Loading object and cloning with collisions

Questions
1

I have an object with like 40 meshes in it, which I am loading using AssetsManager

const assetsManager = new BABYLON.AssetsManager(scene);
const meshTask = assetsManager.addMeshTask('part_of_wall', '', './assets/', 'part_of_wall.obj');
meshTask.onSuccess = (task) => {
   task.loadedMeshes.forEach(function(e) { e.checkCollisions = true;});
}
assetsManager.load();

I have couple of things to accomblish with this object.

  1. Copy 10 times of object and repeat in Z position to create a long wall.
    I found that I could use Use Instances - Babylon.js Documentation, so I copied _addInstance function to create multiple copies

    var _addInstance = function (m,n,x,y,z){
    var i= m.createInstance(n);
    i.position.x = x||0;
    i.position.y = y||0;
    i.position.z = z||0;
    return i;
 }

but how can I copy whole object and repeat in Z position, instead going in loop and copying each mesh.

  1. Add collisions detection
    to accomplish collision detection, in above code I added a loop
    task.loadedMeshes.forEach(function(e) { e.checkCollisions = true;});

but its not very efficient , is there a way to add collision to whole object instead each mesh?

2

ok , I was able to accomplish copying by merging meshes:

let part_of_wall = BABYLON.Mesh.MergeMeshes(task.loadedMeshes);
part_of_wall.checkCollisions = true;
part_of_wall.isVisible = false;
_addInstance(part_of_wall,'root')
_addInstance(part_of_wall,'0',0,0,1523)

but for collisions, there are holes on wall so I am still looking for solution to collision, to not cross the wall

3

Could you reproduce the issue in the playground as it might definitely help the community addressing the issue ?

4

I have created a PG here:
https://www.babylonjs-playground.com/#4DAIHA#2

I am able to create long wall by using instance in _addInstance function, I have issue with collision, there are holes in wall so I am able to cross the wall. I want to stop this behaviour happening and keep the player inside of wall.

5

Unfortunately collisions will be very expensive if you use the real object
Furthermore they are only working for convex objects

I would recommend to use an impostor (a simple invisible boxe or multiple boxes). This is what most of the games do for instance

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6

Thank you once again, I successfully created a cube in front of wall and only applied collisions to it.

https://www.babylonjs-playground.com/#4DAIHA#4

1 Like