How to make a HDA show additional geomery in Scene View?

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For example, Ray SOP has an option to show guide geometry:



How to make my own custom HDA show some additional geometry and make it toggleable, just as Ray SOP does?
Edited by raincole - March 7, 2024 03:01:19

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For example, it could be done like this.
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Personally I am not a huge fan of the guide geometry system. This approach is more powerful IMO:

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Thank you guys! Didn't know it's so simple.
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