Original User: matthiasbuehlerHi,The Model Hierarchy cannot be queried 'back up'.Means you need to set up the projection at an early enough level, even before you construct those rectangles.e.g. if the full width is 5 meters, you know that the height is 2.5 meters, so you set up that projection, then when you have the full construction further down, you just projectUV(0).==> setupProjection() and projectUV() do not need to be sitting right next to each other in code.ok ?Matt