Hi Mr Braun, generally when shelling a solid, the face that is selected to be an opening should have sharp corners where it attaches to the rest of the solid.
A face that is connected in a totally smooth manner to the rest of the solid will not work.
But there is an alternate method that you can use in this particular case though - select that top face:
And then delete it:
Now this open object can be shelled:
This works because shelling an open object is done by offsetting all the surfaces involved, and then performing lofts between the open edges.
Shelling a closed solid works in a different way - the surfaces of the solid are offset, except for the face that is selected as an opening, that one is just copied without an offset. This means that the other faces are extended to meet up with the copied face, and in a smoothly matching up situation that extension will not be possible.
In general it is better to perform shelling on a closed solid instead of an open surface if possible, but this is the one case where it works better on an open object instead.
- Michael |
