Edge artifacts

[arakis]

In Lightning Sample, you will get strange edge artifacts, if you move a litte arround the cube. This is because you dont have face culling enabled. If you enable this, the cube is drawn only half. So, the clockwiese/counter-clockwise points have to be corrected.

This may out of scope of that tutorial, but even if you don't want enable face culling, you should at least correct the vertices to:

        private readonly float[] _vertices =
        {
             // Position          Normal
             0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f, // Front face
            -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
             0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
            -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
             0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
            -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,

            -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f, // Back face
             0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
             0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
             0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
            -0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
            -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,

            -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f, // Left face
            -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
            -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
            -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
            -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
            -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,

             0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f, // Right face
             0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
             0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
             0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
             0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
             0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,

            -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f, // Bottom face
             0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
             0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
             0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
            -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
            -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,

            0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f, // Top face
           -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
            0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
           -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
            0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
           -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f
        };