• Advertisement
Sign in to follow this  

How to find PDF to use with importance sampling

This topic is 780 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts


I am not certain, but I think the formula in the link you refer to is a reformulation of the Phong NDF to account for light conservation (the formula used for normalized Phong specular BRDF).

Here is some material that might help you answer your question.



In the 1977 paper Models of Light Reflection for Computer Synthetized Pictures, James F. Blinn talks about several possible Facet Distribution Functions that can be chosen to build a Torrance-Sparow model of a specular BRDF:



In the Global Illumination Compendium, Philip Dutré recalls the mathematical background of integration over the hemisphere:



A derivation of the normalization factor for the Phong NDF has been given on Fabian Giesen site:





Share this post

Link to post
Share on other sites
Sign in to follow this  

  • Advertisement