Importance Sampling – Environment map

I have implemented importance sampling for the enviroment map which really helps in reducing the variance which manifest itself as noise is the rendered image.

Samples are drawn according the radiance of the pixels

A comparison between two images rendered with the same amount of samples

References:

http://www.cs.virginia.edu/~gfx/courses/2007/ImageSynthesis/assignments/sampling.html

Physically Based Rendering, Second Edition: From Theory To Implementation

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