How much information can you store in vertex color?

Question

I use the color of the vertex to decide which texture should be used and got 4 textures working:

Texture 1 : Red
Texture 2 : Green
Texture 3 : Blue
Texture 4 : Black

I tried to add the color White to gain a fifth texture, but this didn't work because it behaved like a overlay on top of the other textures (Well, this could be expected...).

So my question is: how could I store more information into my vertics?

Answer 1

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Answer by 0tacun · Oct 09, 2014 at 08:13 PM

I came to the conclusion: How much you need. It is possible to get the color value from a certain range:

     half value = step( 0.5, IN.color.r);
     half value2 = 1-step( 0.5, IN.color.r );
 
 tex2D( _Tex1, IN.uv_Tex1 ) * value +     tex2D( _Tex2, IN.uv_Tex1 ) * value2

value is in the range of the red channel from 0.5 to 1.0, while value 2 is in 0.0 to 0.5. Both return 1 if the step function is true. How much performance it costs is a different matter.

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Answer 2

Answer by Cherno · Sep 19, 2014 at 06:24 PM

I found a shader that supported 8 diffuse textures, but I think that's the limit. Anything more will have to emulate Unity Terrain's splat map system (which I would love to clone for custom meshes).

The name of the shader is "TMG_8SplatShader_Diffuse".

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0tacun · Sep 19, 2014 at 06:31 PM 0

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Ah thank you for your reply! Well it looks like he is using two textures to have 8 information. That would do, but I use the vertex color aprouch so I don't need to uv the control map. Unfortnuatly in Blender I can't paint the alpha channel on the vertics, if I could I would gain one extra texture.

How much information can you store in vertex color?

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