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Celerity Epoch
Genius in absentia
Join date: 13 Nov 2002
Posts: 179
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11-26-2002 18:19
create cylender.
10mx10mx10m
hollow 95
advanced cut .0 - .25
top size x=0
top size y =0
*poof* object deletes itself. Try that 4 times, same result 3 of them. (1st, second and 4th)
So I decide maybe the hollow's screwing it for being badly shaped somehow. Take out the hollow and do the same procedure.
It doesn't dissappear, but it *does* resize itself into some strange shape that I can't reproduce any other way.
And it says in the object's panel that it's 10m in z, but in the world it looks less than 1.
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bUTTONpUSHER Jones
professional puddlejumper
Join date: 10 Oct 2002
Posts: 172
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cheating the tax man
11-28-2002 14:42
here's an object which appears to have a larger inside than outside.
cylinder
95% hollow
hollow type -> square
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bUTTONpUSHER Jones
professional puddlejumper
Join date: 10 Oct 2002
Posts: 172
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hybrid prims
11-28-2002 15:01
tube
top shear Y = 0.50
*change building block type to sphere
(you get a weird squashed sphere with no center)
cut End = 0.60
hollow = 55
dimple B = 0.25 E = 0.75
this looks like the fender of an antique car and is approaching the shape of the shoulders on my mech. it's elongated and i haven't yet changed the scale. you cannot make this shape by using only a sphere or a tube.
i imagine there are other strange primitives that can be made by changing the building block type after changing some attributes. have you found any?
bp
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Celerity Epoch
Genius in absentia
Join date: 13 Nov 2002
Posts: 179
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my modelling is about at the level of a toddler playing with blocks.
11-28-2002 16:42
Mostly I just throw crap together. I'm more worried when I build shapes that spontaneously cease to exist.
I will have to experiment though as eventually I'll want to build something other than walls and pet spheres.
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BuhBuhCuh Fairchild
Professional BuhBuhCuh
Join date: 9 Oct 2002
Posts: 503
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beads
11-29-2002 19:11
I've noticed the hole in the spher before too, hmm, might have to report a bug. You can get that "old car fender" style shape if you play around with torii too - and its not to tough. of course, your car might not like the physics sim as much, but thats between you and the snipers.
BBC
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Andrew Linden
Linden staff
Join date: 18 Nov 2002
Posts: 692
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12-04-2002 21:32
This is a know bug (and feature). The feature is the fact that if the geometry that is passed to the physics engine produces an object with impossible physical properties (such as negative mass, or a moment of inertia with infinite values in the tensor) then that object is banned with predjudice (deleted). This is perferrable to crashing the physics engine.
The bug is that currently it is possible to try to create bad shapes with the user interface. Some examples might include a cylinder with too large of a square hole, or a very hollow cone with an advanced cut... usually the more singular the object the more likely it will be rejected. Basically there are some singular cases that create bogus geometry which need to be fixed... the rest are due to improper fences around the UI tools (such as a cylinder with a square hole whose corners extend beyond the cylinder's circle).
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