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<TylerTork>
So many people, so little chatting...?
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<kintel>
TylerTork It's late everywhere :) What did you press to get that result?
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<TylerTork>
Never mind, I downloaded yesterday's build and they seem to have fixed it. Didn't see the issue in github though so I don't know what PR was responsible for the fix. I'm just starting with OpenSCAD and going thru the tutorials but I'm an old hand at software projects
<petaflot>
in some cases, the engine says "no geometry to render"
<petaflot>
I have a nother model, much more complicated, which I was able to render on sept 2nd with no issue (I know this because of the stl timestamp)
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<InPhase>
petaflot: You have purple in thrown together, which means you made a polyhedron with the inside on the outside.
<petaflot>
uh wait. I see it is an old version, too. InPhase thanks now I know that the purple is XD that will help me fix it
<InPhase>
:)
<petaflot>
isn't there a function to make a polyhedron inside-out? I recycled this function (lines 124-203 of https://github.com/petaflot/scadlib/blob/main/horns.py) from somewhere (forgot to write the reference), now I inverted the order of the vertices of the faces as per https://bpa.st/FIQQ but it's the same
<petaflot>
it's a shame we get the purple faces only when doing boolean operations
<petaflot>
now I'm very confused. talking about the purple, I have this other model I made recently that has some purple too (and it's just using cylinders and extruded text)t)tm
<petaflot>
about the version, I foudn out I'm running 2021.01-r4, trying to compile current from git
<petaflot>
same thing with a cylinder and a cube. obviously purple is something else than an inside-out polyhedron
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<InPhase>
You might also have a hole or self-intersection, which can give the same inside out problem without obviously violating the right hand rule.
<InPhase>
A missing surface polygon exposes the surface inside, and a self intersection can put some of the outsides onto the insides.
<InPhase>
I mean, insides onto the outsides.
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<petaflot>
InPhase: not with the cube minus the sphere
<petaflot>
or the cube minus the cube, which also shows purple
<petaflot>
.. or else there is something serioulsy wrong
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<InPhase>
petaflot: I think you have confused yourself with your color scheme choice...
<InPhase>
That's not thrown together, but just a color scheme that has purple.
<InPhase>
Thrown together mode will not give purple there, but will actually show the entire sphere. It is a different operating mode for diagnosing polyhedrons.
<InPhase>
When I say "thrown together" I mean going from View, down to Thrown Together.
<InPhase>
Maybe if you're going to use that to diagnose, you should pick a color scheme that does not do purple insides. ;)
<InPhase>
I mean, purple carve-outs.
<InPhase>
Mine shows that in blue.
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<petaflot>
thanks
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<RoyK>
hm... anyone that knows a design for a clamp of sorts that can just fasten something to a pole? I was making some things to clamp onto a crutch for a friend, who broke his leg and I just made it so that he could fasten it with cable ties. That works, but it isn't very flexible. https://www.printables.com/model/750883-can-holder-for-mounting-on-a-crutch
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<peeps[work]>
RoyK: you looking for an existing model or ideas to implement?
<peeps[work]>
first thing that comes to mind would be a lever cam
<peeps[work]>
but that's more for quickly attaching detaching. you would have to design a part that goes around tube, but with a split, and enough flexibility (PLA probably wouldn't work, but maybe PETG, depending on thickness etc.) to slip over the tube, while having features to hold a bolt head and nut
<peeps[work]>
a bolt/nut could do the same job as lever cam as a tradeoff of simpler design vs marginally harder to attach.
<peeps[work]>
but the idea of a horizontal tray going on a crutch which is swinging around as you walk, seems not very practical to me