Builds a matrix that flattens geometry into a plane.

Definition

Visual Basic Public Sub Shadow( _    ByVal light As Vector4, _    ByVal plane As Plane _) public void Shadow(    Vector4 light,    Plane plane); public: void Shadow(    Vector4 light,    Plane plane); public function Shadow(    light : Vector4,    plane : Plane);

Parameters

 light Microsoft.DirectX.Vector4 A Vector4 structure that describes the light's position. plane Microsoft.DirectX.Plane Source Plane structure.

Remarks

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.


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


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.

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