/*________*/
/*| A |*/
/*| /\ |*/
/*| / \ |*/
/*|C----B|*/
/*|______|*/
// There is no use for current algorithm because orthogonal projection should be cubic
public void Update()
{
float ShadowFarPlane = 300.0f;
float ShadowNearPlane = 30.0f;
float FoV = EngineStatics.FoV;
float halfFoV = FoV * 0.5f;
float AspectRatio = EngineStatics.SCREEN_ASPECT_RATIO;
Vector3 camWorldPosition = m_camera.GetEyeVector();
Vector3 camForward = m_camera.GetEyeSpaceForwardVector();
Vector3 camRight = m_camera.GetEyeSpaceRightVector();
// Omit y component
camForward = new Vector3(camForward.X, 0, camForward.Z).Normalized();
camRight = new Vector3(camRight.X, 0, camRight.Z).Normalized();
Vector3 camFarPlaneWorldPosition = camWorldPosition + camForward * ShadowFarPlane;
Vector3 camEdgeFarPlaneWorldPosition1 = camFarPlaneWorldPosition + camRight * ShadowFarPlane;
Vector3 camEdgeFarPlaneWorldPosition2 = camFarPlaneWorldPosition - camRight * ShadowFarPlane;
Vector3 camEdgeNearPlaneWorldPosition = camWorldPosition - camForward * ShadowNearPlane;
//Matrix3 rotationPositive = Matrix3.CreateRotationY(MathHelper.DegreesToRadians(halfFoV));
//Matrix3 rotationNegative = Matrix3.CreateRotationY(MathHelper.DegreesToRadians(-halfFoV));
//Vector3 camEdgePlaneDirection1 = (VectorMath.VectorMathOperations.TransformVec3(ref camForward, ref rotationPositive)).Normalized();
//Vector3 camEdgePlaneDirection2 = (VectorMath.VectorMathOperations.TransformVec3(ref camForward, ref rotationNegative)).Normalized();
//float edge1ProjValue = Vector3.Dot(camEdgePlaneDirection1, camFarPlaneWorldPosition);
//float edge2ProjValue = Vector3.Dot(camEdgePlaneDirection2, camFarPlaneWorldPosition);
//Vector3 edgePosition1 = camWorldPosition + camEdgePlaneDirection1 * edge1ProjValue;
//Vector3 edgePosition2 = camWorldPosition + camEdgePlaneDirection2 * edge2ProjValue;
//Vector3 edgePosition3 = camWorldPosition - camForward * ShadowNearPlane;
// TODO -> Find maxX, minX, maxZ, minZ
float maxX = Math.Max(Math.Max(camEdgeFarPlaneWorldPosition1.X, camEdgeFarPlaneWorldPosition2.X), camEdgeNearPlaneWorldPosition.X);
float maxZ = Math.Max(Math.Max(camEdgeFarPlaneWorldPosition1.Z, camEdgeFarPlaneWorldPosition2.Z), camEdgeNearPlaneWorldPosition.Z);
float minX = Math.Min(Math.Min(camEdgeFarPlaneWorldPosition1.X, camEdgeFarPlaneWorldPosition2.X), camEdgeNearPlaneWorldPosition.X);
float minZ = Math.Min(Math.Min(camEdgeFarPlaneWorldPosition1.Z, camEdgeFarPlaneWorldPosition2.Z), camEdgeNearPlaneWorldPosition.Z);
Max = new Vector3(maxX, 0, maxZ);
Min = new Vector3(minX, 0, minZ);
}
