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Old 07-27-2013, 04:18 AM   #1
Farifield, USA
Join Date: Feb 2010
Posts: 36
maya shader that blends with light direction

Im trying to create a planet shader where areas that are illuminated by a directional light show one material, and the areas not illuminated use a different material (Day/night).

I'm using vray. I've been trying all sorts of combinations with the blendColors, lightDirection, SampleInfo, Surf.Luminance nodes with no luck.

Ideally, I'd like to have a shader that will actively blend between the Day and Night materials depending on the angle the light hits the surface. The only other method I can think of to at least show the blending is to do it in post, but wheres the challenge in that?
Old 07-27-2013, 01:04 PM   #2
Simon Bunker
Shader Writer / TD
Join Date: Jan 2003
Posts: 1,040
Can you use the outColor from a white lambert shader to use as the blend?

Old 07-27-2013, 07:19 PM   #3
Farifield, USA
Join Date: Feb 2010
Posts: 36
To connect the outColor of the lambert to the blend factor, you'd first have to use an RGBtoLuminance to convert it to a single value. Even so, it would work exactly the same as the blend factor by itself (white 1, black 0)

What I need is something that would sample the surface luminance and use that value to control the blend.

....Just after writing that, I tried the Surf.Luminance node using the default connection, and it works! Apparently the effect doesnt show in IPR rendering. Heres a successful test image of the blend from day to night:

Thanks for the response though. Good team work!
Old 07-27-2013, 07:20 PM   #4
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