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Also refer: https://archicad-talk.graphisoft.com/viewtopic.php?t=51395&highlight=
I’m developing a bent spring object, using the TUBE command. I’ve got the maths working, but unfortunately, the TUBE command puts small creases in the profile as it starts to go over the bend. You will also see some large twists near the apex.
I’ve have tried playing with the angle parameter, but it has little effect.
I’ve conferred with some colleagues, who are confident this is either a bug, or beyond the capacity of TUBE to deal with.
Any ideas?
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www.brucepwalker.com
https://www.mindmeister.com/65450406AC20 6005 AUS Full & AC 21 3009 NZE Full | Win 10 Pro 64 | Intel i7-7700HQ 2.80GHz | 16 Gb RAM
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The tube command has some limitations: when any parts of your tube is nearly vertical in your current local coordinate system, then the cross section can be twisted, this causes your shadows. The only solution is to split up it to some parts and avoid vertical parts. Maybe an updated tube command can solve this limitation in a future version, but now you can only split it up to parts.
Gergely Fehér
Team Leader, Library Team
GRAPHISOFT SE -
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+1 to TUBE renovation. Working around the twisting is very cumbersome, and it’s surprising that the angle argument doesn’t help it. When you renovate TUBE, take a look at how a cross section with sharp corners renders in OpenGL. It seems to assume that TUBEs are generally curvy. To get around this, I have resorted to a chain of mitered PRISM_s. The trouble with that is the contour of the curve becomes invisible. I’d like to see something like PRISMTUBE, where we have PRISM_ type status codes, but it can follow a path.
James M
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