Jonathan Mack

jsmack

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Infrared Houdini render Oct. 27, 2020, 8:15 p.m.

Infrared doesn't look that much different than a regular black and white image expect for objects that have very different absorption spectra than under visible light, such as green foliage. You can fake it by using just the red channel and using alternate textures for those objects that are extraordinarily reflective in infrared.



Looking for some Karma tips Oct. 27, 2020, 7:40 p.m.

BrianHanke
jsmack
I made some modifications.

Ah, I see, quite a few other things needed to be changed. Very educational, thank you.

In karma emissive objects are treated like lights by default, which behaves like adding a diffuse bounce. The rendergeometrysettings disables that. The limits section of the karma lop is further reduced to zero bounces to match mantra default. Since there's no headlight in karma I had to add a light. I just used a distant light with no shadows since there's not really an equivalent to the headlight.
I also modified the materials by removing the diffuse/reflection components from the light sources. Since they are full bright, it just slows down the render to compute lighting as well.

Looking for some Karma tips Oct. 27, 2020, 6:08 p.m.

BrianHanke
What am I missing?

I made some modifications.