Messages from Loft operation

[keithsloan52]

Okay I have a cylinder (small) and a cone as per

3364BF7F-3184-4437-AC1E-281D4F982EC3.jpeg (21.07 KiB) Viewed 1085 times

I am trying to create a Loft from the top of the small cylinder to the top of the cone.
I do this by creating two circles with Part.makeCircle with appropriate Radius.
I translate the two circles to the top of the cylinder and cone respectively
then make a Loftshape with Part.makeLoft([circle1, circle2])
It looks okay

E9505C65-EC72-4B56-BF83-1A8C8DFE851A_4_5005_c.jpeg (19.26 KiB) Viewed 1085 times

But in Report View I get the following messages

Code: Select all

19:46:53  1997.47 <App> Document.cpp(3527): two_cylinder#cylinder still touched after recompute
19:46:53  1997.47 <App> Document.cpp(3527): two_cylinder#cylinder001 still touched after recompute

What is it not happy about?

[openBrain]

Without any code or file, this is blind guess but looks like a dependency issue in expressions or mapping.

[keithsloan52]

Without any code or file, this is blind guess but looks like a dependency issue in expressions or mapping.

Unfortunately the code is quite complicated.
The github repro is https://github.com/KeithSloan/OpenSCAD_Alt_Import
branch is parallel
Test file is

two_cylinder.csg

(412 Bytes) Downloaded 17 times

The two objects as just an OpenSCAD group as oppposed to a hull request

two_group_cylinder.csg.scad

(413 Bytes) Downloaded 17 times

The main code for this is in OpenSCADHull.py where it try's to handle the hull request without resorting to using Meshes

[chrisb]

If I should do this in the GUI, I would use a Draft FaceBinder to create the loft. If you can do it by program it may help avoiding rounding errors.

[edwilliams16]

Since the object you are creating is a cone with known parameters, can you just use Part.makeCone?

[keithsloan52]

@chrisb and @edwilliams16

I am trying to improve the OpenSCAD importer i.e Rather than use OpenSCAD to produce a Mesh for a Hull operations I am trying to check for certain conditions and do a direct Brep equivalent, in some cases this means trying a Loft operation.

So alternatives using GUI is not really an option.

[chrisb]

I didn't mean to change from the loft to something else, only to use the faces instead of the circles.

[edwilliams16]

Another option would be to revolve a quadrilateral, like in the two sphere case.

[keithsloan52]

I didn't mean to change from the loft to something else, only to use the faces instead of the circles.

But as far as I know there is not a way to know when you have something like a cylinder or a cone what order the faces in Object.Faces are in. Like for example for a Cylinder if the top Face is Object.Faces[0] will it always be index 0 etc. Also true for future releases etc

[chrisb]

But as far as I know there is not a way to know when you have something like a cylinder or a cone what order the faces in Object.Faces are in.

You are right. That can be done only if you get the faces as input.