public static Vector2 CalculateOrigin(PhysicsBody b)
{
Vector2 lBound = new Vector2(float.MaxValue);
AABB bounds;
Transform trans;
b.GetTransform(out trans);
for (int i = 0; i < b.FixtureList.Count; ++i)
{
for (int j = 0; j < b.FixtureList[i].Shape.ChildCount; ++j)
{
b.FixtureList[i].Shape.ComputeAABB(out bounds, ref trans, j);
Vector2.Min(ref lBound, ref bounds.LowerBound, out lBound);
}
}
// calculate body offset from its center and add a 1 pixel border
// because we generate the textures a little bigger than the actual body's fixtures
return ConvertUnits.ToDisplayUnits(b.Position - lBound) + new Vector2(1f);
}
