C++ (Cpp) Bounds::is_null示例

bool Frustum::Intersects( const Bounds &bounds ) const {
	// Has the frustum planes been built?	
	if (!initialized_) { ASSERT(false); return false; }
	
	// Are the frustum planes up to date?
	if (needs_rebuild_) { 
		// TODO Warn them!
	}

	// Null boxes always invisible
	if (bounds.is_null()) { return false; }

	// Infinite boxes always visible
	if (bounds.is_infinite()) { return true; }

	// Get center of the box
	Vector3 center = bounds.center();

	// Get the half-size of the box
	Vector3 half = bounds.half_size();

	// For each plane, see if all points are on the negative side
	// If so, object is not visible
	for (int32 plane = 0; plane < 6; ++plane) {
		// Skip far plane if infinite view frustum
		if ((plane == FRUSTUM_PLANE_FAR)  && far_distance_ == 0) {
			continue;
		}

		int32 side = frustum_planes_[plane].Side(center, half);
		if (side == Plane::NEGATIVE_SIDE) {
			return false;
		}
	}

	return true;
}