private void SampleGraphicsControl_GraphicsContextCreated(object sender, GraphicsControlEventArgs e)
{
GraphicsContext ctx = e.Context;
GraphicsSurface framebuffer = e.Framebuffer;
#if DEBUG
_GeometryClipmapObject = new GeometryClipmapObject(6, 7, _BlockUnit);
#else
_GeometryClipmapObject = new GeometryClipmapObject(9, 11, _BlockUnit);
#endif
string workingDir = Directory.GetCurrentDirectory();
_GeometryClipmapObject.SetTerrainElevationFactory(Path.Combine(workingDir, @"..\..\..\Data\Terrain.vrt"), 45.5, 10.5);
_GeometryClipmapScene = new SceneGraph();
_GeometryClipmapScene.AddChild(new SceneGraphCameraObject());
_GeometryClipmapScene.AddChild(_GeometryClipmapObject);
_GeometryClipmapScene.Create(ctx);
// Set projection
_GeometryClipmapScene.CurrentView.ProjectionMatrix = new PerspectiveProjectionMatrix(
_ViewFov / 16.0f * 9.0f,
(float)ClientSize.Width / (float)ClientSize.Height,
1.0f, _ViewDepth
);;
// Clear color
framebuffer.SetClearColor(new ColorRGBAF(0.0f, 0.0f, 0.0f));
}