Entity picking without physics on the rotated cube doesn't work

Help & Support
#1

Hi ,
I have more than 100 cubes in my scene
I have to be able to select each one with Mouse
But adding rigidbody to this number of cubes and using raycast to select them , reduced the fps on lower devices
I want to use this project, to do this without rigidbody and physics

But when I rotate the cubes, this code again takes into account the cube that did not rotate

I even changed the code using this solution

BoundingBoxShape.prototype.initialize = function () {
    // Create the AABB and move the position of the box by the offset
    this.aabb = new pc.BoundingBox(this.entity.getPosition(), this.halfExtents);
};

BoundingBoxShape.prototype.postInitialize = function () {


    this.app.fire("shapepicker:add", this.entity, this.aabb);
};

BoundingBoxShape.prototype.postUpdate = function (dt) {
    this.aabb.center.copy(this.entity.getPosition());
    this.aabb.halfExtents.copy(this.halfExtents);

    this.aabb = this.entity.render.meshInstances[0].aabb;

};

But it does not work properly when rotating the cubes

#2

pc.BoundingBox is an axis aligned bounding box so it’s not designed to be rotated. You would want pc.OrientedBox instead where you updated the world transform every frame: OrientedBox | PlayCanvas API Reference

So it be something like this (untested):

var transform = new pc.Mat4().setTRS(this.entity.getPosition(), this.entity.getRotation(), pc.Vec3.ONE);
var extents = this.entity.getLocalScale().clone().mulScalar(0.5);

this.box = new pc.OrientedBox(transform, extents);

// Then update it every frame
this.box.worldTransform.setTRS(this.entity.getPosition(), this.entity.getRotation(), pc.Vec3.ONE);
1 Like