Collision From Bounding Box

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Here is an example project:
https://playcanvas.com/project/1155525/overview/bounding-box-collider

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const bb = new pc.BoundingBox();
const renders = this.entity.findComponents('render');

const min = new pc.Vec3();
const max = new pc.Vec3();

for (const render of renders) {
    const aabb = render.meshInstances[0].aabb;

    const imin = aabb.getMin();
    const imax = aabb.getMax();

    min.min(imin);
    max.max(imax);
}

bb.setMinMax(min, max);

const t = this.entity.getWorldTransform().clone().invert();
const center = bb.center.clone();

t.transformPoint(center, center);

this.entity.addComponent('collision', {
    halfExtents: bb.halfExtents,
    linearOffset: center
});