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Using the answer in "Why don't effectors effect effectors?", it is possible to have rigid body objects interact with each other using force fields. However, I would like to do something similar using charge fields.

If I try using this approach with the charge fields, there does not appear to be any forces applied.

Is it possible to use charge fields with rigid objects? If so, how is it done?

Example:

The animated result using force fields in Blender 2.76:

Balls floating based on forces

This is created using rigid body physics. The cage is a rigid body. Each sphere is a rigid body. An empty is parented to each sphere. Each empty has a force field assigned as shown below.

Blender setup using force fields

If the force field is changed to a charge field, the spheres end up on the bottom of the cage.

Blender setup using charge fields

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    $\begingroup$ Did you have any luck in using charge fields to produce forces between rigid bodies? $\endgroup$
    – Edwin Baldelomar
    Commented Dec 30, 2015 at 5:57

2 Answers 2

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It would seem that there is a paradox going on in the (blender) physics...

from the manual

"Charge It is similar to spherical field except it changes behavior (attract/repulse) based on the effected particles charge field (negative/positive), like real particles with a charge. This mean this field has only effect on particles that have also a Charge field (else, they have no “charge”, and hence are unaffected)!"

Unfortunately this means that charged objects will only affect other charged objects and that giving an object a charge (force/field), turns it into an effector, and therefore does not affect other effectors...

With the field added to an empty, the field will have no effect on the uncharged spheres.

Seems like a bug/glitch/oversight/unintended consequence of the negation of the effectors affecting each other.

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No its not a bug that's how blender is built. What you can do is make it a separate active rigid body and animate it. I have use this method in blender 2.77a, it worked fine except you want to use soft body or cloth simulation which will blow it as you expect.

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