Problem with raytraced reflections and radiosity

Rick Eloy · November 11th, 2004

Hey, m8s! This maybe a dummy question, but I ran into it just today...
I have a wood material with raytraced reflections. The problem is that when the reflection is off, the rendering comes out just fine. When I turn it on, it blows all raytraced reflections in the scene. Has anyone had the same experience?
PS: Using Max 6 with sp1

abicalho · November 11th, 2004

Do you have a background color? If so, try setting it black.

Alexander

Rick Eloy · November 12th, 2004

Hum....worked. But why?

abicalho · November 12th, 2004

When the reflection hits the max depth, it then uses the background color instead of continuing the ray. With exposure control, the background color has a lot of energy because it needs to be inverted and considered in Floating point. This causes the problems you're seeing.

Ideally one should not use a background image or color, but instead model a billboard and apply a color/bitmap to it.

Alexander

November 11th, 2004	#1 (permalink)
Rick Eloy Moderator Join Date: Apr 2002 Location: São Paulo, Brasil Age: 31 Posts: 2,383 Name: Ricardo Eloy	Problem with raytraced reflections and radiosity Hey, m8s! This maybe a dummy question, but I ran into it just today... I have a wood material with raytraced reflections. The problem is that when the reflection is off, the rendering comes out just fine. When I turn it on, it blows all raytraced reflections in the scene. Has anyone had the same experience? PS: Using Max 6 with sp1 __________________ Rick Eloy reb digital - Really, I'm doing it for the kids...

November 11th, 2004	#2 (permalink)
abicalho Veteran Member Join Date: Dec 2001 Location: San Francisco Age: 35 Posts: 643 Name: Alex Bicalho	Re: Problem with raytraced reflections and radiosity Do you have a background color? If so, try setting it black. Alexander

November 12th, 2004	#3 (permalink)
Rick Eloy Moderator Join Date: Apr 2002 Location: São Paulo, Brasil Age: 31 Posts: 2,383 Name: Ricardo Eloy	Re: Problem with raytraced reflections and radiosity Hum....worked. But why? __________________ Rick Eloy reb digital - Really, I'm doing it for the kids...

November 12th, 2004	#4 (permalink)
abicalho Veteran Member Join Date: Dec 2001 Location: San Francisco Age: 35 Posts: 643 Name: Alex Bicalho	Re: Problem with raytraced reflections and radiosity When the reflection hits the max depth, it then uses the background color instead of continuing the ray. With exposure control, the background color has a lot of energy because it needs to be inverted and considered in Floating point. This causes the problems you're seeing. Ideally one should not use a background image or color, but instead model a billboard and apply a color/bitmap to it. Alexander

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