# Mesh Normals

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Hi I'm new to development in DirectX and am having some problems getting lighting to work on a mesh that I have generated. When I try to light my mesh the faces appear to lighten and darken together (http://img168.imageshack.us/img168/2749/meshproblemexampleshz2.th.jpg). Can anyone help me out? private void ConstructMesh() { // Create a mesh. mesh = new Mesh( 16, //faces 10, //vertices 0, // no flags VertexFormats.Position, // Position information only device); // Set up the 8 corners of the cube int circleDivisions = 8; float radius = 2; CustomVertex.PositionOnly[] vertices = new CustomVertex.PositionOnly[circleDivisions + 2]; //Create vertices around a circle on the x-z plane. for (int i = 0; i < circleDivisions; i++) { double theta = (2 * Math.PI / circleDivisions) * (double)i; float z = radius * (float)Math.Sin(theta); float x = radius * (float)Math.Cos(theta); vertices = new CustomVertex.PositionOnly(new Vector3(x, 0, z)); } //Create two additional vertexes above and below the circle. vertices[8] = new CustomVertex.PositionOnly(new Vector3(0, 2, 0)); vertices[9] = new CustomVertex.PositionOnly(new Vector3(0, -2, 0)); // Indices for all 16 faces. short[] indices = new short[] { 0, 1, 8, 1, 2, 8, 2, 3, 8, 3, 4, 8, 4, 5, 8, 5, 6, 8, 6, 7, 8, 7, 0, 8, 0, 1, 9, 1, 2, 9, 2, 3, 9, 3, 4, 9, 4, 5, 9, 5, 6, 9, 6, 7, 9, 7, 0, 9 }; mesh.SetVertexBufferData(vertices, LockFlags.None); mesh.SetIndexBufferData(indices, LockFlags.None); int[] adjacency = new int[mesh.NumberFaces * 3]; mesh.GenerateAdjacency(0.01F, adjacency); //Attempt to calculate normals for the mesh. Mesh tempMesh = mesh.Clone(mesh.Options.Value, mesh.VertexFormat | VertexFormats.Normal, device); tempMesh.ComputeNormals(); mesh.Dispose(); mesh = tempMesh; mesh.OptimizeInPlace(MeshFlags.OptimizeVertexCache, adjacency); }

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Is this Mesh your own data type? You could try visualizing normals (send them to the pixel shader and output them as color) to see how they look.

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The mesh is not a custom type I've created, it belongs to the namespace Microsoft.DirectX.Direct3D. I should also have mentioned that I'm using DirectX 9.0.

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