no way to rotate object globaly

[phil1234]

Hello,

 

I read in the doc that rotation is achieved before translation, but I try to have an offsetted object rotate around the 0,0,0 axis

 

and I cant find any way to achieve this ... 

 

usualy(with other engines) I offset the object on its local axis

then simply rotate it globaly with a matrix/quaterion/rotate function 

 

I tried different combinations of these two

mesh.translate(BABYLON.Axis.X, 3.0, BABYLON.Space.WORLD); //or LOCAL

mesh.rotate(BABYLON.Axis.Y, 1.0, BABYLON.Space.WORLD); //or LOCAL

 

(I wanted to rotate the object position with a quaternion, but the Quaternion lacks of regular/usual .mult(Vector) or .rotate(Vector)

and anyway, it wouldn't be what I want to achieve)

 

any idea ?

 

thanks

[GameMonetize]

You can use mesh.setPivotMatrix(BABYLON.Matrix.Translation(x, y, z) to achieve your goal.

 

the complete operation is PivotMatrix x Scaling x Rotation x Translation

[iiceman]

I guess this example fits Deltakoshs suggestion: http://www.babylonjs-playground.com/#H7V1D#8

 

(if not, just ignore me )

[Wingnut]

Hi phil... (and hi ice and dk too) welcome to the forum.... good to have you with us.

 

In case you ever need such, I have a cool "bootleg" forum searcher page at http://urbanproductions.com/wingy/babylon/search/form06/form06.htm  (thx to Gryff for the gfx).

 

Phil... tell us about you, and your project(s), if you want.  Thanks!

[phil1234]

ok, but although I can make it work with rotate(), how come it does not work doing this

 

mesh.rotationQuaternion=mesh.rotationQuaternion.multiply(BABYLON.Quaternion.RotationAxis(new BABYLON.Vector3(0,1,0),angle*Math.PI/180));

 

[edit: oops my bad it works actualy :-) ]

[Wingnut]

Hi again, Phil.

 

http://www.babylonjs-playground.com/#H7V1D#13

 

Your line is 34.

 

Notice line 33.  Standard mesh do not have a .rotationQuaternion by default.  It is "turned on" as needed.  https://github.com/BabylonJS/Babylon.js/blob/master/src/Mesh/babylon.abstractMesh.js#L227 (that line should look familiar).    Lines 363 and 419 are also testers for the existence of a quaternion. 

 

Hope this helps.  Party on!

[ian]

http://babylonjs-playground.com/#1JUURV#18

 

local vs world rotation example