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XNA 4.0 HLSL Drawing a Triangle

Posted on 2011-09-10
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I came across an article that didn't go into much depth.  Is it possible for an Effect file to automatically draw a triangle, if I feed it a Vector3 location?

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Question by:Iamtehbest
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by:satsumo
ID: 36523507
As far as I'm aware no current rendering architecture can create vertices in a shader.  To draw a triangle you need to give it three vertices.  The closest you coan get is using a point sprite with an image of triangle.

Strangely the PS2 could do this, and I suspect modern hardware works the same way.  It's the programming interfaces that get in the way.
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satsumo earned 500 total points
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Then again, maybe I was wrong.  This article describes a method of drawing multiple instances in Direct 3D, you may be able to use this method.  You still give it three vertices for a triangle, but the instance data could be a single point and the shader could change the output based on that point.

http://msdn.microsoft.com/en-us/library/bb173349(v=vs.85).aspx
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