Q for the shader gurus

Technical questions, etc..
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Peter
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Q for the shader gurus

Post by Peter » 11 May 2010, 23:42

Is it possible to build a shader from components in the library that blends an object's existing vertex colors with a diffuse mapped texture?

Any help would be appreciated.
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Prodigy
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Re: Q for the shader gurus

Post by Prodigy » 12 May 2010, 01:48

can you please share exactly the shader that you want to merge with the texture? i don't understand what you mean with "existing vertex colors "
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Peter
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Re: Q for the shader gurus

Post by Peter » 12 May 2010, 23:36

Sure,
Here is a cube with one vertex colored red (imported from another 3D program).
Clip01.jpg
Clip01.jpg (22.04 KiB) Viewed 1595 times
When you switch from Model to Workspace, here's the shader it provides.
If you set VertexColorStrength as shown you can see the red vertex mixed with the DiffuseColor in the image above. (I picked a gray shade but it looks white for some reason)
Clip02.jpg
Clip02.jpg (32.92 KiB) Viewed 1598 times
I would like to do this with a texture map instead of just the plain diffuse color.
That's the reason for my question.
Is it possible with some other shader?
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Prodigy
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Re: Q for the shader gurus

Post by Prodigy » 12 May 2010, 23:47

can you share that cube?? i never seen a vertex color on workspace side :shock:
i think is totally possible.. let me try
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Peter
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Re: Q for the shader gurus

Post by Peter » 13 May 2010, 01:04

Ok, Prodigy.
here it is...
VertexColoredCube.zip
(63.79 KiB) Downloaded 82 times
How I made it:
In Blender I painted the one vertex and exported it as a .cob.
Then I loaded it into model-side in TS7.6.

This can potentially allow us to bake fake AO to vertices in Blender or Wings3D and import this as a model with dirty or stained coloration that you can mix with textures!

I couldn't figure out how to paint vertices in TS.
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Re: Q for the shader gurus

Post by Prodigy » 13 May 2010, 01:20

Wow, that's weird! i never seen something like that before..
also i don't know how to paint a vert on workspace side, i remember that feature on model side but not on WS.

To get a mix between VP and a texture first we need to find how to duplicate that with another shader..
far as i know is not possible to merge 2 shaders but you can mix on a new one.. so we must find first a way to paint a vert first..

Great find Peter :worship:
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Re: Q for the shader gurus

Post by Peter » 13 May 2010, 02:36

Well...
If I'd been more observant I would have noticed a "paint vertices" on model side.
This is in the material widget panel. When you paint some vertices and switch to WS you can only see the colors you painted when you set VertexColorStrength to 1.

-Don't see a "paint vertices" icon in WS.

-Colors from vertices don't seem mix with texture colors in MS, either.

-Sounds like a script is needed, I couldn't find any components in the library that would help.
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Re: Q for the shader gurus

Post by clintonman » 13 May 2010, 02:42

I think that information is stored in the mesh vertices, not the material. If you sample the cube material and apply it to another cube you don't get the vertex color applied.
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Re: Q for the shader gurus

Post by trueBlue » 26 May 2020, 21:40

Fooling around with a D3D Vertex Shader on the right
DX Vertex shader.png
But... oddly in Model
Model.png
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