libGDX 3D使用转速系数将ModelInstance旋转到第二个

Question

I'm working on 3D tower defence and I need some help with rotation of a ModelInstance. How to rotate the ModelInstance to the second one with a coefficient of rotation speed.

For example: rotate base(or weapon) to enemy

Thanks for help.

Answer 1

Actually you should never rotate a ModelInstance to face another ModelInstance , but you should rotate it to an angle given by the gamelogic.
That means, that you should sepperate the logic and the view.
In this case the logic needs to store the currentAngle and the desiredAngle , as well as a rotationSpeed .
The desiredAngle can be calculated out of the position s of the Tower and the Enemy .
In the update(delta) you can then say:

if (desiredAngle > currentAngle)
    currentAngle+=rotationSpeed*delta;

The same for the negative rotation and ensure to keep rotation between 0 and 360°.

You can then rotate the ModelInstance to the given currentAngle by rotating its Matrix4 transform , i gues the rotate(float axisX, float axisY, float axisZ, float degrees) should be the rigth one.