Get the bounding box of a group with Minko.

gistfile1.as

public function getBoundingBoxOfGroup(group : Group) : BoundingBox
{
	var min : Vector4 = new Vector4(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
	var max : Vector4 = new Vector4(Number.MIN_VALUE, Number.MIN_VALUE, Number.MIN_VALUE);
	
	for each (var mesh : Mesh in group.getDescendantsByType(Mesh))
	{
		var worldMin : Vector4	= mesh.localToWorld(
			mesh.geometry.boundingBox.min, null, false, true
		);
		var worldMax : Vector4	= mesh.localToWorld(
			mesh.geometry.boundingBox.max, null, false, true
		);
		
		if (worldMin.x < min.x)
			min.x = worldMin.x;
		if (worldMax.x > max.x)
			max.x = worldMax.x;
		
		if (worldMin.y < min.y)
			min.y = worldMin.y;
		if (worldMax.y > max.y)
			max.y = worldMax.y;
		
		if (worldMin.z < min.z)
			min.z = worldMin.z;
		if (worldMax.z > max.z)
			max.z = worldMax.z;
	}
	
	return new BoundingBox(min, max);
}