Is there a way to visualize the physics impostor ?

[altreality]

I do not see any way to draw the box impostor around my mesh(if I am using a box impostor for it) 

 

It helps find out the reason for unexpected collisions some times.

 

Would it make sense to automatically create a physics mesh when  setPhysicsState()is called ?  Maybe maintain a reference to this mesh in a member of AbstractMesh like _physicsMesh ?

      

 AbstractMesh.prototype.setPhysicsState = function (impostor, options) {            var physicsEngine = this.getScene().getPhysicsEngine();            if (!physicsEngine) {                return;            }            if (impostor.impostor) {                               options = impostor;                impostor = impostor.impostor;            }            impostor = impostor || BABYLON.PhysicsEngine.NoImpostor;            if (impostor === BABYLON.PhysicsEngine.NoImpostor) {                physicsEngine._unregisterMesh(this);                return;            }            options.mass = options.mass || 0;            options.friction = options.friction || 0.2;            options.restitution = options.restitution || 0.9;            this._physicImpostor = impostor;            this._physicsMass = options.mass;            this._physicsFriction = options.friction;            this._physicRestitution = options.restitution;            this._physicsMesh = createDownSampledPhysicsMesh(); <----------------------------------------------            return physicsEngine._registerMesh(this, impostor, options);        };

This _physicsMesh member too is then updated by the physics plugin inside :

CannonJSPlugin.prototype.runOneStep = function (delta) {            this._world.step(delta);            for (var index = 0; index < this._registeredMeshes.length; index++) {                var registeredMesh = this._registeredMeshes[index];                if (registeredMesh.isChild) {                    continue;                }                // Body position                var bodyX = registeredMesh.body.position.x, bodyY = registeredMesh.body.position.y, bodyZ = registeredMesh.body.position.z;                // _physicsMesh should not use delta, its a faithful copy of the body's position inside the physics engine                registeredMesh.mesh._physicsMesh.position.x = bodyX ;                registeredMesh.mesh._physicsMesh.position.y = bodyZ ;   // flip Y & Z to account for handedness, apparently this is enough                registeredMesh.mesh._physicsMesh.position.z = bodyY ;                var deltaPos = registeredMesh.delta;                if (deltaPos) {                    registeredMesh.mesh.position.x = bodyX + deltaPos.x;                    registeredMesh.mesh.position.y = bodyZ + deltaPos.y;                    registeredMesh.mesh.position.z = bodyY + deltaPos.z;                                    } else {                    registeredMesh.mesh.position.x = bodyX;                    registeredMesh.mesh.position.y = bodyZ;                    registeredMesh.mesh.position.z = bodyY;                }                if (!registeredMesh.mesh.rotationQuaternion) {                    registeredMesh.mesh.rotationQuaternion = new BABYLON.Quaternion(0, 0, 0, 1);                }                registeredMesh.mesh.rotationQuaternion.x = registeredMesh.body.quaternion.x;                registeredMesh.mesh.rotationQuaternion.y = registeredMesh.body.quaternion.z;                registeredMesh.mesh.rotationQuaternion.z = registeredMesh.body.quaternion.y;                registeredMesh.mesh.rotationQuaternion.w = -registeredMesh.body.quaternion.w;            }        };

_physicsMesh can be created only when the user requests physics draw.

[davrous]

Hello,

We don't have an embedded way to do it in our engine. Still, it m's very easy to do it by code like I've explained in this article: http://blogs.msdn.com/b/davrous/archive/2014/11/18/understanding-collisions-amp-physics-by-building-a-cool-webgl-babylon-js-demo-with-oimo-js.aspx

Bye,

David

[altreality]

Thanks David. 

[GameMonetize]

What about displaying bounding boxes? mesh.showBoundingBox = true

[altreality]

Yeah that would work too