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  JBox2d: set fixture mass  (Read 941 times)
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Offline deepthought
« Posted 2012-12-20 01:48:39 »

does anyone know how to set the mass of a fixture in jbox2d? the only way i found is to set the density, and the engine sets the mass based on density and area. how can i just set the mass if i already know it?
Thanks!

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Offline deepthought
« Reply #1 - Posted 2013-01-03 05:10:15 »

I think if I subclass polygon shape and override set mass I can do it that way, but how do I figure out mass data.I and the centroid?

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Offline matheus23

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« Reply #2 - Posted 2013-01-03 10:30:51 »

No! Cheesy
Use
Body#setMassData(massData);
, and then use a
new MassData()
and set it's
massData.mass
value. But mind, that you also need to know the center of mass.

I suggest simply using density Wink

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Offline deepthought
« Reply #3 - Posted 2013-01-03 23:16:41 »

The problem is that the mass of my entities is not related to their area.
I'll probably copy the area code and put it in a getarea()  function then divide the ass by area to set density.

jocks rule the highschools. GEEKS RULE THE WORLD MWAHAHAHA!!
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