problem with gravity and collision

[spoderman]

Hey Guys,

 

i couldnt get collision or gravity working. did i missed something?

edit:

http://www.babylonjs-playground.com/#M3AQS%230

 

[GameMonetize]

hello!

do you mind creating a little playground to help yu helping you?

[GameMonetize]

Oh and btw: you have to move your object with mesh.moveWithCollisions function: http://doc.babylonjs.com/tutorials/Cameras,_Mesh_Collisions_and_Gravity

[spoderman]

here's the Playground. Verry good idea

 

http://www.babylonjs-playground.com/#M3AQS#0

[spoderman]

Is there any way to move in local direction with moveWithCollisions() ?

Why is the gravity not working?

 

[GameMonetize]

You can convert world translation into local translation using inverse of mesh.worldMatrix

Gravity needs to be applied manulay (calling moveWithCollisions using gravity vector from scene)

[spoderman]

Ah, ok. thank you

 

[spoderman]

Hey Deltakosh, can you please explain to me how moveWithCollisions() works with mehs.worldMatrix? I am sorry, i'am just a stupid 3D Artist

 

Wha do you mean with applying the gravity manualy? should i move a mesh via code downwards?

[GameMonetize]

So applying gravity manually: mesh.moveWithCollisions(gravityVector). Usually gravityVector = scene.gravity

if you want to move a mesh along a localDirection just do mesh.moveWithCollisions(BABYLON.Vector3.transformCoordinates(direction, mesh.getWorldMatrix())

 

[spoderman]

i tried this:

http://www.babylonjs-playground.com/#2HZMUG#4

but the sphere only moves up verry fast... no mater what i do

[spoderman]

nobody?

[GameMonetize]

Hello!

It was my mistake. The direction has to be transformed with TransformNormal: http://www.babylonjs-playground.com/#2HZMUG#5

 

Sorry about that

[spoderman]

no problem, thanks a lot, man

 

just for my better understanding. is this a probber way, for example, moving a player and NPC's  arround in a level?

 

[GameMonetize]

You can use exactly the code you have

[spoderman]

ok, one last question

 

i'am not if i get the gravity thing correct. from other engine(s) i usualy know  a process like thie: aktivate gravity, adding gravity to an object and it will keep falling down as long as the scene is running. if  i add a collider it will fall until it hits another collider.

 

why i have to move a object, in babylon, manualy down? isn't this making the gravity property a little useless or just i didnt get it right?

 

if i'am thinking a little further and i would like to make a player 'jumping' ... would this be a point where i have to use a real physicengine?

[GameMonetize]

Beware here: this will work if you enable the physics engine (plenty of great articles about it in our documentation)

The collision system is a lightweight system that you have to use manually. It is faster than the physics engine but less flexible and precise. It's basically the system used by the FreeCamera to simulate collisions with environment

[spoderman]

Ok, thank you delta!