GH Python Compiled Component Custom Preview Display

[dadandroid (DavidAndresLeon)]

Hi

I’ve been compiling GHpython components as instructed in the following post by @piac:

Tutorial: creating a Grasshopper component with the Python GHPY compiler

GhPython in Rhino WIP ships with an all-Rhino Python compiler that can be used to create .Net compiled assemblies containing compiled instructions. Unlike other methods that are based on embedding a Python code string in a C# component, this speeds up code execution and makes reverse engineering more difficult. There are two options for the process of making a component, #1 is extremely simplified and #2 is more advanced. The component is able to pick up names, descriptions and help from the or…

with particular interest in accessing the DrawViewport functionalities for custom display, similar to the C# component.

When I run the script in procedural mode it works like a charm, but when I compile it the resulting component has its preview disabled (grayed out) and there is no way to switch the preview on. I attach a screenshot and the file with the script.

Any Idea why this might be happening? Any help would be much appreciated.

customDisplay.gh (2.5 KB)

[piac (Giulio Piacentino)]

Hi, @dadandroid

There are two issues:

1. You need to override IsPreviewCapable, otherwise, the default is that output-less parameters are considered without preview.
2. You must implement a correct bounding box computation. Here I show an example.

Thanks,

Giulio

–
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

customDisplay-fix.gh (2.7 KB)

[dadandroid (DavidAndresLeon)]

Did the trick! Cheers Giulio!