Grasshopper

algorithmic modeling for Rhino

Can a (Python) component draw a preview without having an output? Like a cluster when using "Preview Contents"?

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One option is to use the CustomDisplay class to draw geometry within a script. Attached a basic example.

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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

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