[V8i MDL] Get Koordinates from BSpline

Has anyone an idea or a tip for me to get the correct coordinates?

Martin

What does the old "analyze element" dialog show for the B-spline Pole component? The values shown in analyze should match your un-weighted pole values.

* You are printing pole.x 3 times in your printf instead of x, y, z...

-B

Hello Brien,

Thanks for your answer,

The coordinates in the Information Dialog and the Analyse Dialog are the same.

(The DGN with the BSpline Curve is attachted to my first Post)

Martin

Ah, completely missed that a dgn was attached. How are you converting from uors to master units? Your model has a global origin offset...maybe you aren't accounting for that correctly?

-B

I use

mdlCurrTrans_begin ();
mdlCurrTrans_masterUnitsIdentity (TRUE);

...

reading BSpline coordinates

...

mdlCurrTrans_end ();

I use

mdlCurrTrans_begin ();
mdlCurrTrans_masterUnitsIdentity (TRUE);

...

reading BSpline coordinates

...

mdlCurrTrans_end ();

When I use mdlLinear_extract (poles, &numVerts, &oEld->h.firstElem->el, ACTIVEMODEL); to extract the control points, they match what the element information displayed. Can't explain why they are different with the result of mdlBspline_xxx functions.
Regards, YongAn

Martin,

Finally had a chance to look at this. It appears that mdlBspline_extractCurve has a bug. You can get the correct information as follows:

MSBsplineCurve curve;

if (SUCCESS == mdlBspline_convertToCurve (&curve, edP))
{
if (curve.rational && curve.weights)
mdlBspline_unWeightPoles (curve.poles, curve.poles, curve.weights, curve.params.numPoles);

for (int i=0;i<curve.params.numPoles;i++)
printf("%f %f %f\n", curve.poles[i].x, curve.poles[i].y, curve.poles[i].z);

mdlBspline_freeCurve (&curve);
}

Yongan, Brien,

Many thanks for the help. Now everything works as desired.

Regards

Martin