CC3Vector CC3BillboardBoundingBoxArea::getLocationOfRayIntesection( const CC3Ray& localRay )
{
if (m_shouldIgnoreRayIntersection)
return CC3Vector::kCC3VectorNull;
// Get the location where the ray intersects the plane of the billboard,
// which is the Z=0 plane, and ensure that the ray is not parallel to that plane.
CC3Plane bbPlane = CC3Plane::plane(CC3Vector::kCC3VectorUnitZPositive, CC3Vector::kCC3VectorZero);
CC3Vector4 pLoc4 = CC3RayIntersectionWithPlane(localRay, bbPlane);
if ( pLoc4.isNull() )
return CC3Vector::kCC3VectorNull;
// Convert the location to a 2D point on the Z=0 plane, and check
// if that point is inside the rectangular bounds of the billboard.
bool intersects = getBillboardBoundingRect().containsPoint( ccp(pLoc4.x, pLoc4.y) );
// Return the 3D puncture location, or null if the ray did not intersect the boundary rectangle
return intersects ? pLoc4.cc3Vector() : CC3Vector::kCC3VectorNull;
}
CC3Vector4 CC3Camera::unprojectPoint( const CCPoint& cc2Point, const CC3Plane& plane )
{
return CC3RayIntersectionWithPlane( unprojectPoint( cc2Point ), plane );
}