opCreateCurvesOnFace() for parameters 0 and 1 fail?

EvanReese · February 19

Even the native Isoparametric Curve feature can't do a parameter of 0 or 1 on a periodic surface (for example: to get the circular end of a cylinder). Does anyone know a decent workaround?

EvanReese · February 20

Thanks fellas. Here's what I ended up coming up with. Since my case is somewhat narrow I don't have to worry about dealing with trimmed surfaces and I know that the only 2 edges a periodic surface will have are the ones I need.

function getEdgesOfPeriodicSurface(context is Context, face is Query) returns array
{
var paramPoints = evFaceTangentPlanes(context, {
        "face" : face,
        "parameters" : [vector(0, 0), vector(1, 1)]
    });

return [qContainsPoint(edges, paramPoints[0].origin), qContainsPoint(edges, paramPoints[1].origin)];
}

S1mon · February 20

A guess: split the cylinder in halves, and create two curves?

MichaelPascoe · February 20

Could you use evFacePeriodicity and evApproximateBSplineSurface to get the underlying surface then get get the curve from that?

EvanReese · February 20

Thanks fellas. Here's what I ended up coming up with. Since my case is somewhat narrow I don't have to worry about dealing with trimmed surfaces and I know that the only 2 edges a periodic surface will have are the ones I need.

function getEdgesOfPeriodicSurface(context is Context, face is Query) returns array
{
var paramPoints = evFaceTangentPlanes(context, {
        "face" : face,
        "parameters" : [vector(0, 0), vector(1, 1)]
    });

return [qContainsPoint(edges, paramPoints[0].origin), qContainsPoint(edges, paramPoints[1].origin)];
}

opCreateCurvesOnFace() for parameters 0 and 1 fail?

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