Point Along NURBS Curve.

[Sam Jones]

Thank you to Patrick Stanford and Raymond Mullins for answering my question about getting a point along a 3D Poly.  I have just ran into the need (that I was hoping to avoid) of needing to find the 3D coordinates of a point that lies a specified distance along a NURBS curve.  Given a specified distance, can I get the location,    X,Y,Z,   of a point a specified distance along a NURBS curve?  Also, how does VS get the length of a NURBS curve.  The length in listed in the OIP does not seem to be accessible. 

 

As so often in the past TIA,

 

Sam

 

[Pat Stanford]

HLength seems to return the total length of a NURBS curve, but returns inches if the units are Feet & Inches.

 

Since I know you like long names, try:

 

GetPointAndParameterOnNurbsCurveAtGivenLength(Handle1, DesiredDistance/HLength(Handle1)/12, X1,Y1,Z1,R1,Index1);

 

Where DesiredDistance is in feet.

 

 

 

 

[Sam Jones]

41 minutes ago, Pat Stanford said:

GetPointAndParameterOnNurbsCurveAtGivenLength(Handle1, DesiredDistance/HLength(Handle1)/12, X1,Y1,Z1,R1,Index1);

 

inNurbCurveHandle to the NURBS curve.

      I know what this is.

 

inPercentOfLengthSpecify location on curve as percent of total length. (0 - 1) 

     I understand this.  I thing HLength  yields inches but I will check 

 

pPoint of specified location.

    Cool,  this is the needed coordinate

 

outParamParametric parameter of location.

    What is this (R1) and where do I get it from

 

outIndex0-based index of piece for piecewise NURBS curve.

    What is this (Index1) and where do I get it from

[Sam Jones]

Forget I asked.  R1 and Index1 are unneeded VARs.

 

Routine works wonderfully.

 

Thanks.