Ok, nothing fancy heare, I am just trying to learn about primitives, vertices and colors. Using the following code, I get a cube that rotates around, but some of the faces of the cube are semi-transparent. (I can see thru them to the face on the other side.) Can someone tell me what is going on here? verts = new CustomVertex.PositionColored[8]; verts[0].X = -1.0f; verts[0].Y = 1.0f; verts[0].Z = -1.0f; verts[0].Color = System.Drawing.Color.Red.ToArgb(); verts[1].X = 1.0f; verts[1].Y = 1.0f; verts[1].Z = -1.0f; verts[1].Color = System.Drawing.Color.Green.ToArgb(); verts[2].X = -1.0f; verts[2].Y = -1.0f; verts[2].Z = -1.0f; verts[2].Color = System.Drawing.Color.Blue.ToArgb(); verts[3].X = 1.0f; verts[3].Y = -1.0f; verts[3].Z = -1.0f; verts[3].Color = System.Drawing.Color.Yellow.ToArgb(); verts[4].X = -1.0f; verts[4].Y = 1.0f; verts[4].Z = 1.0f; verts[4].Color = System.Drawing.Color.Red.ToArgb(); verts[5].X = -1.0f; verts[5].Y = -1.0f; verts[5].Z = 1.0f; verts[5].Color = System.Drawing.Color.Blue.ToArgb(); verts[6].X = 1.0f; verts[6].Y = 1.0f; verts[6].Z = 1.0f; verts[6].Color = System.Drawing.Color.Green.ToArgb(); verts[7].X = 1.0f; verts[7].Y = -1.0f; verts[7].Z = 1.0f; verts[7].Color = System.Drawing.Color.Yellow.ToArgb(); indicies = new int [24]; indicies[0] = 0; indicies[1] = 1; indicies[2] = 2; indicies[3] = 3; indicies[4] = 4; indicies[5] = 5; indicies[6] = 6; indicies[7] = 7; indicies[8] = 4; indicies[9] = 6; indicies[10] = 0; indicies[11] = 1; indicies[12] = 5; indicies[13] = 2; indicies[14] = 7; indicies[15] = 3; indicies[16] = 1; indicies[17] = 6; indicies[18] = 3; indicies[19] = 7; indicies[20] = 0; indicies[21] = 2; indicies[22] = 4; indicies[23] = 5; vertexBuffer = new VertexBuffer(typeof(CustomVertex.PositionColored), verts.Length, device, Usage.Dynamic | Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Default); GraphicsStream gStream = vertexBuffer.Lock(0, 0, LockFlags.None); gStream.Write(verts); vertexBuffer.Unlock(); indexBuffer = new IndexBuffer(typeof(int), indicies.Length, device, Usage.WriteOnly, Pool.Default); gStream = indexBuffer.Lock(0, 0, LockFlags.None); gStream.Write(indicies); indexBuffer.Unlock(); My Render Code: device.VertexFormat = CustomVertex.PositionColored.Format; device.SetStreamSource(0, vertexBuffer, 0); device.Indices = indexBuffer; device.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, 0, 0, 8, 0, 2); device.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, 0, 0, 8, 4, 2); device.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, 0, 0, 8, 8, 2); device.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, 0, 0, 8, 12, 2); device.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, 0, 0, 8, 16, 2); device.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, 0, 0, 8, 20, 2); Thanks for the help. John