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+--- Thread: How to select objects with NEG volume ? (/showthread.php?tid=52)
How to select objects with NEG volume ? - ggaliens - 11-24-2012
How to select objects with NEG volume ?
Can I do it ? Is it hidden in there or missing ... or I'm blind ?
Please pick one.
RE: How to select objects with NEG volume ? - oort - 11-24-2012
ggaliens,
What is an object with NEG volume and how do you get that kind of object???
oort
RE: How to select objects with NEG volume ? - ggaliens - 11-24-2012
Object with negative volume is very simply ... likely inside-out or has some HOLES.
Wings3D is a very good tool for analysis. Often when I import objects form other packages ... they are not "watertight". I doubt I'm the only one experiencing this.
I use Wings3D as a beautification tool, a vetting tool, etc in more complicated workflows.
Right now ... I want to import a few items from Surface evolver.
OORT ... Sea-Shells might ultimately import with near sero volume ... depends on whose shells they are.
RE: How to select objects with NEG volume ? - oort - 11-24-2012
I think I have used Invert to fix objects that are inside out in the past. I can't check right now...
oort
RE: How to select objects with NEG volume ? - ggaliens - 11-25-2012
Yeah ... that's actually a no-brainer Oort. But if you have a set of 400 shapes and some are inverted and some are not ... how do you pick which ones to invert to get them all in a consistent state ?
My assertion is that it can be done with a Volume test.
You can't invert them all by hand ... too many too pick and too much object vs objection occlusions for that anyway.
Seems like a missing "BY" command for objects.