void DrawAxes()
{
PositionColored[] xAxis = new PositionColored[2] {
new PositionColored(new Vector3(0), Color.Red.ToArgb()),
new PositionColored(new Vector3(10, 0, 0), Color.Red.ToArgb()) };
PositionColored[] yAxis = new PositionColored[2] {
new PositionColored(new Vector3(0), Color.Green.ToArgb()),
new PositionColored(new Vector3(0, 10, 0), Color.Green.ToArgb()) };
PositionColored[] zAxis = new PositionColored[2] {
new PositionColored(new Vector3(0), Color.Blue.ToArgb()),
new PositionColored(new Vector3(0, 0, 10), Color.Blue.ToArgb()) };
Device.SetRenderState(RenderState.ZEnable, ZBufferType.UseZBuffer);
Device.SetRenderState(RenderState.VertexBlend, VertexBlend.Disable);
Device.SetRenderState(RenderState.Lighting, false);
Device.SetTransform(TransformState.World, Matrix.Identity);
Device.VertexFormat = PositionColored.Format;
Device.Material = Renderer.NullMaterial;
Device.SetTexture(0, null);
Device.DrawUserPrimitives(PrimitiveType.LineList, 1, xAxis);
Device.DrawUserPrimitives(PrimitiveType.LineList, 1, yAxis);
Device.DrawUserPrimitives(PrimitiveType.LineList, 1, zAxis);
}