How to select objects with NEG volume ?

ggaliens · 11-24-2012, 05:16 PM

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.

oort · 11-24-2012, 05:54 PM

ggaliens,
What is an object with NEG volume and how do you get that kind of object???

oort

ggaliens · 11-24-2012, 06:35 PM

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.

oort · 11-24-2012, 10:29 PM

I think I have used Invert to fix objects that are inside out in the past. I can't check right now... Sad

oort

ggaliens · 11-25-2012, 02:05 AM

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.