Matrix.Shadow(Vector4,Plane) Method (Microsoft.DirectX)
Builds a matrix that flattens geometry into a plane.
The Shadow method flattens geometry into a plane, as if it were casting a shadow from a light.
This method uses the following formula to compute the returned matrix.If the light's w-component is 0, the ray from the light's origin represents a directional light. If the w-component is 1, the light is a point light.P = normalize(Plane); L = Light; d = dot(P, L) P.a * L.x + d P.a * L.y P.a * L.z P.a * L.w P.b * L.x P.b * L.y + d P.b * L.z P.b * L.w P.c * L.x P.c * L.y P.c * L.z + d P.c * L.w P.d * L.x P.d * L.y P.d * L.z P.d * L.w + d