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I'm writing a shader and I just wanna ask if it's possible to get the ID of the vertex that is currently being manipulated. I read something about gl_vertexID, but I couldn't find out if that is something I can use.

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1 Answer 1

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Answer: Added the vertexIDs in a second uv(set x value to the id) channel in the mesh(from my c# code), and then in the shader I could use the ids as I needed, example:

     void function(inout appdata_full v) 
     {     
          int vertexID = v.texcoord1[0]; 
          ...
     }
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Be sure to accept your own answer. –  Alex M. Aug 10 '14 at 22:01
    
Will do! Have to wait 20 hours apparently. Thanks for the reminder tho :) –  sebbn Aug 10 '14 at 22:08
    
VertexID is auto-generated as a system variable in Direct3D Shader Model 4.0 (Feature Level 10.0 hardware or later), but for older shader models you have to generate it yourself as was done in this answer. –  Chuck Walbourn Aug 11 '14 at 4:17

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