solved Intersecting mesh with BABYLON.Ray from VR Controller

[PavolHejný]

Hi,

I am using Babylon.js with HTC Vive and WebVR and I want to pick a point on the mesh (this.wallMesh) with controller ray. I don't want to use default VRHelper interactions.

I expected that this code should work for it but it seems that there is wrong rotation because the rotation of the device behaves totally weird.

Do you have some tips on how to fix it? Thank you a lot.

const pickMesh = BABYLON.Mesh.CreateSphere(
    'pickMesh',
    5,
    0.1,
    this.scene,
);

const ray = new BABYLON.Ray(
    BABYLON.Vector3.Zero(),
    BABYLON.Vector3.One(),
    100,
);

this.scene.registerAfterRender(() => {

    ray.origin = controller.devicePosition;
    ray.direction = controller.deviceRotationQuaternion.toEulerAngles();

    const hit = this.wallMesh!
        .getScene()
        .pickWithRay(ray, (mesh) => mesh === this.wallMesh);

    if (hit) {
        console.log(hit.hit);

        if (hit.pickedPoint) {
            pickMesh.position = hit.pickedPoint;
        }
    }

});

 

 

 

[Guest]

Pinging @trevordev

[trevordev]

Hey @PavolHejný, from a quick look
ray.direction = controller.deviceRotationQuaternion.toEulerAngles();

looks incorrect, instead to get a direction for your ray you can rotate a forward vector by your rotation quaternion.

var m = new BABYLON.Matrix();
controller.deviceRotationQuaternion.toRotationMatrix(m);
var direction = Vector3.TransformCoordinates(BABYLON.Vector3.Forward(), m);

Let me know if that doesn't work.

[PavolHejný]

@trevordev

Thanks a lot. Your code is working perfectly!