Radiosity question

tdarcy · July 14th, 2004

Hi guys,
How many of you out there change the ambient colour slot in the material editor to black when using radiosity or should you not do that ?

abicalho · July 14th, 2004

You should not do that since Radiosity adds the color to the ambient color at render time, so you'd see no radiosity effect at all.

In fact, starting with MAX 6, there's a new utility called "Fix Ambient" that will lock the Ambient and Diffuse color, to avoid problems when rendering radiosity and Light Tracer.

Alexander

tdarcy · July 15th, 2004

Thanks for the reply Alexander,
Your answer was not quite what I was expecting.
I have gone through the radiosity tutorial by Jan.brookes.com and he very definitely tells you to change the ambient slot to black and unlock it from the diffuse slot.
With a bit of luck we will get some more input from the sleeping Viz guru's.

TD

Fran · July 15th, 2004

Hi TD,

What Alex says is true for Viz 2005 and Max 6 - ambient and diffuse should be locked. Sometimes I will have ambient darker for a troublesome material, but generally I keep them locked. For Viz 4, ambient should be set to black.

tdarcy · July 15th, 2004

Hi Fran,
Thanks for the reply, I probably should have mentioned I was using viz 4.
I'm glad you confirmed ambient should be black because unless i missed it the viz manual doesn't.
On another note have you ever thought of writing a book on how to use radiosity because from the quality of your work I'd certainly buy it.

Cheers,
TD

July 14th, 2004	#1 (permalink)
tdarcy Senior Member Join Date: Oct 2003 Location: n.ireland Age: 37 Posts: 120 Name: Trevor D'Arcy	Radiosity question Hi guys, How many of you out there change the ambient colour slot in the material editor to black when using radiosity or should you not do that ?

July 14th, 2004	#2 (permalink)
abicalho Veteran Member Join Date: Dec 2001 Location: San Francisco Age: 35 Posts: 643 Name: Alex Bicalho	Re: Radiosity question You should not do that since Radiosity adds the color to the ambient color at render time, so you'd see no radiosity effect at all. In fact, starting with MAX 6, there's a new utility called "Fix Ambient" that will lock the Ambient and Diffuse color, to avoid problems when rendering radiosity and Light Tracer. Alexander

July 15th, 2004	#3 (permalink)
tdarcy Senior Member Join Date: Oct 2003 Location: n.ireland Age: 37 Posts: 120 Name: Trevor D'Arcy	Re: Radiosity question Thanks for the reply Alexander, Your answer was not quite what I was expecting. I have gone through the radiosity tutorial by Jan.brookes.com and he very definitely tells you to change the ambient slot to black and unlock it from the diffuse slot. With a bit of luck we will get some more input from the sleeping Viz guru's. TD

July 15th, 2004	#4 (permalink)
Fran Moderator Join Date: Jul 2003 Location: Virginia, USA Posts: 1,379 Name: Frances Gainer Davey	Re: Radiosity question Hi TD, What Alex says is true for Viz 2005 and Max 6 - ambient and diffuse should be locked. Sometimes I will have ambient darker for a troublesome material, but generally I keep them locked. For Viz 4, ambient should be set to black. __________________ - Fran If you must reinvent the wheel, remember that it works best if it is, like, roundish.

July 15th, 2004	#5 (permalink)
tdarcy Senior Member Join Date: Oct 2003 Location: n.ireland Age: 37 Posts: 120 Name: Trevor D'Arcy	Re: Radiosity question Hi Fran, Thanks for the reply, I probably should have mentioned I was using viz 4. I'm glad you confirmed ambient should be black because unless i missed it the viz manual doesn't. On another note have you ever thought of writing a book on how to use radiosity because from the quality of your work I'd certainly buy it. Cheers, TD

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