public override IDAEDirectionalLightNode CreateDirectionalLightNode(string name, DAEVector4 color)
{
var light = new DirectionalLightNode();
light.Name = name;
light.Color = GetColor4(color);
return(light);
}
public Vector4 PrepareProjection(SceneNode root, Matrix4 camSliceFrustumProjMatrix, CameraNode cam, DirectionalLightNode light)
{
CameraSliceFrustum.ProjectionMatrix = camSliceFrustumProjMatrix;
CameraSliceFrustum.GetBoundingBox(cam.GetWorldTransform(root) ?? Matrix4.Identity, light.GetInverseWorldTransform(root) ?? Matrix4.Identity, _frustumBounding);
CameraSliceFrustum.GetBoundingBox(_frustumMaxExtend);
float size = (_frustumMaxExtend.Max.Value - _frustumMaxExtend.Min.Value).Length;
float worldUnitsPerTexel = size / RenderTarget.DepthStencilBuffer.Width;
Vector3 min = _frustumBounding.Min.Value;
min /= worldUnitsPerTexel;
min = new Vector3((float)System.Math.Floor(min.X), (float)System.Math.Floor(min.Y), (float)System.Math.Floor(min.Z));
min *= worldUnitsPerTexel;
LightFrustum.ProjectionMatrix = Matrix4.OrthoOffCenterRH(min.X, min.X + size, min.Y, min.Y + size, light.NearPlane, light.FarPlane);
Vector4 shadowOffsetAndScale = new Vector4(
(-0.5f - min.X),
(-0.5f + min.Y + size),
1 / size,
1 / size);
return(shadowOffsetAndScale);
}
