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C# Mesh Woes

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I have successfully created, locked, written to, and unlocked my own vertex buffers. But now, when I try to do the same with the vertex buffers inside of Mesh objects (from Direct3D), I get a System.NotSupported exception when I try to write to the Graphics Stream. Here's some code. I think other people have had similar problems, but I couldn't find any solutions on the boards here. Thanks if you have any ideas. The mesh is the tiger from all the DirectX samples.

CustomVertex.PositionNormalTextured []meshVertices = new CustomVertex.PositionNormalTextured[mesh.NumberVertices];

GraphicsStream meshGS = mesh.VertexBuffer.Lock(0, 0, LockFlags.Discard);

//...manipulate vertices...


[edited by - Geronimo2000 on June 10, 2004 2:53:52 AM] [edited by - Geronimo2000 on June 10, 2004 2:54:38 AM] [edited by - Geronimo2000 on June 10, 2004 2:55:27 AM]

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