What's the spectral rendering in MR 3.5 ?

[mattMR]

Hello,

I'm a bit curious about this option : Spectral rendering. I know that MR add the path_material to do path tracing... I use also the Pavel's PMegaTK shader who add path indirect illumination, But spectral rendering :?

If somebody had an idea about this shader and render mode, could you give me more information ?

PS : I have many questions about MR 3.5...

Best regards.

>Matt

[bart]

I will eventually be putting up tips on this subject, and it is possible this could be added as an advanced training class.

A spectrum allows you to specify values over a spectrum of wavelengths. These values could be energy flux (watts) from a light, or radiance, or irradiance, or whatever makes sense in the way you are putting the scene together.

This means that you need to put together a kit of shaders that match each other for it to work correctly.

You specify it by adding a special spectrum colorprofile to the options.

Currently, we work with it in standalone. To incorporate it into an OEM app, I would guess that there would need to be some UI invented for spectrum specification.

[mattMR]

Thank for your answer Bart.

PS : I'm in France and I would like to know if there are a way to had Classes via the net or something like that ?

>Matt

[Remydrh]

Kinda verbose but a couple links help explain some of it. I do notice tonemap functions time to time in mental ray feedback, this was the first time I saw a better explanation of what was going on (second link).


http://www.anyhere.com/gward/papers/PicturePerfect.pdf

http://web.cs.wpi.edu/~emmanuel/courses/cs563/write_ups/cliffl/images/Spectral_Rendering.pdf

I've seen some shader implementations in things like Maxwell where some materials are defined in nanometers or angstroms can't recall which right now. ("Spectral BDRFs")

I noticed mental ray has functions to define colorspace output with standalone.

[mattMR]

Thanks for the links :wink:

>Matt

[SunDevilDave]

I am sure the answer is "no", but have there been any developments in this?

-Dave