Forums Technical Discussion Get the 2 CVs from a curveu on a NURBS curve.

Get the 2 CVs from a curveu on a NURBS curve.

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JohnDoe777
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Hello,

I have a NURBS curve and I want to grab the before and after CVs depending on the provided curve u value. Anyone got any ideas how I could do this?

Thanks

Edited by JohnDoe777 - Dec. 31, 2024 09:12:52

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curve_example.png (244.2 KB)

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antc
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Are you looking for a python script/tool? Or a sop network that places whichever two points in a group?
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JohnDoe777
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antc
Are you looking for a python script/tool? Or a sop network that places whichever two points in a group?

Sorry probably should have clarified. A python script preferably. Need it as part of a viewer state for creating curves and having the option of inserting new CVS along the curve.
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tamte
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maybe an overkill to dig through, but you can probably find what you are looking for in the Curve viewer state since it also supports adding new CVs to NURBS curves
Tomas Slancik
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Method Studios, NY
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antc
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I'm not sure how the curve sop does things, but to insert at a particular u position and have the CV's update you might be able to use the carve sop verb. Something like 

carve_verb = hou.sopNodeTypeCategory().nodeVerb("carve")
carve_verb.setParms({'domainu1': u_value, 'keepout': 1})
carve_verb.execute(geometry, [input_geometry])

EDIT: refine verb is probably a better choice to add a break point.

Try this in a python sop as an example, with a curve sop plugged into the first input of the python sop.

node = hou.pwd()

new_geo = hou.Geometry()

refine_verb = hou.sopNodeTypeCategory().nodeVerb("refine")
refine_verb.setParms({'domainu1': 0.1})
refine_verb.execute(new_geo, [node.input(0).geometry()])

node.geometry().clear()
node.geometry().merge(new_geo)
Edited by antc - yesterday 11:06:37
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