCRIPTIVE TITLE BELOW -------->
<script id='my_title' type='text/html'>
RTX Extreme
</script>
<!!-------- HERE IS WHERE YOU CAN PROVIDE A LONGER TEXT DESCRIPTION -------->
<script id='my_instructions' type='text/html'><font color=#909090>
<p style="font-size:30px; ">In this homework, I implemented Global illumination w/
Realtime Recursive Ray Tracing!
<p>
<i style="font-size:25px;">Usage: </i>
<ul>
<li>Ctrl+Alt/Option+T: Toggle Texture.</li>
<li>Ctrl+S: Download fragment shader.</li>
<li>Ctrl+Alt/Option+N: Reset ViewPoint.</li>
<li>Ctrl+Alt/Option+P: Toggle Pause/Resume.</li>
<li style="color:red;">Please unfocus the Editing area (click somewhere else on the page) to use hotkeys.</li>
<li>Double Click on canvas (WITHOUT key modifiers): Toggle Pause/Resume.</li>
<li>DRAG, SCROLL on canvas: Changing Viewing point.</li>
<li>Please use Chromium based browser.</li>
<li>Super Sampling(0.25x-4x): increase rendering size for better visual or decrease rendering size for better performance.</li>
<li>Spheres(1 - 5): number of spheres, performance will suffer if adding too many spheres.</li>
</ul>
<i style="font-size:25px;">How it works:</i>
<ul>
<li>I added recursive ray tracing with fraction support.</li>
<li><a style="color:red;">About the scene: </a>There're two spheres in the center, the bouncing one in the very center (the Earth) is not transparent nor is it reflective,
the outer one is both transparent and reflective and has the texture of the Sun(barely distinguishable).
The small sphere embedded running circle is reflective but not transparent. You can also add
two additional spheres via the button above. (up to 5).
</li>
<li>If your scene is clipped, this is a bug from chromium, you may reset the viewport by adjust super sampling.</li>
<li>Each hit will now spawn 2 rays, but there're serious performance issues, because
the number of rays increases exponentially. I resolved this issue by:
</li>
<ul>
<li>Pruning: If the weight of this ray is too small, dispose it.</li>
<li>Smarter Stack frame utilization: Now the stack frame will only store last rays and next rays.
By alternating 2 arrays storing last ray and next ray, I don't need to store other rays.
</li>
<li>By combining these methods I managed to significantly reduce RT depth and 'stack' size,
While supporting nested object and objects both reflection and refraction rays on the same surface.
</li>
</ul>
<img src="./img.jpg"></img>
</ul>
<p>
</script>
<!!-------- YOU PROBABLY WANT TO CHANGE ANYTHING BELOW RIGHT NOW -------->
<script>
// CREATE THE HTML DOCUMENT
let flags = 0x0;
let vs = my_vertex_shader.innerHTML;
//* LOADING FRAGMENT SHADER
var client = new XMLHttpRequest();
client.open('GET', './shader.frag');
client.onloadend = function() {
fs = (client.responseText);
//* START EVERYTHING AFTER FRAGMENT SHADER IS DOWNLOADED.
gl_start(canvas1, vs, fs);
editor.getSession().setValue(fs);
editor.session.on('change', function(delta) {
if(typeof canvas1.setShaders === "function")
{
canvas1.setShaders(vs, editor.getSession().getValue());
setUniform('1i', 'flags', flags);
}
});
}
client.send();
document.body.innerHTML = [''
,'<font size=7 color=#909090>' + my_title.innerHTML
,'<img id="rtx" style="float:right;" src="./RTXon.svg" type="image/svg+xml"'
,' alt="Turn Ray Tracing On/OFF" title="Turn Ray Tracing On/OFF" height=60px /img>'
,'<div id="fps" style="font-size:25;float:right;margin-right:18px;"></div>'
,'<TABLE cellspacing=0 cellpadding=0><TR>'
,'<td><font color=red size=5><div id=errorMessage></div></font></td>'
,'</TR><TR>'
,'<table cellspacing=0>'
,'<tr>'
,'<td valign=top>'
,'<div id="ace" style="width:800px;height:2200px;"></div>'
,'</td><td valign=top>' + document.body.innerHTML
,'<input type="number" id="ins" style="margin-left:3px;font-size:24px;width:100px;height:45px" value="3" max="5" min = "1">'
,'<button id="bns" style="margin-left:5px;font-size:24px;width:180px;height:45px">Set Spheres</button>'
,'<input type="number" id="insamp" style="margin-left:3px;font-size:24px;width:100px;height:45px" value="1" max="4" min = "0.25" step="0.2">'
,'<button id="bnsamp" style="margin-left:5px;font-size:24px;width:200px;height:45px">Super Sampling</button>'
,'<div style=\'font-size:25px\'>' + my_instructions.innerHTML + '</div>' + '</td>'
,'</tr></table>'
,'</TR></TABLE>'
].join('');
bns.onclick=function(e){
if(ins.value>0 &&ins.value<=ns &&cns!=ins.value)
{
cns = ins.value;
fragmentShaderDefs = '\n const int cns = ' + cns + ';';
if(typeof canvas1.setShaders === "function")
canvas1.setShaders(vs, editor.getSession().getValue());
}
}
bnsamp.onclick=function(e){
let multiplier = insamp.value;
let w = parseInt(canvas1.style.width)*multiplier;
let h = parseInt(canvas1.style.height)*multiplier;
canvas1.height = h;
canvas1.width = w;
gl.viewport(0, 0, w, h);
gl.clearRect(0, 0, w, h);
}
// SET UP THE EDITABLE TEXT AREA ON THE LEFT SIDE.
ace.require("ace/ext/language_tools");
var editor = ace.edit("ace", {
mode:"ace/mode/glsl",
theme:"ace/theme/crimson_editor"
});
editor.setOptions({
enableBasicAutocompletion: true,
enableSnippets: true,
enableLiveAutocompletion: true,
fontSize: 14,
fontFamily: "monaco, menlo, ubuntu mono, consolas, source-code-pro",
fixedWidthGutter: true,
showGutter: true,
showPrintMargin: false,
});
editor.setAutoScrollEditorIntoView(true);
// REPARSE THE SHADER PROGRAM AFTER EVERY KEYSTROKE.
delete editor.KeyBinding;
let lastTime = Date.now();
let animating = true;
let ctrl = false, alt = false, shift = false, fpson = true, moving = false, over = false;
let mousedx = 0, mousedy = 0, mousedz = 0;
let cx = 1, cy = 1, sx = 0, sy = 0;
let mouselastX, mouselastY;
let lastClick = undefined;
let pause_resume = function(){
if(animating)
lastTime = Date.now();
else
startTime += Date.now() - lastTime;
animating = !animating;
};
canvas1.addEventListener('click',function(ev){
if(!(shift && alt) && lastClick&& Date.now()-lastClick<400)
pause_resume();
lastClick = Date.now();
//moving = false;
});
canvas1.addEventListener('mouseover', function(e){
over = true;
const mask = 0x8;
flags |= mask;
setUniform('1i', 'flags', flags);
});
canvas1.addEventListener('mousedown', function(e){
moving = true
mouselastX = mouselastY = undefined;
});
canvas1.addEventListener('mousemove', function(e){
if(!(mouselastX==undefined || mouselastY == undefined)&&moving){
mousedx -= (mouselastX - e.offsetX)/60;
mousedy -= (mouselastY - e.offsetY)/60;
cx = Math.cos(mousedx);
sx = Math.sin(mousedx);
cy = Math.cos(mousedy);
sy = Math.sin(mousedy);
setUniform('Matrix3fv', 'transformation', false, [cx, sy*sx, sx*cy, 0, cy, -sy, -sx, cx*sy, cx*cy]);
}
mouselastX = e.offsetX;
mouselastY = e.offsetY;
});
canvas1.addEventListener('mouseup', function(e){
moving = false;
});
canvas1.addEventListener('mouseout', function(e){
const mask = 0x8;
flags &= !mask;
setUniform('1i', 'flags', flags);
over = false;
moving = false;
});
canvas1.addEventListener('wheel', function(e){
mousedz += e.wheelDelta/600;
setUniform('1f', 'dFL', mousedz);
e.stopImmediatePropagation();
});
canvas1.scroll(function(e) {e.stopPropagation();});
rtx.style.cursor="pointer";
let rtswitch = function(){
alert('Ray Tracing is always on. See hw2 where rt can be toggled on/off.')
rtx.src='./RTXon.svg';
}
rtx.addEventListener('click', rtswitch);
var requestAnimationFrame = window.requestAnimationFrame ||
window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
let fpscounter = function(time){
if (start === undefined)
start = time;
else
fps.innerHTML = Math.round(10000/(time-start))/10 + ' fps';
start = time;
if(fpson)
;//requestAnimationFrame(fpscounter);
else{
start = undefined;
fps.innerHTML = '';
}
};
document.addEventListener('keydown',(e)=>{
if(e.code.startsWith('Shift'))
shift = true;
if(e.code.startsWith('Control'))
ctrl = true;
if(e.code.startsWith('Alt'))
alt = true;
else if(ctrl && alt && e.code == 'KeyT'){
const mask = 0x1;
flags = flags&!mask | (!(flags&mask)?mask:0);
setUniform('1i', 'flags', flags);
}
else if (ctrl &&e.code == 'KeyS'){
let a = document.createElement('a');
a.href = "data:text/plain,"+encodeURIComponent(editor.getSession().getValue());
a.download = 'shader.frag';
a.click();
}
else if(ctrl && alt&&e.code == 'KeyR')
rtswitch();
else if(ctrl && alt&&e.code == 'KeyN')
{
flags = 0;
moving = false;
mousedx = mousedy = mousedz = 0;
cx = Math.cos(mousedx);
sx = Math.sin(mousedx);
cy = Math.cos(mousedy);
sy = Math.sin(mousedy);
rtx.src='./RTXon.svg';
setUniform('Matrix3fv', 'transformation', false, [cx, sy*sx, sx*cy, 0, cy, -sy, -sx, cx*sy, cx*cy]);
setUniform('1f', 'dFL', mousedz);
setUniform('1i', 'flags', flags);
}
else if(ctrl && alt&&e.code == 'KeyP')
pause_resume();
else if(ctrl && alt&&e.code == 'KeyF')
if(!fpson)
{
fpson = true;
requestAnimationFrame(fpscounter);
}
else
fpson = false;
});
document.addEventListener('keyup',(e)=>{
if(e.code.startsWith('Control'))
ctrl = false;
if(e.code.startsWith('Alt'))
alt = false;
if(e.code.startsWith('Shift'))
shift = false;
});
let startTime = Date.now();
let lastFrameTime = 0;
function animate(gl) {
let uTime;
if(animating)
{
uTime = (Date.now() - startTime) / 1000;
setUniform('1f', 'uTime', uTime);
}
else
{
uTime = (lastTime - startTime) / 1000;
setUniform('1f', 'uTime', uTime);
}
setUniform('4f', 'Sph[4]', 0.5*Math.sin(uTime*1.),0.08*Math.sin(uTime *0.9),.5*Math.cos(uTime*1.),.12);
setUniform('4f', 'Sph[3]', .9*Math.sin(uTime*.4),0.,.9*Math.cos(uTime*.4),.25);
setUniform('4f', 'Sph[2]', .22*Math.sin(uTime*1.2),0.05,.22*Math.cos(uTime*1.2),.05);
setUniform('4f', 'Sph[0]', 0,0.05*Math.cos(uTime + 1.),.045*Math.cos(uTime),.15);
setUniform('4f', 'Sph[1]', 0,0.,0,.25);
}
let start;
requestAnimationFrame(fpscounter);
</script>
hw3/lib3.js
+207
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//////////////////////////////////////////////////////////////////////////////////////////
//
// THIS IS THE SUPPORT LIBRARY. YOU PROBABLY DON'T WANT TO CHANGE ANYTHING HERE JUST YET.
//
//////////////////////////////////////////////////////////////////////////////////////////
let fragmentShaderHeader = ['' // WHATEVER CODE WE WANT TO PREDEFINE FOR FRAGMENT SHADERS
, 'precision highp float;'
, 'float noise(vec3 point) { float r = 0.; for (int i=0;i<16;i++) {'
, ' vec3 D, p = point + mod(vec3(i,i/4,i/8) , vec3(4.0,2.0,2.0)) +'
, ' 1.7*sin(vec3(i,5*i,8*i)), C=floor(p), P=p-C-.5, A=abs(P);'
, ' C += mod(C.x+C.y+C.z,2.) * step(max(A.yzx,A.zxy),A) * sign(P);'
, ' D=34.*sin(987.*float(i)+876.*C+76.*C.yzx+765.*C.zxy);P=p-C-.5;'
, ' r+=sin(6.3*dot(P,fract(D)-.5))*pow(max(0.,1.-2.*dot(P,P)),4.);'
, '} return .5 * sin(r); }'
].join('\n');
let ns = 5, cns = 3;
fragmentShaderHeader+= 'const int ns = ' + ns + ';\n';
let fragmentShaderDefs = 'const int cns = ' + cns + ';\n';
let nfsh = fragmentShaderHeader.split('\n').length + 1; // NUMBER OF LINES OF CODE IN fragmentShaderHeader
let isFirefox = navigator.userAgent.indexOf('Firefox') > 0; // IS THIS THE FIREFOX BROWSER?
let errorMsg = '';
//
// Initialize a texture and load an image.
// When the image finished loading copy it into the texture.
//
function getBlob(data) {
let bytes = new Array(data.length);
for (let i = 0; i < data.length; i++) {
bytes[i] = data.charCodeAt(i);
}
return new Blob([new Uint8Array(bytes)]);
}
let texture = [], gl, program;
let textures = [];
let lock = false;
function loadTexture(gl, url, i) {
const level = 0;
const internalFormat = gl.RGBA;
const width = 1;
const height = 1;
const border = 0;
const srcFormat = gl.RGBA;
const srcType = gl.UNSIGNED_BYTE;
if (texture[i] == null)
{
texture[i] = gl.createTexture();
const pixel = new Uint8Array([0, 0, 255, 255]); // opaque blue
gl.activeTexture(gl.TEXTURE0+i);
gl.bindTexture(gl.TEXTURE_2D, texture[i]);
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
width, height, border, srcFormat, srcType,
pixel);
}
// Because images have to be downloaded over the internet
// they might take a moment until they are ready.
// Until then put a single pixel in the texture so we can
// use it immediately. When the image has finished downloading
// we'll update the texture with the contents of the image.
const image = new Image();
image.onload = function () {
gl.activeTexture(gl.TEXTURE0+i);
gl.bindTexture(gl.TEXTURE_2D, texture[i]);
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
srcFormat, srcType, image);
// WebGL1 has different requirements for power of 2 images
// vs non power of 2 images so check if the image is a
// power of 2 in both dimensions.
if (isPowerOf2(image.width) && isPowerOf2(image.height)) {
// Yes, it's a power of 2. Generate mips.
gl.generateMipmap(gl.TEXTURE_2D);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
} else {
// No, it's not a power of 2. Turn off mips and set
// wrapping to clamp to edge
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
}
};
image.src = url;
}
function isPowerOf2(value) {
return (value & (value - 1)) == 0;
}
function gl_start(canvas, vertexShader, fragmentShader) { // START WEBGL RUNNING IN A CANVAS
setTimeout(function () {
try {
canvas.gl = canvas.getContext('experimental-webgl'); // Make sure WebGl is supported. IT WOULD BE GREAT TO USE WEBGL2 INSTEAD.
} catch (e) { throw 'Sorry, your browser does not support WebGL.'; }
canvas.setShaders = function (vertexShader, fragmentShader) { // Add the vertex and fragment shaders:
gl = this.gl;
program = gl.createProgram(); // Create the WebGL program.
function addshader(type, src) { // Create and attach a WebGL shader.
function spacer(color, width, height) {
return '<table bgcolor=' + color +
' width=' + width +
' height=' + height + '><tr><td>&nbsp;</td></tr></table>';
}
errorMessage.innerHTML = '<br>';
// errorMarker.innerHTML = spacer('white', 1, 1) + '<font size=1 color=white>\u25B6</font>';
let shader = gl.createShader(type);
gl.shaderSource(shader, src);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
let msg = gl.getShaderInfoLog(shader);
console.log('Cannot compile shader:\n\n' + msg);
let a = msg.substring(6, msg.length);
let line = 0;
if (a.substring(0, 3) == ' 0:') {
a = a.substring(3, a.length);
line = parseInt(a) - nfsh;
editor.session.setAnnotations([{
row: line,
column: 0,
text: msg,
type: "error"
}]);
}
let j = a.indexOf(':');
a = 'line ' + (line+1) + a.substring(j, a.length);
if ((j = a.indexOf('\n')) > 0)
a = a.substring(0, j);
errorMessage.innerHTML = a;
}
else
editor.session.clearAnnotations();
gl.attachShader(program, shader);
};
addshader(gl.VERTEX_SHADER, vertexShader); // Add the vertex and fragment shaders.
addshader(gl.FRAGMENT_SHADER, fragmentShaderHeader +fragmentShaderDefs+ fragmentShader);
gl.linkProgram(program); // Link the program, report any errors.
if (!gl.getProgramParameter(program, gl.LINK_STATUS))
console.log('Could not link the shader program!');
gl.useProgram(program);
gl.program = program;
for(let i = 0; i < ns; ++i){
loadTexture(gl, './'+(i+1)+'.jpg', i); //Texture loading.
textures[i] = i;
}
gl.uniform1iv(gl.getUniformLocation(program, 'uSampler'), textures);
let cx = Math.cos(mousedx), cy = Math.cos(mousedy), sx = Math.sin(mousedx), sy = Math.sin(mousedy);
setUniform('Matrix3fv', 'transformation', false, [cx, sy*sx, sx*cy, 0, cy, -sy, -sx, cx*sy, cx*cy]);
let attribs = [
.05,.05,.1, .5,.5,1., 1.,.5,.5,20., 0., .0, 1.3,
.1,.05,.05, 1.,.5,.5, 1.,.5,.5,10., .3,1.,1.3, //
.1,.05,.05, .71,.71,.71, .71,.71,.71,10., 0.3,.0,1.5,
.1,.1,.1, .71,.71,.71, .71,.71,.71,10., 0.05,0., 1.,
.0,.0,.0, .0,.0,.0, .0,.0,.0,40., 0.,.85,1.5
]
var offset = 0;
for(let i = 0; i < ns; i++){
setUniform('3fv', 'Ambient['+i+']', attribs.slice(offset, offset += 3));
setUniform('3fv', 'Diffuse['+i+']', attribs.slice(offset, offset += 3));
setUniform('4fv', 'Specular['+i+']', attribs.slice(offset, offset += 4));
setUniform('1fv', 'ks['+i+']', attribs.slice(offset, offset += 1));
setUniform('1fv', 'kr['+i+']', attribs.slice(offset, offset += 1));
setUniform('1fv', 'kf['+i+']', attribs.slice(offset, offset += 1));
}
gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer()); // Create a square as a triangle strip
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array( // consisting of two triangles.
[-1, 1, 0, 1, 1, 0, -1, -1, 0, 1, -1, 0]), gl.STATIC_DRAW);
let aPos = gl.getAttribLocation(program, 'aPos'); // Set aPos attribute for each vertex.
gl.enableVertexAttribArray(aPos);
gl.vertexAttribPointer(aPos, 3, gl.FLOAT, false, 0, 0);
}
canvas.setShaders(vertexShader, fragmentShader); // Initialize everything,
setInterval(function () { // Start the animation loop.
gl = canvas.gl;
if (gl.startTime === undefined) // First time through,
gl.startTime = Date.now(); // record the start time.
animate(gl);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); // Render the square.
}, 30);
}, 100); // Wait 100 milliseconds after page has loaded before starting WebGL.
}
// THE animate() CALLBACK FUNCTION CAN BE REDEFINED IN index.html.
function animate() { }
function setUniform(type, name, a, b, c, d, e, f) {
if(gl)
{
let loc = gl.getUniformLocation(gl.program, name);
(gl['uniform' + type])(loc, a, b, c, d, e, f);
}
}
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hw3/pjsk.mp4
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hw3/shader.bak.frag
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vec3 foregroundColor = vec3(.0841, .5329, .9604);
vec3 groundColor = vec3(.2, .3, .5);
vec4 groundSpecular = vec4(.71, .71, .71, 10.);
uniform float uTime;// TIME, IN SECONDS
uniform int flags;
//FLAGS 0-TEX, 1-RT, 2-MOVED, 3-FLASH, 4-TEX_ROT, 5-CLOUD
uniform vec4 rot; //ROTATION VALUES USED TO CALCULATE TRANSFORMATION MATRIX
//rot=[cosx, sinx, cosy, siny], x, y BING ROTATED ANGLE
uniform float dFL; //DELTA on FOCAL LENGTH
uniform vec3 fDir;//Flash light direction
varying vec3 vPos;// -1 < vPos.x < +1
// -1 < vPos.y < +1
// vPos.z == 0
float fl=3.;//ORIGINAL FOCAL LENGTH
const float pi=3.14159265359;
const float _2pi=2.*pi;
const int n_ref=9; //2^(hits) + 1 because each hit now spawn 2 rays.
//const int ns=4; ns is added from .js
vec4 Sph[ns];
uniform sampler2D uSampler[ns];
vec3 Ambient[ns];
vec3 Diffuse[ns];
vec4 Specular[ns];
float ks[ns];
float kr[ns];
float kf[ns], kf_air = 1.000293;
int type[ns];//Nested objects
// 1-sphere, 2-compost sphere, 3-
struct Object{ //UPDATED SPHERE STRUCTURE THAT SUPPORTS TRANSPARENCY.(UNUSED)
vec4 Pos;
vec3 Ambient;
vec3 Diffuse;
vec4 Specular;
int textureid;
float ks, kt, kr;
};
struct RT{ //STACK FOR RECURSIVE RAY TRACING.
vec3 color;
float ks;
} ;
vec3 scolor = vec3(0,0,0); //Actually 2^n_ref
struct Ray{
vec3 V;
vec3 W;
float kf, cumulativeK;
} lastRay[n_ref/2];
bool modulo2(int n){
return n-2*(n/2) == 1;
}
bool getflag(int flag,int bit){
int shifted = flag / int(pow(2.,float(bit)));
return modulo2(shifted);
}
float clampv(float val,float l,float h){
return val<l?l:val>h?h:val;
}
void main(){
vec3 LDir=vec3(.5,.5,.5);
vec3 LCol=vec3(1.,1.,1.);
// SPHERE
Sph[3]=vec4(.9*sin(uTime*.4),0.,.9*cos(uTime*.4),.25);
Sph[2]=vec4(.22*sin(uTime*1.2),0.05,.22*cos(uTime*1.2),.02);
Sph[0]=vec4(.45*sin(uTime),0.05*cos(uTime + 1.),.45*cos(uTime),.1);
Sph[1]=vec4(0.,0.,0.,.15);
// SURFACE REFLECTANCE PROPERTIES, can be transferred from .js
Ambient[3]=vec3(.1,.1,.1);// r,g,b
Diffuse[3]=vec3(.71,.71,.71);// r,g,b
Specular[3]=vec4(.71,.71,.71,10.);// r,g,b,power
Ambient[2]=vec3(.1,.05,.05);// r,g,b
Diffuse[2]=vec3(.71,.71,.71);// r,g,b
Specular[2]=vec4(.71,.71,.71,10.);// r,g,b,power
Ambient[1]=vec3(.1,.05,.05);// r,g,b
Diffuse[1]=vec3(1.,.5,.5);// r,g,b
Specular[1]=vec4(1.,.5,.5,10.);// r,g,b,power
Ambient[0]=vec3(.05,.05,.1);// r,g,b
Diffuse[0]=vec3(.5,.5,1.);// r,g,b
Specular[0]=vec4(1.,.5,.5,20.);// r,g,b,power
ks[0] = 0.25;
ks[1] = 0.1;
ks[2] = 0.3;
ks[3] = 0.05;
kr[0] = 0.25;
kr[1] = 0.1;
kr[2] = 0.3;
kr[3] = 0.05;
kf[0] = 1.3;
kf[1] = 1.3; //Water
kf[2] = 1.5; //Glass
kf[3] = 1.; //Vacuum
float currKf = kf_air;
vec3 color=vec3(.2, .3, .5);
float ca=rot.x, sa = rot.y, cb=rot.z, sb=rot.w;
mat3 transformation, invTr;//Transformation matrix for viewpoint.
transformation[0] = vec3(ca, sb*sa, sa*cb);//because the matrices are all the same,
transformation[1] = vec3(0, cb, -sb);//We don't need to calculate it for every pixel
transformation[2] = vec3(-sa,ca*sb,ca*cb);//So, we get it from the CPU
invTr[0] = vec3(ca, 0, -sa);//it's inverse, to calculate texture mapping.
invTr[1] = vec3(sa*sb, cb, ca*sb);
invTr[2] = vec3(cb*sa, -sb, ca*cb);
vec3 trPos = transformation*((dFL+fl+1.)/(fl+1.))*vec3(vPos.xy, -1);
vec3 V0=transformation*vec3(0.,0.,fl+dFL), V = V0;
vec3 W=normalize(trPos-V);
bool rtxoff = getflag(flags, 1),
showtexture = !getflag(flags,0),
moved = getflag(flags,2);
int cnt_ref = n_ref;
float currentK = 1.;
for(int j=0;j<n_ref;j++)
{
if(j > 0){
Ray currR = lastRay[(j-1)/2];
currKf = currR.kf;
currentK = currR.cumulativeK;
if(currKf <= 0.0000001 || currentK <= 0.0000001)
continue; // We make it terminate w/ kf=0
V = currR.V;
W = currR.W;
}
float tMin=10000.;
int iMin = -1;
for(int i=0;i<cns;i++){
// SHIFT COORDINATES, SO THAT SPHERE IS AT (0,0,0)
vec3 Vp=V-Sph[i].xyz;
// SOLVE FOR QUADRATIC EQUATION IN t
float B=dot(W,Vp);
float C=dot(Vp,Vp)-Sph[i].w*Sph[i].w;
float D=B*B-C;
if(D>0.){
float t=-B-sqrt(D);
if(t >= 0.00001 && t < tMin){
tMin = t; // This is an optimization, we don't have to do lighting/tex
iMin = i; // for objects that are occuluded, which is expensive!
}
else if (t >= -0.00001){
t = -(t + 2.*B);
if(t < tMin){
tMin = t;
iMin = i;
}
}
}
}
// IF RAY HITS SPHERE
if(iMin >= 0){
float t = tMin;
vec3 S=V+t*W;
for(int i = 0; i < cns; ++ i)
if(i == iMin)
{
vec3 tex_sph = (S-Sph[i].xyz);
if(moved)
tex_sph=invTr*tex_sph;
float R=Sph[i].w;
float tex_x=acos(abs(tex_sph.x)/sqrt(R*R-tex_sph.y*tex_sph.y));
if(tex_sph.x>0.)
tex_x=pi-tex_x;
tex_x*=1.5708;//*Correct aspect ratio of texture 2:1 -> 2pir:2r
tex_x=tex_x+float(uTime);
float quo=float(int(tex_x/_2pi));
tex_x=tex_x/_2pi - quo;
vec3 texture_color;
if(showtexture)
texture_color=texture2D(uSampler[i],vec2(tex_x,((R-tex_sph.y)/(2.*R)))).xyz;
else texture_color = foregroundColor;
vec3 N=normalize(S-Sph[i].xyz);
vec3 realLDir=normalize(LDir-S);
color=(
Ambient[i]
+Diffuse[i]*max(0.,dot(N,realLDir))*LCol
)*texture_color
;
if(rtxoff || j >= n_ref/2) //if it's the last hit
{
color += sqrt(float(j+1)) * Specular[i].xyz*pow(max(0.,
dot(2.*dot(N,realLDir)*N-realLDir,-W)),Specular[i].w);
scolor += color * currentK;
}
else{
lastRay[2 * j + 1] = Ray(S, (-(2. * dot(N, W) * N - W)), currKf, currentK * ks[i]); //reflection
float ita = currKf/kf[i];
float c1 = dot(N, W);
float c2 = sqrt(1.-ita*ita*(1.-c1*c1));
lastRay[2 * j + 2] = Ray(S, normalize(ita*W + (ita*c1 - c2)*N), kf[i], currentK * kr[i]); //refraction
scolor += currentK*(1. - ks[i] - kr[i]) * color;//stack[j] = RT(color, currentK*(1. - ks[i] - kr[i]) * color;
}
break;
}
}
else {
float t = -(.2+V.y)/W.y;
float sx = V.x + t* W.x, sz = V.z + t * W.z;
if(t >= 0.&&abs(sx)<1.5 && abs(sz+.6)<3.)
{
vec3 S = vec3(sx, -.2, sz);
vec3 realLDir=normalize(LDir - S);
color=(
0.5 //ambient for ground
+0.5*max(0.,realLDir.y)*LCol //diffusion for ground
)*groundColor
;
// + SPECULAR COMPONENT GOES HERE
if(rtxoff || j == n_ref - 1)
{
color += sqrt(float(j+1))*groundSpecular.xyz* //specular for ground.
pow(max(0., dot(vec3(-realLDir.x, realLDir.y,-realLDir.z),-W)),groundSpecular.w);
//stack[j] = RT(color, currentK); //ks of ground is 0.15
scolor += currentK * color;
}
else
{
lastRay[2 * j + 1] = Ray(S, vec3(W.x, -W.y, W.z), currKf, currentK * 0.15); //reflection
//stack[j] = RT(color, currentK * (1.-0.15)); //ks of ground is 0.15
scolor += (currentK*.85)*color;
}
//lastRay[2 * j + 2] = Ray(S, vec3(0,0,0), 0.); //refraction
}
else{
if(j > 0)
{
// If the light bounces away! The color of it is calculated by
//stack[j] = RT(sqrt(float(j+1))*vec3(4.,4.,4)*pow(max(0.,dot(W, normalize(LDir - V))), 10.), currentK);
scolor += currentK * sqrt(float(j+1)*pow(max(0.,dot(W, normalize(LDir - V))), 10.)) * vec3(4.,4.,4);
//cnt_ref = j + 1;
}
//else //If the light hits the void in the first place, it's just black!
//cnt_ref = j;//j is always 0 in this case.
break; //The light is shooting into the void, let's stop RT.
}
}
if(rtxoff)
break;
}
if(!rtxoff)
{
color = scolor;
// color = vec3(0,0,0);
// //float currks = 1.;
// for(int i = 0; i < n_ref; ++i)
// {
// //if(i >= cnt_ref)//same trick to use bounded non-const on indexes
// // {
// // color += currks * stack[i - 1].color; //if there're less than n_ref rays, e.g. ray go to the void.
// // break;
// // }
// if(stack[i].ks <0.0000001)
// continue;
// color += stack[i].ks * stack[i].color;//currks *(1.-stack[i].ks) * stack[i].color;
// //currks *= stack[i].ks;
// }
// // if(n_ref == cnt_ref)
// // color += currks * stack[n_ref - 1].color;
}
gl_FragColor=vec4(sqrt(color),1.);
}
hw3/shader.bak2.frag
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vec3 foregroundColor = vec3(.0841, .5329, .9604);
vec3 groundColor = vec3(.2, .3, .5);
vec4 groundSpecular = vec4(.71, .71, .71, 10.);
uniform float uTime;// TIME, IN SECONDS
uniform int f_tex, f_rt, f_moved;
uniform vec4 rot; //ROTATION VALUES USED TO CALCULATE TRANSFORMATION MATRIX
uniform float dFL; //DELTA on FOCAL LENGTH
uniform mat3 transformation, invTr;
uniform vec3 Ambient[ns], Diffuse[ns];
uniform vec4 Specular[ns];
uniform float ks[ns], kr[ns], kf[ns];
uniform vec4 Sph[ns];
uniform sampler2D uSampler[ns];
const float kf_air = 1.000293;
varying vec3 vPos;
float fl=3.;//ORIGINAL FOCAL LENGTH
const float pi=3.14159265359;
const float _2pi=2.*pi;
const int n_ref=15; //2^(hits) - 1 because each hit now spawn 2 rays.
const int max_stack = (n_ref+1)/4;
vec3 scolor = vec3(0,0,0); //Actually 2^n_ref
struct Ray{
vec3 V;
vec3 W;
float kf, cumulativeK;
} stack1[max_stack], stack2[max_stack];
bool modulo2(int n){
return n-2*(n/2) == 1;
}
vec3 getRefraction(vec3 N, vec3 W, float nextkr, float eta, float c1){
float c2 = (1.-eta*eta*(1.-c1*c1));
c2 = sqrt(abs(c2));
return normalize(eta*W + (eta*c1 - c2)*N);
}
void main(){
vec3 LDir=vec3(.5,.5,.5);
vec3 LCol=vec3(1.,1.,1.);
float currKf = kf_air;
vec3 color=vec3(.2, .3, .5);
vec3 trPos = transformation*((dFL+fl+1.)/(fl+1.))*vec3(vPos.xy, -1);
vec3 V0=transformation*vec3(0.,0.,fl+dFL), V = V0;
vec3 W=(trPos-V);
bool rtxoff = false, showtexture = true, moved = false;
float currentK = 1.;
int curr_ptr = 0, curr_top = 0, next_top = 0;
bool final = false, stackswap = false;
for(int j=0;j<n_ref;j++)
{
for(int curr = 0; curr < max_stack; ++curr){
if(curr == curr_ptr){
bool outward = false;
bool skip = false;
if(j > 0){
Ray currR;
if(stackswap)
currR = stack1[curr];
else
currR = stack2[curr];
currKf = currR.kf;
currentK = currR.cumulativeK;
if(currKf <= 0.001 || currentK <= 0.001)
skip = true;
V = currR.V;
W = currR.W;
}
else
W = normalize(W);
if(!skip){
float tMin=10000.;
int iMin = -1;
for(int i=0;i<cns;i++){
vec3 Vp=V-Sph[i].xyz;
float B=dot(W,Vp);
float C=dot(Vp,Vp)-Sph[i].w*Sph[i].w;
float D=B*B-C;
if(D>0.){
float t=-B-sqrt(D);
if(t >= 0.01 && t < tMin){
tMin = t; // This is an optimization, we don't have to do lighting/tex
iMin = i; // for objects that are occuluded, which is expensive!
outward = false;
}
else if (t >= -0.01 && t <0.01){
t = -(t + 2.*B);
if(t > 0.01 && t < tMin){
tMin = t;
iMin = i;
outward = true;
}
}
}
}
if(iMin >= 0){
float t = tMin;
vec3 S=V+t*W;
for(int i = 0; i < cns; ++ i)
if(i == iMin)
{
vec3 texture_color;
if(showtexture)
{
vec3 tex_sph = (S-Sph[i].xyz);
if(moved)
;//tex_sph=invTr*tex_sph;
float R=Sph[i].w;
float tex_x=acos(abs(tex_sph.x)/sqrt(R*R-tex_sph.y*tex_sph.y));
if(tex_sph.x>0.)
tex_x=pi-tex_x;
tex_x*=1.5708;//*Correct aspect ratio of texture 2:1 -> 2pir:2r
tex_x=tex_x+float(uTime);
float quo=float(int(tex_x/_2pi));
tex_x=tex_x/_2pi - quo;
texture_color=texture2D(uSampler[i],vec2(tex_x,((R-tex_sph.y)/(2.*R)))).xyz;
}
else texture_color = foregroundColor;
vec3 N=normalize(S-Sph[i].xyz);
vec3 realLDir=normalize(LDir-S);
if(outward){
float c1 = dot(N, W);
if(c1 > 0.)
{
c1 = -c1;
N = -N;
outward = true;
}
else outward = false;
color=(Ambient[i]+Diffuse[i]*max(0.,dot(N,realLDir))*LCol)*texture_color;
if(rtxoff || final) //if it's the last hit
{
color += Specular[i].xyz*pow(max(0.,dot(-2.*c1*N-realLDir,realLDir)),Specular[i].w);
scolor += color * currentK;
}
else{
float eta =kf[i]/currKf;
if(outward) eta = 1./eta;
float nextks = currentK * ks[i], nextkr = currentK * kr[i];
bool refl = nextks > 0.001, refr = nextkr > 0.001;
if(refl || refr)
for(int k = 0; k < max_stack; ++k)
if(k == next_top){
if(stackswap){
if(refl)
{
stack2[k] = Ray(S, getRefraction(N, W, nextkr, eta, c1), currKf, nextks); //reflection
currentK -= nextks;
next_top ++;
}
if(refr)
{
if(refl)
stack2[k+1] = Ray(S, getRefraction(N, W, nextkr, eta, c1), kf[i], nextkr); //refraction
else
stack2[k] = Ray(S, getRefraction(N, W, nextkr, eta, c1), kf[i], nextkr); //refraction
currentK -= nextkr;
next_top ++;
}
}else{
if(refl)
{
stack1[k] = Ray(S, (-(2. * c1 * N - W)), currKf, nextks); //reflection
currentK -= nextks;
next_top ++;
}
if(refr)
{
if(refl)
stack1[k+1] = Ray(S, getRefraction(N, W, nextkr, eta, c1), kf[i], nextkr); //refraction
else
stack1[k] = Ray(S, getRefraction(N, W, nextkr, eta, c1), kf[i], nextkr); //refraction
currentK -= nextkr;
next_top ++;
}
}
break;
}
scolor += currentK * color;
}
}
else{
float c1 = (dot(N, W));
float ita = kf_air/currKf;
if(c1<0.)
{
c1 = -c1;
N = - N;
}
float c2 = (1.-ita*ita*(1.-c1*c1));
if(c2 >= 0.)
c2 = sqrt(c2);
else c2 = -sqrt(-c2);
for(int k = 0; k < max_stack; ++k)
if(k == next_top){
if(stackswap)
{
//stack2[k] = Ray(S, ((2. * c1 * N - W)), currKf, currentK*ks[i]); //reflection
//if(c2>=0.)
{
stack2[k] = Ray(S, normalize(ita*W + (ita*c1 - c2)*N), kf_air, currentK*kr[i]); //refraction
next_top ++;
}
}else{
//stack1[k] = Ray(S, ((2. * c1 * N - W)), currKf, currentK*ks[i]); //reflection
//if(c2 >= 0.)
{
stack1[k] = Ray(S, normalize(ita*W + (ita*c1 - c2)*N), kf_air, currentK*kr[i]); //refraction
next_top ++;
}
}
// next_top ++;
break;
}
}
break;
}
}
else {
float t = -(.2+V.y)/W.y;
float sx = V.x + t* W.x, sz = V.z + t * W.z;
if(t >= 0. && abs(sx) < 1.5 && abs(sz) < 3.)
{
vec3 S = vec3(sx, -.2, sz);
vec3 realLDir=normalize(LDir - S);
color=(0.5+0.5*max(0.,realLDir.y)*LCol)*texture2D(uSampler[4],vec2((sx+2.)/3., (sz+1.)/6.)).xyz;
if(rtxoff || final&&abs(sx)<1.5 && abs(sz+.6)<3.)
{
color += groundSpecular.xyz* //specular for ground.
pow(max(0., dot(vec3(-realLDir.x, realLDir.y,-realLDir.z),-W)),groundSpecular.w);
scolor += currentK * color;
}
else
{
for(int k = 0; k < max_stack; ++k)
if(k == next_top){
if(stackswap)
stack2[k] = Ray(S, vec3(W.x, -W.y, W.z), kf_air, currentK * 0.15); //reflection
else
stack1[k] = Ray(S, vec3(W.x, -W.y, W.z), kf_air, currentK * 0.15); //reflection
next_top ++;
break;
}
scolor += (currentK*.85)*color;
}
}
else{
if(j > 0)
scolor += currentK * pow(max(0.,dot(W, normalize(LDir - V))), 10.) * vec3(1.,1.,1.);
}
}
}
if(++curr_ptr >= curr_top){
curr_top = next_top;
curr_ptr = 0;
if(next_top * 2 > max_stack)
final = true;
stackswap = !stackswap;
}
break;
}
}
}
gl_FragColor=vec4(sqrt(scolor),1.);
}
hw3/shader.frag
+237
View File
@@ -0,0 +1,237 @@
#define _DEBUG_BREAK {gl_FragColor=vec4(1,0,0,1); return;}
#define REFRACTION normalize(c2 >= 0.? (eta*W + (eta*c1 - sqrt(c2))*N) : ((W + c1*N)/sqrt(1.-c1*c1)))
vec3 foregroundColor = vec3(.0841, .5329, .9604);
vec3 groundColor = vec3(.2, .3, .5);
vec4 groundSpecular = vec4(.71, .71, .71, 10.);
uniform float uTime;// TIME, IN SECONDS
uniform int f_tex, f_rt, f_moved;
uniform float dFL; //DELTA on FOCAL LENGTH
uniform mat3 transformation, invTr;
uniform vec3 Ambient[ns], Diffuse[ns];
uniform vec4 Specular[ns];
uniform float ks[ns], kr[ns], kf[ns];
uniform vec4 Sph[ns];
uniform sampler2D uSampler[ns];
const float kf_air = 1.000293;
varying vec3 vPos;
float fl=3.;//ORIGINAL FOCAL LENGTH
const float pi=3.14159265359;
const float _2pi=2.*pi;
/***********PLEASE DO INCREASE n_ref(RT DEPTH) FOR BETTER RESULTS************/
/*---->*/const int n_ref=31; //2^n-1 because each hit now spawn at most 2 rays.
/**BUT BE CAUTIOUS IF YOU DON'T HAVE A DECENT GRAPHICS CARD (below GTX 950M)**/
const int max_stack = (n_ref+1)/4;
vec3 scolor = vec3(0,0,0); //Actually 2^n_ref
struct Ray{
vec3 V;
vec3 W;
float kf, cumulativeK;
} stack1[max_stack], stack2[max_stack];
bool modulo2(int n){
return n-2*(n/2) == 1;
}
vec2 getTextCoord(vec3 tex_sph, float R){
float tex_x=atan(tex_sph.x,tex_sph.z)/_2pi + 0.5;//*Correct aspect ratio of texture 2:1 -> 2pir:2r
tex_x=fract(tex_x+uTime/20.);
return vec2(tex_x,-asin(tex_sph.y/R)/pi + 0.5);
}
void main(){
vec3 LDir=vec3(.5,.5,.5);
vec3 LCol=vec3(1.,1.,1.);
float currKf = kf_air;
vec3 color=vec3(.2, .3, .5);
vec3 trPos = transformation*((dFL+fl+1.)/(fl+1.))*vec3(vPos.xy, -1);
vec3 V0=transformation*vec3(0.,0.,fl+dFL), V = V0;
vec3 W=(trPos-V);
bool rtxoff = false, showtexture = true, moved = false;
float currentK = 1.;
int curr_ptr = 0, curr_top = 0, next_top = 0;
bool final = false, stackswap = false, stop = false;
for(int j=0;j<n_ref;j++)
{
for(int curr = 0; curr < max_stack; ++curr){
if(curr == curr_ptr){
bool skip = false;
if(j > 0){
Ray currR;
if(stackswap)
currR = stack1[curr];
else
currR = stack2[curr];
currKf = currR.kf;
currentK = currR.cumulativeK;
if(currKf <= 0.001 || currentK <= 0.001)
skip = true;
V = currR.V;
W = currR.W;
}
else
W = normalize(W);
if(!skip){
float tMin=10000.;
int iMin = -1;
for(int i=0;i<cns;i++){
vec3 Vp=V-Sph[i].xyz;
float B=dot(W,Vp);
float C=dot(Vp,Vp)-Sph[i].w*Sph[i].w;
float D=B*B-C;
if(D>0.){
float t=-B-sqrt(D);
if(t >= 0.01 && t < tMin){
tMin = t; // This is an optimization, we don't have to do lighting/tex
iMin = i; // for objects that are occuluded, which is expensive!
}
else if (t >= -0.01 && t <0.01){
t = -(t + 2.*B);
if(t > 0.01 && t < tMin){
tMin = t;
iMin = i;
}
}
}
}
if(iMin >= 0){
float t = tMin;
vec3 S=V+t*W;
for(int i = 0; i < cns; ++ i)
if(i == iMin)
{
vec3 texture_color;
if(showtexture)
{
vec3 tex_sph = (S-Sph[i].xyz);
texture_color=texture2D(uSampler[i],getTextCoord(tex_sph, Sph[i].w)).xyz;
}
else texture_color = foregroundColor;
vec3 N=normalize(S-Sph[i].xyz);
vec3 realLDir=normalize(LDir-S);
float c1 =dot(N, W);
float eta, nextkf;
if(c1<0.){
color=(Ambient[i]+Diffuse[i]*max(0.,dot(N,realLDir))*LCol)*texture_color;
if(rtxoff || final) //if it's the last hit
{
color += Specular[i].xyz*pow(max(0.,
dot(-2.*c1*N-realLDir,realLDir)),Specular[i].w);
scolor += color * currentK;
break;
}
else{
c1 = -c1;
eta = currKf/kf[i];
nextkf = kf[i];
}
}
else{
N = -N;
eta = currKf/kf_air;
nextkf = kf_air;
color = Ambient[i];
}
float c2 = (1.-eta*eta*(1.-c1*c1));
float nextks = currentK * ks[i], nextkr = currentK * kr[i];
bool refl = nextks > 0.01, refr = nextkr > 0.01;
if(refl || refr)
for(int k = 0; k < max_stack; ++k)
if(k == next_top){
if(stackswap){
if(refl)
{
stack2[k] = Ray(S, 2. * c1 * N + W, currKf, nextks); //reflection
currentK -= nextks;
next_top ++;
}
if(refr)
{
if(refl)
stack2[k+1] = Ray(S, REFRACTION, nextkf, nextkr); //refraction
else
stack2[k] = Ray(S, REFRACTION, nextkf, nextkr); //refraction
currentK -= nextkr;
next_top ++;
}
}else{
if(refl)
{ //remember, c1 = -NW now
stack1[k] = Ray(S, 2. * c1 * N + W, currKf, nextks); //reflection
currentK -= nextks;
next_top ++;
}
if(refr)
{
if(refl)
stack1[k+1] = Ray(S, REFRACTION, nextkf, nextkr); //refraction
else
stack1[k] = Ray(S, REFRACTION, nextkf, nextkr); //refraction
currentK -= nextkr;
next_top ++;
}
}
break;
}
scolor += color * currentK;
break;
}
}
else {
float t = -(.2+V.y)/W.y;
float sx = V.x + t* W.x, sz = V.z + t * W.z;
if(t >= 0. && abs(sx) < 1.5 && abs(sz) < 3.)
{
vec3 S = vec3(sx, -.2, sz);
vec3 realLDir=normalize(LDir - S);
color=(0.5+0.5*max(0.,realLDir.y)*LCol)*texture2D(uSampler[4],vec2((sx+1.4)/3., (sz+1.5)/4.)).xyz;
if(rtxoff || final&&abs(sx)<1.5 && abs(sz+.6)<3.)
{
color += groundSpecular.xyz* //specular for ground.
pow(max(0., dot(vec3(-realLDir.x, realLDir.y,-realLDir.z),-W)),groundSpecular.w);
scolor += currentK * color;
}
else
{
for(int k = 0; k < max_stack; ++k)
if(k == next_top){
if(stackswap)
stack2[k] = Ray(S, vec3(W.x, -W.y, W.z), kf_air, currentK * 0.15); //reflection
else
stack1[k] = Ray(S, vec3(W.x, -W.y, W.z), kf_air, currentK * 0.15); //reflection
next_top ++;
break;
}
scolor += (currentK*.85)*color;
}
}
else{
if(j > 0)
scolor += currentK * (pow(max(0.,dot(W, normalize(LDir - V))), 10.) * vec3(3.,3.,3.) + foregroundColor*0.1);
else scolor = foregroundColor*0.6;
}
}
}
if(++curr_ptr >= curr_top){
if(next_top <= 0)
stop = true;
if(next_top * 2 > max_stack)
final = true;
curr_top = next_top;
next_top = 0;
curr_ptr = 0;
stackswap = !stackswap;
}
break;
}
}
if(stop)
break;
}
gl_FragColor=vec4(sqrt(scolor),1.);
}