Forums Houdini Indie and Apprentice Concave/Convex point select

Concave/Convex point select

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luidox
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Hey All

simple question but unfortunately not really showing up in searches here or google,…how do i select concave and/or convex points?
Edited by luidox - June 13, 2020 21:32:58

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Capture.JPG (159.7 KB)

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Herve
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Measure SOP is often the simplest way to start tackling this. Element type to Points, Measure set to ‘Curvature’. Then either group, group expression, or wrangle node to pick up points with @curvature above or below a set value.
Edited by Herve - June 13, 2020 23:39:19
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luidox
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Herve
Measure SOP is often the simplest way to start tackling this. Element type to Points, Measure set to ‘Curvature’. Then either group, group expression, or wrangle node to pick up points with @curvature above or below a set value.
is there a non vex approach for this?
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vusta
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but it is non vex.

- measure, a node
- group, a node
- base group:@curvature>0.123

surely you wouldn't complain about @curvature>0.123 being too vexy ?
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luidox
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vusta
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i did this but how does this convert to poinnts?
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vusta
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make it easier for everyone by uploading your file, otherwise we could be playing ping pong with hit 'n miss replies all day.

in your group, set group type to points ?
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luidox
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vusta
make it easier for everyone by uploading your file, otherwise we could be playing ping pong with hit 'n miss replies all day.

in your group, set group type to points ?

Attachments:
color_to_points.hipnc (167.3 KB)

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vusta
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i have absolutely no idea why you have 2 extrudes in the same loop that also has 2 iterations ?!?!?!

anyway, don't wanna know.

(you do realise that you have lots of points in straight lines which defeats the purpose of using curvature logic)

here:

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points.jpg (177.2 KB)
vu_color_to_points.hipnc (149.4 KB)

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luidox
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vusta
i have absolutely no idea why you have 2 extrudes in the same loop that also has 2 iterations ?!?!?!

anyway, don't wanna know.

(you do realise that you have lots of points in straight lines which defeats the purpose of using curvature logic)

here:
wip mate

here's the thing, im trying to select the concave then the convex in separate operations. is that not possible? thats why its so dependent on color to point control
Edited by luidox - June 15, 2020 03:17:27
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vusta
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ha!! too late, I already read your previous comments before it was edited.

(btw, i was perfectly fine with your previous comments…so there was really no need to edit them)
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vusta
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here you go bloke…

change Base Group to either convex or concave

(btw, in grouptransfer, change distance threshold to say 0.01, stupid me left it at 10 which potentially is a spanner in the works)
Edited by vusta - June 15, 2020 21:51:01

Attachments:
convexcave.jpg (180.4 KB)
vu_convexcave_points.hipnc (170.6 KB)

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anon_user_40689665
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luidox
is there a non vex approach for this?
see attached.

Attachments:
convex_concave.hipnc (376.1 KB)

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vusta
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hmmm…there's a bruteforcevex in the non vex approach…better learn vex then i guess…just kidding…
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