About ray differentials of primary rays

Practical and theoretical implementation discussion.
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shiqiu1105
Posts: 138
Joined: Sun May 27, 2012 4:42 pm

About ray differentials of primary rays

Post by shiqiu1105 » Tue Dec 02, 2014 8:31 pm

Hi,

I am writing to ask about the ray differentials for primary rays if they don't hit anything.
I still need the differentials info to sample environment map, but how should the differentials be calculated?

Thanks

beason
Posts: 52
Joined: Sat Dec 10, 2011 1:58 am
Location: Los Angeles, CA

Re: About ray differentials of primary rays

Post by beason » Tue Dec 02, 2014 8:56 pm

Pixel solid angle, or a fraction thereof?

shiqiu1105
Posts: 138
Joined: Sun May 27, 2012 4:42 pm

Re: About ray differentials of primary rays

Post by shiqiu1105 » Thu Dec 04, 2014 1:21 am

Maybe, not sure how the math works.

I think it should depend on the fov, film resolution.

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