[Fixed]About strange value in moment of inertia

[tatt61880]

Edit: (by tatt61880 on 2010.12.26 15:28)
Fixed at v1.6.3

-Tatt
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When we make a polygon by CSG, the moment of inertia becomes strange value.
In the case of the polygon made by subtraction small circle from the big one, the mass becomes a little bit less. But the moment of inertia of it becomes too less against our expectations.

[Paradigm 29]

Here's an example of the same thing, but with a circle and a polygon of nearly identical size.

[niffirg1]

Hhhhmmmmmmmmmmm interesting bug... I wander why?

[yokkun831]

I'm sorry to say that all polygons will have strange value of its moment of inertia.

[davidz40]

That's really serious bug. I can confirm that moments of inertia for circle and square have proper values, so it seems that algorithm for polygons is really messed up.

[Frank]

When you get under the surface, lots of stuff with polygons is screwed up. Better than it used to be, but still bad. Try making gears, stars, or rings with high air friction, then clone and rotate so they're technically at different angles but present the same profile, and watch how the seemingly identical shapes fall at different speeds.

The collisions for polygons aren't that good either. Ever try to use a ring as a wheel?

[kilebantick]

When you get under the surface, lots of stuff with polygons is screwed up. Better than it used to be, but still bad. Try making gears, stars, or rings with high air friction, then clone and rotate so they're technically at different angles but present the same profile, and watch how the seemingly identical shapes fall at different speeds.

The collisions for polygons aren't that good either. Ever try to use a ring as a wheel?

Sure have. Made the car really heavy, it kind of turned into a hover craft.