DisplayMaterial.SetBitmapTexture() and "advanced GPU lighting"

Rhino Developer
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1

When a Rhino.Display.DisplayMaterial has a bitmap texture (via .SetBitmapTexture()), its display behavior depends on whether advanced GPU lighting is enabled.

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The behavior on the left (where GPU lighting is OFF and the material behaves as an emitter) is what I want all the time. Is there a way to enforce this in RhinoCommon?

2

Hi @sarg,

I can’t check this as I’m away from the computer but how about using the bitmap as the emissive input of the DisplayMaterial and then feeding a Black color into the Diffuse?

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SetBitmapTexture() is called on the DisplayMaterial itself. As far as I can tell, there is no way to specify which propert(ies) the texture ought to apply to. The Emission property is settable, but it’s merely a Color. Ideally one would have SetDiffuseTexture() and SetEmissionTexture() methods, to disambiguate.

As an alternative, I’d take being able to toggle “advanced GPU lighting” programmatically. But that’s decidedly less polite, and I don’t see a RhinoCommon hook for it either…

4

Oh my apologies my brain wanted to see something that wasn’t there :upside_down_face:

https://developer.rhino3d.com/api/rhinocommon/rhino.display.displaymaterial/displaymaterial#(color,color,color,color,double,double)

I somehow thought I saw bitmap for those arguments but yes you appear to be correct.

And yea I can’t find anything for setting the GPU lighting either.

Hmm, I certainly would like to know, hopefully someone else comes along to help

5

I had the same problem.

In Rhino.DocObjects.Material there is a property DisableLighting. This works for me.
Apparently this corresponds to the ‘Self Illumination’ button in the Materials panel.

Then you will have to construct the DisplayMaterial from this Material.

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6

Nice find @i-Shape! This solved it for me as well.