Questions tagged [spherical-harmonics]

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Spherical harmonics

I'm currently trying to implement a GI system for diffuse lighting and wanted to do so in spherical harmonics. Now i have read what else i could find and i know the general idea of how to get from ...
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Is using Spherical Harmonics still viable as a technique nowadays?

I've been implementing spherical harmonics in my Engine for learning purpose. I was wondering if Spherical Harmonics are still used in modern engine or if they moved on to the more simple cubemaps or ...
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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 ...
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0answers
193 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 ...
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1answer
5k 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?
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1answer
643 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. ...
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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 ...
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1answer
857 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 ...
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2answers
3k 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 ...
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1answer
222 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 ...
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2answers
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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. The paper describes a scene pre-processing step ...
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6answers
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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 graphics....