Push Pull question


#1

These four items were made the same way, started with a vertical rectangle on top of the block, modified its shape and then push pulled it. My question, why do some shapes appear solid while the others are not?


#2

If the block is a component all shapes are solid.


#3

If the block is loose geometry SketchUp can see the Push/Pull operation on the connected upper bit in the same way as pushing a hole as for a window in a wall. When the block is wrapped up in the component container, it doesn’t impact the Push/Pull operation so then you’re just making a 3D shape. You could just delete the block and get the same result or a solid extrusion on the top piece.

This is the same sort of thing that happens when people draw a floor plan on a large face and extrude the walls upward. From underneath, the walls are open at the bottom.