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Questions tagged [spherical-harmonics]

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Baked anisotropic filtering using spherical harmonics

I want to learn is it good or bad idea. Let's assume video RAM is not a problem. For source texture create a texture of texels: spherical functions. Spherical functions defined by small arrays of ...
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1answer
281 views

Advantages of spherical harmonics over baked vertex lighting?

My question is about spherical harmonic lightning, in the context of computing the coefficients with an expensive GI algorithm and passing them to the vertex shader Another way is to just use an ...
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Lighting ramps compressed to zonal harmonics

Let's say I have a lighting lobe represented as a ndotl ramp texture, how do I compress it into a zonal harmonic?
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2answers
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Spherical Harmonics Diffuse CubeMap. How to get coefficients?

envmap.pdf | An Efficient Representation for Irradiance Environment Maps Spherical Harmonics and applications in real time graphics I am using Spherical Harmonics to turn reflective(mirror like) cube ...
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1answer
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Multiplication of SH coefficient sets representing occlusion and color

Currently I got interested in implementation of Precomputed Radiance Transfer. I decided that occlusion representation (which is not trivial to compute) would be precomputed as CPU raytracing and ...
5
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1answer
307 views

Why is spherical harmonics used in low frequency graphics data instead of a spherical Fourier transform?

I'm curious why spherical harmonics are commonly used in real time graphics instead of a spherical Fourier transform. I get that spherical harmonics are in a sort of frequency space (like FT is) so ...
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3answers
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What are Spherical Harmonics & Light Probes?

What are Spherical Harmonics & Light Probes? How useful are they in computer graphics? What exactly do they do? I've heard the word spherical harmonics & Light Probes everywhere, from siggraph ...
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1answer
305 views

Legendre Polynomial equation in Spherical Harmonics

I recently started to read about spherical harmonics. I have a question about this spherical harmonics basis function equation which is mentioned in this StupidSH article: What are those lm() and Re()...