How to Flip Quaternion With X,Y,Z,W

Questions
4

Shit :frowning:
I tried that:

                tm = this.vehicleController.getWheelTransform(i);
                p = tm.getOrigin();
                q = tm.getRotation();
                this.wheelTransforms[i].position.set(p.x(), p.y(), p.z());
                this.wheelTransforms[i].rotationQuaternion.set(q.x(), q.y(), q.z(), q.w());
                this.wheelTransforms[i].rotationQuaternion.multiplyInPlace(BABYLON.Quaternion.RotationYawPitchRoll(0, Math.PI, 0));

My Wheels are still flipped the wrong way…

Should look like this:

30%20AM
Screen Shot 2019-06-10 at 5.54.30 AM.jpg1151×840 435 KB

But the wheel positions that are getting set from a btTransform i Physics World… flips it to this:

58%20AM
Screen Shot 2019-06-10 at 5.54.58 AM.jpg1460×976 627 KB

I tried the code which should just flip the transform around… but it does not :frowning:

Code is pretty simple… Each Frame…

Iterate wheel info… update the in internal wheel info… get the updated world transform and apply that position and rotation to the actual wheel meshes (TansformNode)… so the wheels can turn and bounces up and down with the suspension handling


    protected after(): void {
        if (this.wheelTransforms != null && this.wheelTransforms.length >= 4) {
            let tm:any, p:any, q:any, i:number;
            const n = this.vehicleController.getNumWheels();
            for (i = 0; i < n; i++) {
                this.vehicleController.updateWheelTransform(i, true);
                tm = this.vehicleController.getWheelTransform(i);
                p = tm.getOrigin();
                q = tm.getRotation();
                this.wheelTransforms[i].position.set(p.x(), p.y(), p.z());
                this.wheelTransforms[i].rotationQuaternion.set(q.x(), q.y(), q.z(), q.w());
                this.wheelTransforms[i].rotationQuaternion.multiplyInPlace(BABYLON.Quaternion.RotationYawPitchRoll(0, Math.PI, 0));
            }
        }
    }