Simulating a Weighted Die? I'm looking to create an animation wherein a large number of 6-sided Dice almost all roll with the 1 side facing up.  I'm attempting to do so with Rigid Body Physics.

My first attempt was to move the Origin of each die closer to the 6 Face, thus moving it's center of mass... Unfortunately, this causes a very unnatural looking rolling animation (it seems to actually roll around a fictional die that is centered on the Origin, causing it to roll through space or clip into things at times).

I'm wondering if there's another approach that would allow me to more heavily weight a specific part of an object so that it's more likely to come to a rest with that side facing downward?

Note that I'm looking to simply simulate very unlucky dice, not to actually simulate the way that weighted dice would actually roll - I'd like the roll to appear natural, but just end on a 1 more often than not.
Yes

By adding an extra rigid body constrained inside the die as a weight, you can do this:


Add a small object to act as the weight (e.g. an icosphere) and position it inside the die on the opposite side of the 6. Make it a dynamic rigid body and adjust the mass as needed:


Add a Fixed rigid body constraint connecting the weight to the die.


Select the weight and then the die (so that the die is active).
Press Connect in 3D view > Tool Shelf (T) > Rigid Body Tools.
Ensure that the Type is set to Fixed:



With the newly created constraint empty selected, make sure collisions between the weight and the die are disabled:


Make a simulation and be amazed as you roll 6 every time ;)



I know.. I misread your question and thought you wanted lucky dice, but obviously this technique works for simulating unlucky dice too.