devoluter Posted July 16, 2007 Share Posted July 16, 2007 Hi im using AutoCad2006 and im stuck. i have drawn a 3d staircase and am at the point where i need to put the handrail in. So how do you extrude a simple circle along a path - the path is a 3d spline. i get the error - Cannot extrude along 3D spline path. Cannot extrude along this path. Is there a workaround for this? Quote Link to comment Share on other sites More sharing options...
Siberian Posted July 16, 2007 Share Posted July 16, 2007 You may get this error if your path has low radius bends. Are you sure everything is aligned correctly in 3D? Do a test with a fairly straight spline and see if that works. Quote Link to comment Share on other sites More sharing options...
shinymathew Posted July 16, 2007 Share Posted July 16, 2007 one thing i would like to point out is: the tangent to the spline at the starting point of the curve should be perpendicular to the circle diameter. then give the extrude command. or make a line in the xy plane. from the end of the line try to make the spline. keep the circle at the end of the line. rotate the circle in 3d so that the circle is perpendicular to the line. now extrude using the spline as a path. other examples of railings are available in this forum. do a search in the forum. Quote Link to comment Share on other sites More sharing options...
kduck63 Posted July 16, 2007 Share Posted July 16, 2007 I have much better luck extruding along a 3d polyline. Can you retrace the spline with a 3d polyline? if you use enough points along the original spline and edit the 3d poly to smooth it a bit, you should be able to extrude a circle along it no problem. Quote Link to comment Share on other sites More sharing options...
scj Posted July 16, 2007 Share Posted July 16, 2007 You can convert a 3DSpline into a 3DPolyline using my PEDIT3D (see http://www.black-cad.de). Good luck Jochen Quote Link to comment Share on other sites More sharing options...
paulhea Posted July 16, 2007 Share Posted July 16, 2007 one thing i would like to point out is: the tangent to the spline at the starting point of the curve should be perpendicular to the circle diameter. then give the extrude command. or make a line in the xy plane. from the end of the line try to make the spline. keep the circle at the end of the line. rotate the circle in 3d so that the circle is perpendicular to the line. now extrude using the spline as a path.other examples of railings are available in this forum. do a search in the forum. If anyone understands this they're a better man than me!!!!!!!!!!!!!!!!!! Quote Link to comment Share on other sites More sharing options...
kduck63 Posted July 16, 2007 Share Posted July 16, 2007 Originally Posted by shinymathew one thing i would like to point out is: the tangent to the spline at the starting point of the curve should be perpendicular to the circle diameter. then give the extrude command. or make a line in the xy plane. from the end of the line try to make the spline. keep the circle at the end of the line. rotate the circle in 3d so that the circle is perpendicular to the line. now extrude using the spline as a path. other examples of railings are available in this forum. do a search in the forum. I think the main point of this is that your circle needs to be perpendicular the the path or you will end up with an elliptical railing cross section. Quote Link to comment Share on other sites More sharing options...
Pocket Posted July 16, 2007 Share Posted July 16, 2007 Thats exactly what it means Clarify its not simply tangent, its perpendicular to the tangent in all planes/directions along the path More accurate term would be "normal" Ok, enough of the Calculus 3 lesson Quote Link to comment Share on other sites More sharing options...
shinymathew Posted July 18, 2007 Share Posted July 18, 2007 sorry for creating the confusion. probably it do not extrude along a 3d spline when the spline is not lying in a single plane. that is all the points of the curve should be in a single plane only. straight length is not needed since the object to be extruded aligns automatically. this problem must be applicable for 3dpoly also. it will extrude when it is made of straight lines. but after pediting to spline it do not extrude. Quote Link to comment Share on other sites More sharing options...
Arnie Posted November 25, 2009 Share Posted November 25, 2009 did it work ? Quote Link to comment Share on other sites More sharing options...
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