Physics Based Blackbody Radiance of Surfaces

[Anonymous]

Hello,

I want to specify a temperature of a surface, typically 40K to 400K and render that surface with a camera at 10 microns. I see there is a Mental Ray that specifies a temperature but the temperatures start at 1000K.  Also its not clear that this simulation is physics based (ie., using Planck's BlackBody Radiance). Anyone done anything like this? Any suggestions?

Russ

[Anonymous]

There is the mib_blackbody shader. It's hidden by default, but can be easily unhidden by editing the base_max.mi file.

I don't know how physically accurate it is.

[Anonymous]

Hi Samab,

Thanks for responding. Who would know the answer to how accurate the Blackbody Shader is? I want to be able to apply blackbody radiance to specific parts. I am thinking right now, the only way to do this is to write code.  I appreciate your thoughts/help.

Russ

[Anonymous]

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RAC wrote:Who would know the answer to how accurate the Blackbody Shader is?

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Master Zap would probably know, he created a lot of the mr shaders.

Jeff Patton is another who knows a lot about mr shaders, I think I found out about blackbody from his blog.

Both have accounts in The Area, but I have not seen either of them post here in a long while.

[Anonymous]

O.K.  Thanks.  I found reference to blackbody radiance in Blender http://elbrujodelatribu.blogspot.com/2013/08/blender-cycles-black-body-lights.html 

This is the kind of modeling I need only at T= 40K-400K which has a peak radiance ~10 microns.

Thanks

Russ