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Re: [Manta] missing 1/pi in area light code?


Chronological Thread 
  • From: Austin Robison <arobison@cs.utah.edu>
  • To: Solomon Boulos <boulos@cs.utah.edu>
  • Cc: Peter Shirley <shirley@cs.utah.edu>, "manta@sci.utah.edu" <manta@sci.utah.edu>
  • Subject: Re: [Manta] missing 1/pi in area light code?
  • Date: Tue, 25 Dec 2007 15:12:13 -0500
I remember from the rtsl paper that all of Manta's internal diffuse materials are missing that 1/pi.

~Austin

On Dec 25, 2007, at 2:57 PM, Solomon Boulos <boulos@cs.utah.edu> wrote:

I disagree. Look at parallelogram in combination with arealight. Also lambertian happens to not include a division by pi but this is a separate issue.




On Dec 24, 2007, at 9:51 PM, Peter Shirley <shirley@cs.utah.edu> wrote:

I think the color computed in area light is missing a (1/pi) I think. The test is a reflectance 1.0 sphere
tangent to an area source with color 1.0. This is too bright by about 3x and the code seems to be
missing that as well.  Anyone agree?

Thanks.

Pete



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