Friday, March 26th, 2010
Dynamic lighting effects in Canvas
<>p>Jonas Wagner has a perfect Friday fun demo that normal mapping and phong shading in JavaScript using Canvas. Your mouse cursor becomes the light source that dynamically lights up a 3D object:
Jonas discusses how his code works:
The 3D effect is basically created using 2 textures. One contains the color of each pixel and the other the surface normal. The color image is rendered using only indirect lighting (ambient occlusion in that case). The direct light is then calculated in real time using phong shading without the diffuse part. For a more accurate description, read the source. ;)
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4.6 rating from 32 votes
Awesome. I like how simple the code is.
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I see a clear roadmap for web-based image editors :)
I like a good phong.
Looks like the beginning of a webgl software emulation layer for canvas2d to me.