topic Re: (MEL)getting curve cv parameter? in Maya Programming Forum

(MEL)getting curve cv parameter?

absoluteKelvin — Sat, 09 May 2020 18:28:45 GMT

{ string $selected[] = `ls -sl`; string $shapes[]; float $uParam[] ; for ($curve in $selected){ int $CVs =`getAttr ($curve + ".spans")`; $shapes = `listRelatives -shapes $curve`; string $nearestInfo = `createNode nearestPointOnCurve`; connectAttr ($shapes[size($shapes)] + ".worldSpace") ($nearestInfo +".inputCurve"); for ($x = 0; $x < $CVs; $x++) { vector $location = `pointPosition ($curve + ".cv[" + $x + "]")`; setAttr ($nearestInfo + ".inPositionX") ($location.x); setAttr ($nearestInfo + ".inPositionY") ($location.y) ; setAttr ($nearestInfo + ".inPositionZ") ($location.z) ; $uParam[$x] = `getAttr ($nearestInfo + ".parameter")`; //format getAttr nearestPointOnCurve1.parameter; string $Parameter = $uParam[$x]; print ($Parameter + "\n"); } delete $nearestInfo; } }

this is the code i came up with after reading up on documentations and help from sites https://nccastaff.bournemouth.ac.uk/jmacey/RobTheBloke/www/mel/DATA_ncurve.html

http://download.autodesk.com/global/docs/maya2012/en_us/Nodes/nearestPointOnCurve.html

Currently it works on one curve. But Its suppose to work for multiple curves. When I run it it gives me

// Error: line 9: The source attribute '.worldSpace' cannot be found. //

Re: (MEL)getting curve cv parameter?

stuzzz — Sat, 09 May 2020 19:51:07 GMT

looking at Nurbs shape output attributes in maya2018, worldSpace attribute is an array.

so you may explicitly specify an index to worldspace ( ie. worldspace[0] )

connectAttr ($shapes[size($shapes)] + ".worldSpace[0]") ($nearestInfo +".inputCurve");

Re: (MEL)getting curve cv parameter?

absoluteKelvin — Sat, 09 May 2020 21:02:19 GMT

i edited the code with your suggestion, but this occurs when i have 2 curves selected.

// Error: line 9: The source attribute '.worldSpace[0]' cannot be found. //

Re: (MEL)getting curve cv parameter?

absoluteKelvin — Sat, 09 May 2020 21:10:40 GMT

i found the issue. d'ohhh its the shapes[size($shapes)] thats causing issues

with this it will work regardless even without .worldSpace[0]

connectAttr -force ($shapes[0] + ".worldSpace") ($nearestInfo +".inputCurve");

Re: (MEL)getting curve cv parameter?

stuzzz — Sat, 09 May 2020 21:23:48 GMT

great!