   Spherical gaussian
  So the line in the paper I'm implementing says the following:"Each level of the mip-map is computed by convolving the environmentmap with a spherical Gaussian that has twice the standard deviation of the previous level"So my question here is, what is a spherical gaussian? I need some kind of formulation in function of theta and phi.   
Quote:Original post by ZarathustraSo the line in the paper I'm implementing says the following:"Each level of the mip-map is computed by convolving the environmentmap with a spherical Gaussian that has twice the standard deviation of the previous level"So my question here is, what is a spherical gaussian? I need some kind of formulation in function of theta and phi.The angular component is probably constant.  That is, there is no dependence on angles "theta" and "phi".Rather, the spherical gaussian is probably definedF(r, theta, phi) = A*exp(-r^2/sigma^2)where r is radial distance.   