inserting a knot on curve at the point that is in closest proximity to another point in 3d space

[s...@weacceptyou.com]

hello,

i have some code that finds the point on a curve closest to another curve:

crv1 = pm.PyNode(finger + 'Centre')
crv2 = pm.PyNode(finger + 'Cross')
loc = pm.createNode('locator')
locTransform = loc.getParent()

loc.setParent(crv2, s=True, r=True)
pm.delete(locTransform)
cpoc = pm.createNode('nearestPointOnCurve')

# connect ep[1] to locator local position
pm.connectAttr(crv2.editPoints[1], loc.localPosition, f=True)
crv1.worldSpace[0] >> cpoc.inputCurve
loc.worldPosition[0] >> cpoc.inPosition

vec_target = cpoc.position.get()

the result of this is the location in 3d space of the point on one curve closest to the other curve.

what i want to know is how can i insert a knot on the other curve based on this point now found in 3d space. I needs to somehow be converted to a .u[] parameter value so it can be used in the insertKnotCurve command


thanks,
Sam

[Marcus Ottosson]

Have a look at the polyListComponentConversion command.

It’s great that you post example code.

Example code make it crystal clear what it is you’re looking for. But what would make it even better, is if your example code would run.

I was about to type up an example for you, but it’s difficult when your example code doesn’t run. It would make helping you a lot easier if your code would work; that means I can paste it in and be exactly where you are. From there, helping you means filling in the blanks. Those are my favourite questions. Good for you, good for me. Win-win.

To work, your code would need (1) an import statement, (2) all nodes you referenced (e.g. finger) and (3) somehow illustrate the problem. Most of the time, this means the example would get longer; but it doesn’t have to be. The finger variable could be perhaps just a polyCube of a certain length. and your curves could be simple two-point curve nodes. Whatever helps illustrate the problem, so that you can then apply it to your real code.

​

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Marcus Ottosson
konstr...@gmail.com

[s...@weacceptyou.com]

no worries Marcus, got it,

what about this:
#####################################################
import pymel.core as pm

crv1 = pm.PyNode('curve1')
crv2 = pm.PyNode('curve2')

loc = pm.createNode('locator')
locTransform = loc.getParent()

loc.setParent(crv2, s=True, r=True)
pm.delete(locTransform)
cpoc = pm.createNode('nearestPointOnCurve')

# connect ep[1] to locator local position
pm.connectAttr(crv2.editPoints[1], loc.localPosition, f=True)
crv1.worldSpace[0] >> cpoc.inputCurve
loc.worldPosition[0] >> cpoc.inPosition

closestPnt = cpoc.position.get()

cmds.spaceLocator(n='closestPointLoc',p=closestPnt)
#####################################################

just need to create two curves near to each other and the locator created ('closestPointLoc') shows the closest point. I just need there to be a Knot created on the curve at the position of this locator...

does this make sense?

thanks,
Sam

[s...@weacceptyou.com]

i see the polyListComponentConversion command. and its not doing exactly what i was after, but maybe im using it wrong

[Neil Roche]

Hi,

You should look at the NurbsCurve methods in pymel.  You could use closestPoint() to get the vector of the point on curve2 from the closest point given (which would be the point on curve1, you vec_target), you could then use getParamAtPoint() which would return you a uvalue parameter from the point on curve2 which you get from the first method.  Then pass the uValue parameter into the insertKnotCurve command which should make you a knot at the correct place on your curve1.