Combining Quaternion Slerp tilt with Rotation around Y axis

Questions & Answers
1

I am trying to simulate the movement of a spinning top, with tilt and spin.
I have this tilt rotation set up, and it works perfectly:

float maxVel = 20f;
        float vel_X = Mathf.Clamp(rb.velocity.z, -maxVel, maxVel); //clamping the values
        float vel_Z = Mathf.Clamp(-rb.velocity.x, -maxVel, maxVel); //for some reason, these values only work inverted like this
        vel_X = vel_X / maxVel; //making it a percentage of the maxVelocity;
        vel_Z = vel_Z / maxVel; //making it a percentage of the maxVelocity;
        Quaternion target = Quaternion.Euler(vel_X * maxTilt, 0, vel_Z * maxTilt);
        targetTilted.transform.rotation = Quaternion.Slerp(targetTilted.transform.rotation, target, Time.deltaTime * smooth);

The object tilts in the same direction as my analogue stick.

However, I also want to add a spin rotation, around the Y-axis. But I haven’t been able to. One rotation breaks the other.

Thank you in advance for any help.

2

Is this going in the direction you want?

	void Update () {
        
        float maxVel = 30f;
        float vel_y = 40f;
        float vel_X = Mathf.Clamp(rb.velocity.z, -maxVel, maxVel); //clamping the values
        float vel_Z = Mathf.Clamp(-rb.velocity.x, -maxVel, maxVel); //for some reason, these values only work inverted like this
        vel_X = vel_X / maxVel; //making it a percentage of the maxVelocity;
        vel_Z = vel_Z / maxVel; //making it a percentage of the maxVelocity;
        targetTilted.transform.Rotate(Vector3.up * 30);
        vel_y = targetTilted.transform.rotation.y;
        Quaternion target = Quaternion.Euler(vel_X * maxTilt, vel_y, vel_Z * maxTilt);
        targetTilted.transform.rotation = Quaternion.Slerp(targetTilted.transform.rotation, target, Time.deltaTime);
        targetTilted.transform.Rotate(Vector3.up, Time.deltaTime*30);
    }

This shows spin at the local y axis assuming the centre of the objects is placed correctly. It worked for me using a deformed sphere. But maybe you are looking for something different?