Rotation question

[fenomas]

I deleted the workaround and if you use WASD you see the front wheels don't move with the car

 

Dunno, works for me. Clear your cache?

 

 

@fenomas

 

main question is this

 

1. rotate x axis ( world or local)

2. rotate y or z axis  ( world or local)

 

how can back to rotation state befor step 1

 

There's no easy way to "undo" Euler angle rotations. That's basically why people use quaternions.  But for things like cars and wheels it's way easier to use multiple meshes and Euler angles (i.e. use mesh.rotation.x, not mesh.rotate(x,y,z)). 

 

 

(Note: I haven't actually used BJS quaternions, I'm just assuming they work in the standard way.)

[darcome]

yeah!!!! It works!

 

I think I only had to press F5!!!

 

Thank you very much Fenomas! In he end your suggestion of using a container works like a charm!!

 

Thank you again!

[jerome]

Reviewing your PG, I am wondering if there is a simpler way to do.

Imho, the problem is you don't apply local rotations the same way each time (remember : rotations aren't commutative) :

- once only X, once only Z, depending upon the key pressed event

 

I would test this :

 

first, set two var rotationX and rotationZ

 

then in the render loop :

check keys, set two rotation deltas X and Z, this deltas can be zero if nothing pressed

then systematically :

rotationZ += deltaZ

rotationX += deltaX

then systematically rotate the mesh both on Z then X

torus.rotation.z = rotationZ;

torus.rotation.x = rotationX;

 

it should work imho with no parent intermediate mesh

[fenomas]

Jerome, when you use euler angles (rotation.x/y/z) you don't have to track state that way. Conceptually, each mesh starts each frame in an unrotated state and then BJS applies its rotation.x/y/z values in some given order. So it doesn't matter when/how you set the values. As for the intermediate mesh, it's there to let you control the order in which the wheel's rotations are applied, You might get by without it if the order you need happens to be the order BJS uses, but in general you need an intermediary. (unless you're using quaternions)

[jerome]

ok

 

I guess the BJS engine has its own order and doesn't respect any user order ... so my solution wasn't good

you're right

 

let's go on with quaternions or intermediate mesh 

[NasimiAsl]

: http://www.babylonjs...d.com/#1PM4XG#8

 

 

realy ? r u checked this for best answerd  in this solution box is not rotate !!

 

cannonjs is fix that . http://schteppe.gith...gidVehicle.html  

[darcome]

I checked it because what fenomas writes in that post is the correct answer: I have to use a container mesh

 

Even if the PG doesn't seem to work