Expanding on DynamicGeometry

I have a few questions about the DynamicGeometry demo, mostly related to mesh manipulation:

• How would you implement extrusion?
• How would you implement inset?

Look up CSG library for boolean, extrude and loft operations. There are a number of open source libraries out there.

Can’t i just manipulate vertices and copy them around?

What i mean is, do i really need a full-blown CSG library for doing object manipulation like this? I’m not doing brushes, addition or deletion, just face/vertex manipulation.

I guess you could start with a copy of the selected veritces’ data, offset/scale that, remove the original faces and bridge the old and new with a tri strip. But there might be a more efficient - though probably very similar - method.