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bill
2021-02-24 14:35:12 +08:00
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@@ -58,25 +58,18 @@ Solar RTX
<p>
<i style="font-size:25px;">Here is how it works:</i>
<ul>
<li>First, I added <a href="http://planetpixelemporium.com/download/download.php?earthmap1k.jpg">texture</a> to the sphere. The code to load the texture is from
<a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Tutorial/Using_textures_in_WebGL">here</a>. Please wait a sec for the texture to download.</li>
<li>Then, I mapped the 3D sphere surface to the rectangular 2D texture picture. </li>
<li>I also make it look like it's rotating by adding uTime to the offset of the texture and reset the offset to 0 whenever it exceeds
the width of the texture.</li>
<li>I used Perlin Noise to generate fake clouds.</li>
<li> I modified the lighting so that the light source won't move with the sphere and
the lighting will change when the sphere moves. I also added specular lights to make it shinier.</li>
<li> I tried to add some 'soft shadow' to it. I used a mix of methods inspired by Ambient Occlusion and Ray Tracing.<br>
<li>First, I started with what I've already done in homework 1. Which already included complete Phong shading with
Specular light and much more (spherical texture mapping, simple interactions, improved UI/shader editor).
</li>
<li> I then merged the code from hw2 and added texture to each sphere.</li>
<li> I modified the ray tracing algorithm so that when hitting an object, instead of returning color calculated from
Phong model:<br>
<ul>
<li>The Ambient lights and diffusion lights are reduced with respect to the distance between the background point and the sphere.</li>
<li>The specular light of the background wall is eliminated and the diffusion factor is reduced when the ray shooting from the background point
towards the light source or from the background point towards the camera position intersect with the sphere.</li>
<li>I recursively traced the light reflected and refract from the object.</li>
<li></li>
</ul>
<li>I added basic interactions such as press ctrl + 't' key to hide/show texture, click on the above canvas to pause/unpause animations.
Just a proof of concept.</li>
<li>Finally, I made some small changes like changing R over time and refined the UI a little bit. I used
<a href="https://ace.c9.io">Ace</a> for code highlighting and autocompletion on the edit panel.</li>
<li>Comments begin with '//*' are added by me.</li>
<li></li>
<li>Finally, I used super sampling via doubling the render dimensions of the canvas to reduce aliasing.</li>
<li>Repo on <a href="https://github.com/sunyinqi0508/graphics_hw1">Github</a>.</li>
</li>
</ul>