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0
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0answers
60 views

How to calculate spherical harmonic coefficients for indirect diffuse?

After reading the article "An Efficient Representation for Irradiance Environment Maps", I'm a bit confused as how to calculate the spherical harmonic coefficients. I'd like to generate these ...
1
vote
0answers
37 views

Spherical Harmonics Normal

I'm trying to generate irradiance map with spherical harmonics coefficients. I have a function SH(l, m, N) that evaluate the basis function for specified band (l, m) and normalized direction N. The ...
3
votes
1answer
877 views

Irradiance cubemap to spherical harmonics conversion

What are advantages of using spherical harmonics instead of irradiance cubemap? Are there any common used methods for conversion?
3
votes
1answer
231 views

Spherical harmonics lighting evaluation

The following is taken from my current understanding of spherical harmonics. There may be errors involved which solve my question if they're resolved, so please notify me if I misunderstood something. ...
7
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2answers
274 views

Reducing Spherical Harmonic Ringing

I've generated some 2nd order SH light-probes from cube-maps in my scene and I was surprised how strong artifacts are around the back of the dominant lights. I switched to a Lambert source plus ...
5
votes
1answer
347 views

Spherical harmonics lighting interpolation

I want to use hardware filtering to smooth out colors in texels of a texture when I'm accessing texels at coordinates that are not directly at the center of the texel, the catch being that the texels ...
6
votes
2answers
751 views

Spherical harmonics lighting - what does it accomplish?

From my understanding, spherical harmonics are sometimes used to approximate certain aspects of lighting (depending on the application). For example, it seems like you can approximate the diffuse ...
-1
votes
1answer
157 views

Smooth Ramp to zonal harmonics

I have written in blitz3D some code to generate arbitrary 2D lighting lookup textures and I'm looking for a way to compress them. The idea is that they look rather smooth and low frequency, there must ...
4
votes
2answers
753 views

How Do I Raycast for a Spherical Harmonic Shader Using the iOS GPU?

I am beginning an Spherical Harmonics shader project for an iOS app I am writing. I have begun by reading this excellent in-depth paper on the subject (PDF) - http://bit.ly/aQmax3. The paper ...
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6answers
823 views

Using spherical harmonics to build complex sound scapes

I was having a discussion at work today on how to improve room acoustic modelling. It was suggested that very little work appears to have been done on the subject yet tonnes has been done in ...