# Tagged Questions

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213 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 ...
47 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 ...
2k 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?
335 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. ...
398 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 ...
472 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 ...
1k 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 ...
179 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 ...