Angular motors with rigid body simulation fail

Support Particles and Physics Simulations
1

Hello! I hope you are doing great!
I’ve tried to put an angular motor to a plane and a cylindrical object, but somehow it does not spin on its own z axis at all. It can work with linear, but when I put it to angular and limit rotations just to the z axis nothing moves no matter the configuration. I’ve tried everything and nothing works out. May you help me? Thank you!
Video support to show what I mean: https://drive.google.com/file/d/1oADGcxlUDmIYA0NtzWpz5KU_JtfAua2H/view?usp=sharing.

Here is the file
Rigid body motor.blend (1.4 MB)

2

I don’t know exactly what I want… :thinking:

Simulation works only when the size of the object is large in the scene.
I think you can grow it to 5 to 10 times the size of the current one.

And look for any information you want in the video below.

https://www.youtube.com/playlist?list=PLbyYlLq2pvAZx37qDnsDBcCw-1CxVVU26

3

Rigid body constraints have a few “catches” you have to be aware of.

A motor constraint e.g. just rotates on one axis (x axis).

“normally” you should apply rotation + scale of all objects in your rb sim to get a good result.

In your special case you blocked all movements except rotation z of object.040. That’s why nothing moves.

image
image686×576 49 KB

If you release all rotational locks, and increase the max impulse to 10 and delete all bakes in rb sim, you will get:

rotational probl

Remember: the z axis of your object doesn’t have to be the same axis as your empty has! I think that’s your false prerequisition you made.

But…i really would apply scale + rotation of your objects, because this WILL make you trouble in the future.