solved [SOLVED] How to set a mesh position before render?

[brucewong21]

https://www.babylonjs-playground.com/#4HUQQ#207

Hello again,
I'm trying to figure out how to check for collisions using intersectsMesh method.
The problem is that when I start my scene, the intersectsMesh callback is called since I believe the meshes start at the origin point of the world on the first render before they are moved.

The PG above demonstrates the problem. If you open up the browser's developer console, you would see "SHOULDNT HAPPEN" when the mesh intersections occurred. Any tips on how to prevent this problem? Thank you!

[mr_pinc]

The Scene object has a few observables you can use

 

https://www.babylonjs-playground.com/#4HUQQ#208

[RaananW]

To prevent the "shouldn't happen", compute the anotherBox's world matrix again, to make sure its position is updated internally as well : https://www.babylonjs-playground.com/#4HUQQ#209

** Note - this is a relatively "expensive" task, don't overuse computeWorldMatrix . 

[brucewong21]

Thanks for your suggestions guys. I like the computeWorldMatrix idea since it works more along my game flow. I ended up computing the world matrix for my ground object so that it is lower than the world origin so that nothing will intersect it. If I wanted to add walls and such however, those will still intersect my enemies before they're rendered into the world. Is there a solution to this problem that I'm not aware of or how can I use the camera method with my game render loop logic? Thank you everyone.

    engine.runRenderLoop(function(){
      MapManager.update();
      MonsterManager.update();
      WeaponsManager.update();
      ProjectileManager.update();
      cambox.position = camera.position;
      cambox.rotation = camera.rotation;
      scene.render();
    });