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February 29th, 2008
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#1 (permalink) | |
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Moderator
Join Date: Aug 2004
Location: Beantown
Age: 29
Posts: 4,441
Name: Andrew Lynn   |
This is odd...
With apologies to Jeff Patton, see attachments (Max08 file). I was messing around with an oversimplified version of a space I'm working on to experiment with some settings and exposure control, and I wanted to bounce a caustic off the floor. Used the Satin Varnished Wood preset, and started getting this sort of crap:
Quote:
Long story short, after some experimenting, for different values of the reflection glossiness on the wood floor: 0.51 and over produce the expected effect 0.5 and under produce the error WTH is so special about glossiness=0.5? I would think that any reflection glossiness should be able to produce a caustic of whatever blurriness. |
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March 1st, 2008
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#2 (permalink) |
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Member
Join Date: Sep 2007
Location: Goteborg
Posts: 88
Name: Robert Karlsson  |
Re: This is odd...
Have you tried enabling the photon radius setting for the sun? Focus the beam of photons on the window. However, that does not explain your problem. Have you set the geometry to receive/generate caustics where necessary?
Robert |
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March 3rd, 2008
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#3 (permalink) | |
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Member
Join Date: May 2006
Location: Eskilstuna
Posts: 70
Name: Håkan Andersson |
Re: This is odd...
Correct; this is by design (although you could question the design
 )Photons either reflect "glossily" or "specularly". Only "specular" photons contribute to caustics, only "diffuse" and "glossy" photons contribute to global illumination. The A&D material treats any glossiness above 0.5 as "specular" for photons, and anything less as "glossy". Hence, it will not propagate caustics for glossiness 0.5 r less. /Z Quote:
__________________
mentalraytips.blogspot.com - mr Zap Andersson - a completely mental shader guy |
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