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murray  
#1 Posted : Tuesday, July 05, 2016 6:12:48 PM(UTC)
murray

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Kind of a technical one, maybe Tim will answer? I've been fooling with the open-source FreeCAD program, which has many useful Python macros, one of which unrolls ruled surfaces, but sometimes chokes. I'm wondering if I use surface extend on a ruled surface, does the extension extend along the ruling lines, so that the surface including extension is still a ruled surface that the FreeCAD macro might unroll?
Tim Olson  
#2 Posted : Tuesday, July 05, 2016 10:10:25 PM(UTC)
Tim Olson

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>>I'm wondering if I use surface extend on a ruled surface, does the extension extend along the ruling lines, so that the surface including extension is still a ruled surface

Yes, the extended surface should still be a ruled surface.

As a quick check:

Edit: Change Object Type to Surface the Extended Surface

Select the surface and show the data entry tab of the inspector.

A ruled surface will have a degree v = 1. Degree 1 is linear. A degree 1 surface should be developable (unfold).

Do a Edit:Show Points to see the underlying control points


Tim

Edited by user Tuesday, July 05, 2016 11:13:41 PM(UTC)  | Reason: Not specified

Tim Olson
ViaCAD/Shark Development Team
EvoSoft
Links to ViaCAD Resources
murray  
#3 Posted : Tuesday, July 05, 2016 11:06:05 PM(UTC)
murray

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Thanks Tim! That's excellent.

Murray
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