Always keep body (cylinder) upright

[Ywa]

Hi there,

 

I'm trying to keep a body (cylinder in this case) upright while being able to set the velocity & change Y-rotation.

 

I tried to set the X & Z-axis to 0.0 every frame. This kinda worked, however, setting the velocity caused weird effects like sudden slowdowns.

Setting the center of mass real low (0.0 -50.0 0.0) didn't help anything.

 

The reason I want to keep it upright is to mimic controller functionality (control it as a player).

 

Who can help me with this?

 

Thanks in advance.

[Canardia]

Something like this should work:

SetBodyOmega(barrelmodel,CalcBodyOmega(barrelmodel,Vec3(0,GetEntityRotation(barrelmodel).Y,0));

[Josh]

There's a function to calculate the omega (angular velocity) needed to move a body to a specific rotation. Use this and multiply it by the mass to get the torque (angular force) you need.

[Ywa]

I tried Metatron's suggestion. Didn't work.

 

Josh, this code doesn't work either (called every frame), either nothing or alot of Y-rotating happens. 50.0 is the mass.

SetBodyTorque(vBody.Entity,(CalcBodyOmega(vBody.Entity,Vec3D(0,fCameraAngleY,0))*50.0),1);

 

How did you solve this issue in your controller-class?

[Josh]

The controller does not use the physics simulator. It has a simplified system to control things in an unrealistic way that is better for gameplay. The problem is adding torque to force something upright will always have unintended effects that are felt elsewhere, like when standing on ramps.

[Ywa]

I remember you posted it's sourcecode (of that class, together with the vehicle-class). But I can't find them on the forums anymore.

Do you want to republish them? Could come in handy, even though I'm aware it doesn't use the simulator.