Turning an Model to face the direction it is moving

[Eric]

Does anyone have some insight on turning a model using the command AddBodyTorque to point in the direction the Model is moving.

 

Thanks for any help,

Eric

[cassius]

RotateEntity?

Is it your main character. More info would help.

[Josh]

Use this to calculate the omega (rotational velocity) then multiply that by the mass to get the torque you need:

http://www.leadwerks.com/werkspace/page/Documentation/le2/_/command-reference/bodies/calcbodyomega-r52

[Eric]

Yes I'm looking at those commands but what I can't figure out is what to put in the CalcbodyOmega Rotation field .... If I am applying a force and my Model starts to move, how do I know what information to enter in the rotation vector to make sure it points in the direction of movement?

 

Thanks,

Eric

[DaDonik]

The easiest way is to have two TPivot's that you use to get the desired rotation.

Position one pivot right where your model is and the other at the place you want to look at.

Let the first pivot point at the second one and then get the rotation from your first pivot.

Now use that rotation in CalcBodyOmega and you are done.

[Josh]

Is this a character walking? If so, I would use the character controller.

 

If the model only rotates on the XZ plane, an ATan2 operation will get the yaw angle from a normalized vector.

[Eric]

Ok once I have the Yaw Angle.. Which I Do... How do I use the AddBodyTorque and CalcBodyOmega to turn the Model only on the Y Axis to face the calculated Yaw Angle...

 

Nothing I seem to Try Works

float Angle=atan2(Position.X-PreviousPos.X,Position.Z-PreviousPos.Z) * 180 / PI;
AddBodyTorque(Model,CalcBodyOmega(Model,Vec3(0,Angle,0))*ModelMass,0);

 

This is my latest try...but I'm getting something wrong.

 

Is this the right way to Apply Torque only on the Y axis?

 

Thanks,

Eric

[Eric]

Got it... Whew!!

 

AddBodyTorque(Model,Vec3(0,CalcBodyOmega(Model,Vec3(0,Angle,0)).Y*10000,0),0);