Tangency of loft surfaces
Tangency of loft surfaces
(OP)
I would like to hear from anyone who may have noticed this...
Has anyone noticed how the tangency controls for lofted surfaces are not terribly accurate? I have made lofts with tangency constraints to surface edges that have been off-tangent by over 4 degrees! Using guide curves alleviates but does not always eliminate the problem.
Simple test for tangency of a loft surface to its controlling surface at a point:
1.) use 3DSketch to place a point on an edge
2.) make an axis through the point an normal to one of the surfaces
3.) make another axis with the same point and normal to the other surface
4.) measure the angle between the two normal axes
I have verified the non-tangency conditions before by exporting parasolid and importing to UG.
Has anyone noticed how the tangency controls for lofted surfaces are not terribly accurate? I have made lofts with tangency constraints to surface edges that have been off-tangent by over 4 degrees! Using guide curves alleviates but does not always eliminate the problem.
Simple test for tangency of a loft surface to its controlling surface at a point:
1.) use 3DSketch to place a point on an edge
2.) make an axis through the point an normal to one of the surfaces
3.) make another axis with the same point and normal to the other surface
4.) measure the angle between the two normal axes
I have verified the non-tangency conditions before by exporting parasolid and importing to UG.
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RE: Tangency of loft surfaces
Regards,
Scott Baugh, CSWP

3DVision Technologies
http://www.3dvisiontech.com
http://www.scottjbaugh.com
FAQ731-376
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RE: Tangency of loft surfaces
Sometimes adding profiles hurts more than it helps. There is a tendency in organic modeling to throw in more control points (in 2D) or profiles and guides (in 3D) when what is really needed to adequately define the form is curvature and direction (tangency).