- add full set of constraints
- UI representation constraints
- add more free drawing capabil., create origin ref
- add support for arcs and lines
- add object properties panel
- make dims selectable
- delete objects from scene

- initialization / adding new objects
- cut inside
  - border cases
- RCP framework
- facets
- assembly constraints
- export to STL
- object basic 3d operations(rotate/scale/translate)
- wireframe for solids

- save/share in the cloud 
- open library