Mesh CheckCollision but pass thru other mesh

Cedric · September 8, 2020, 12:34pm

There are collisionGroup and collisionMask but this will disable collision,

BabylonJS/Babylon.js/blob/4615e200806427600b831e47e773778d4602b363/src/Meshes/abstractMesh.ts#L549


 * @see https://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity

 */

public ellipsoid = new Vector3(0.5, 1, 0.5);

/**

 * Gets or sets the ellipsoid offset used to impersonate this mesh when using collision engine (default is (0, 0, 0))

 * @see https://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity

 */

public ellipsoidOffset = new Vector3(0, 0, 0);



/**

 * Gets or sets a collision mask used to mask collisions (default is -1).

 * A collision between A and B will happen if A.collisionGroup & b.collisionMask !== 0

 */

public get collisionMask(): number {

    return this._meshCollisionData._collisionMask;

}



public set collisionMask(mask: number) {

    this._meshCollisionData._collisionMask = !isNaN(mask) ? mask : -1;

}

To disable collision response, AFAIK, a new flag and test is needed here to move the move whether there is a collision or not:

github.com

BabylonJS/Babylon.js/blob/4615e200806427600b831e47e773778d4602b363/src/Collisions/collisionCoordinator.ts#L71


// if not specified, against all meshes in the scene

var meshes = (excludedMesh && excludedMesh.surroundingMeshes) || this._scene.meshes;



for (var index = 0; index < meshes.length; index++) {

    var mesh = meshes[index];

    if (mesh.isEnabled() && mesh.checkCollisions && mesh.subMeshes && mesh !== excludedMesh && ((collisionMask & mesh.collisionGroup) !== 0)) {

        mesh._checkCollision(collider);

    }

}



if (!collider.collisionFound) {

    position.addToRef(velocity, finalPosition);

    return;

}



if (velocity.x !== 0 || velocity.y !== 0 || velocity.z !== 0) {

    collider._getResponse(position, velocity);

}



if (velocity.length() <= closeDistance) {

    finalPosition.copyFrom(position);

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Mesh CheckCollision but pass thru other mesh

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