[SOLVED] How to Do AttachConstraint?

[Zhichao]

Hi @Hugo and Sofa users,
I am trying to attach an actuator to a body using attach constraint. I set 4 pairs of vertex in the attach constraint, and gave the body a relatively large stiffness. However, the attaching points fell apart from the body as if the body was too soft.
Could you help figure it out?


My code can be found here https://www.dropbox.com/sh/1strpel1kv7oi4o/AAB2EjZDvW3Z2CSSABEz80bza?dl=0.

Thanks.

[Hugo]

HI @zliu157

Two things came to my mind:
– first what are your units, what is the dimension of your mesh?
– regarding the Attach constraint, you should activate the option twoWay : if you want to the attach constraint to propagate forces on both objects.

Best

Hugo

[Binesh]

Hi @zliu157
how do you move your actuator?
if you overwrite your position data of actuator dof, you ignore scene solving,
you can use a spring between actuator reference and actuator dof and move the actuator with force and finally use attach constraint with twoway

Best

Behnam Binesh

[Author]

Posts