Issue with intersecting meshes on initialization

[cnjlemm]

I am new to babylon and am creating a space game based on gravity and mesh intersection. Basically, my game states are being managing and determined based on if a ship mesh is intersecting with a destination or obstacle mesh. Looks something like this:

 

  scene.registerBeforeRender(function()

  {  

    if (ship.canvasObject.intersectsMesh(canvasObjects[0].canvasObject, true)) {

      ship.material.emissiveColor = new BABYLON.Color3(0, 1, 0);

      PubSub.publish('COLLISION EVENT', 'collided')      

    }

 

    for(var i = 1; i < canvasObjects.length; i ++){

      if (ship.canvasObject.intersectsMesh(canvasObjects.canvasObject, true)) {

        ship.material.emissiveColor = new BABYLON.Color3(1, 0, 0);

        PubSub.publish('COLLISION EVENT', 'collided with other stuffs')

      }

    }

 

Where ship is a prototype. When the page loads, it says that the meshes are already intersecting once, then they stop intersecting, and then they intersect again. The positions of each are (-20, 1, -20) and (25, 1, 25). I feel like there's something simple-ish here that I'm missing and I've gone through all the docs but can't figure it out. 

 

Any help appreciated!

[Temechon]

Hello, 

 

When you update the position, actually nothing is done by Babylon: mesh positions are not *really* updated. 

Positions are updated when the world matrix of the mesh is updated: this step is done at the very first render.

That's why you have this behaviour: 

- collision at first frame

- render

- world matrix updated

- no more collision

 

To fix your issue, you have to force the first update of the world matrix, like this: 

myMesh.computeWorldMatrix(true);