Function BoundingBoxProject

trinity/Utilities/BoundingBox.cpp:268–328

}

void BoundingBoxProject( Vector3& min, Vector3& max, const Matrix& view, const Matrix& proj, const TriViewport& vp )
{
	Vector3 corners[8];

	corners[0] = min;

	corners[1].x = min.x;
	corners[1].y = min.y;
	corners[1].z = max.z;

	corners[2].x = max.x;
	corners[2].y = min.y;
	corners[2].z = min.z;

	corners[3].x = max.x;
	corners[3].y = min.y;
	corners[3].z = max.z;

	corners[4] = max;

	corners[5].x = max.x;
	corners[5].y = max.y;
	corners[5].z = min.z;

	corners[6].x = min.x;
	corners[6].y = max.y;
	corners[6].z = max.z;

	corners[7].x = min.x;
	corners[7].y = max.y;
	corners[7].z = min.z;

	Matrix viewProj = view * proj;
	for( int i = 0; i < 8; ++i )
	{
		corners[i] = TransformCoord( corners[i], viewProj );
		Vec3TransformByViewport( corners[i], vp );
	}

	min = corners[0];
	max = corners[0];
	float* pMin = (float*)&min;
	float* pMax = (float*)&max;

	for( int i = 1; i < 8; ++i )
	{
		float* pCorner = (float*)&corners[i];

		for( int component = 0; component < 3; ++component )
		{
			if( pCorner[component] < pMin[component] )
			{
				pMin[component] = pCorner[component];
			}
			if( pCorner[component] > pMax[component] )
			{
				pMax[component] = pCorner[component];
			}