Update colision bounds of child object

Hi everyone,

I’m trying to create a simple robot simulation using blenders game engine. The Robot consists of simple boxes which are parented to each other. So there is “Body” -> “upper leg” -> “lower leg”. Upper Leg can be rotated with “w” and “s” (motion actuator). However collisions with the ground box are not detected. And movement or collisions are not effecting the Body parent. It seems like the collision bounds are not moving with the mesh.
Anybody an idea how to solve that? I bet it’s just a tick somewhere…
I attached the .blend file so you can have a look at the problem yourself.
Thanks in advace!

Attachments

Main.blend (530 KB)

Found a solution using the Rigid Body Constraint “Hinge”. But now i experience a different problem. The motion actuator does of course not apply the force in the hinge.

Is there a way to apply torque or Angular velocity to Rigid Body Constraints?

Attachments

Main.blend (538 KB)