[Papervision3D] rotation about some axis

[dsdsdsdsd]

John Brookes posted this at
http://forum.papervision3d.org/viewtopic.php?f=14&t=998

var M : DisplayObject3D = my_DO3D          ;
var X : Number3D         = my_axis             ;
var a : Number            = my_radian_angle  ; 
var P : Number3D         = my_axis_position  ; 
var D : Matrix3D          = new Matrix3D( )   ;
var T : Matrix3D           = M.transform       ;  

//  this acts on individual vertices:
//M.geometry.transformVertices( Matrix3D.multiply(
Matrix3D.rotationMatrixWithReference( X , a , P ) , D  ) ) ; 

// this acts on a DO3D's transform:
M.copyTransform                   ( Matrix3D.multiply(
Matrix3D.rotationMatrixWithReference( X , a , P ), T ) ) ;  




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thanks,

Shannon


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