algorithmic modeling for Rhino
Can a (Python) component draw a preview without having an output? Like a cluster when using "Preview Contents"?
One option is to use the CustomDisplay class to draw geometry within a script. Attached a basic example.
Yeah that second one is certainly an issue. Check out this thread on the subject. It should be possible to enable/disable a CustomDisplay depending on the status of the component preview. You can access this property like so: ghenv.Component.Hidden