Lets say I want 10 equally spaced out points on the curve, this is how I
usually do it:
int m_numDup = 10;
MFnNurbsCurve fnCurve(oCurve);
double length = fnCurve.length();
MPoint p;
for (int i=0; i <= m_numDup; i++){
MPoint p;
double param = fnCurve.findParamFromLength(i* ( (1.0 /
float(m_numDup))*length) );
fnCurve.getPointAtParam(param, p, MSpace::kWorld );
}
On Monday, April 20, 2015 at 10:33:30 AM UTC+2, Emre Tekinalp wrote:
>
> Hello everybody,
>
> I know this is mostly a Python forum, but I'm currently writing in C++ a
> deformer,
> dealing with curves yaay, hopefully it is ok nonetheless, otherwise I come
> up with a python api example...
> I have also looked through the forum and could find just a
> MFnMesh.closestPoint issue, which does not really help me unfortunately.
>
> My maya setup is as follows:
> - I have an ep curve degree=3
> - I want to affect a polyCylinder with the curve, like the wireTool
> - As a current idea, one of the steps to achieve that is to get the
> closestPoint and param on the curve for each Vertex on my polyCylinder.
> - For that I use MFnNurbsCurve closestPoint, but when I'm cout position
> and param values,
> they are mostly zeroed out and when I'm in component mode selecting the
> vertices of the mesh and move them down in ty
> I get a bunch of value changes, but only when I'm less then 0,
> everything above stays 0 (position and param values)
> - Here is the code:
>
>
> // Inside the deform method
>
> //Get the closestPoint and param on the curve from each vertex
> MFnNurbsCurve fnCurve(oCurve); //Assume we have the MObject of the
> curve already
> double param;
> MPoint position;
>
> for (;! iter.isDone(); iter.next())
> {
> //Helper method to retrieve/store the position and param value on
> the curve
> getClosestPoint(fnCurve, iter.position(), position, param);
> cout << "index: " << iter.index() << " point: " << position.x << "
> " << position.y << " " << position.z << " param: " << param << endl;
> }
>
> void Curve::getClosestPoint(MFnNurbsCurve& fnCurve, MPoint inPosition,
> MPoint& position, double& param)
> {
> position = fnCurve.closestPoint(inPosition, ¶m, 0.0, MSpace::
> kWorld);
> }
>
>
>
>
> This is basically a part from the closestPoint/TangentAndDistance.cpp
> source file.
> But for any kind of reason, I don't get proper values... am I missing
> something?
>
> Thanks in advance!
> Emre
>
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