Setting Orientation of a plane alongside a normal?

Software: Away3D 4.x
sentoplene, Newbie
Posted: 31 July 2013 12:43 PM   Total Posts: 25

Hi, I have a little problem…

I have already something set up where I read the normal of where I am with my mouse on a mesh…

But now I want to set the orientation of a plane alongside the normal, and I don’t know how to get there.

I think I need to do something with eulers and quaternions, but this is still a bit abacadabra for me.

This is my code:

private function handleMouseMove( event:MouseEvent3D ):void 
{
 _mouseUV = event.uv;

 // Update tracers.
 _locationTracer.position = event.localPosition;
 _normalTracer.position = _locationTracer.position;
 _iconPlane.position = _locationTracer.position;
 var normal:Vector3D = event.localNormal.clone();
 normal.scaleBy( 50 );
   
 var lineSegment:LineSegment = _normalTracer.getSegment( 0 ) as LineSegment;
 lineSegment.end = normal.clone();
 
 // here I want to set the _iconPlane alongside the normal, so in a 90 degrees angle of the hovered face
} 
   
Avatar
GoroMatsumoto, Sr. Member
Posted: 31 July 2013 04:07 PM   Total Posts: 166   [ # 1 ]

You can get degrees for rotating on each axis from “Math.atan2”.

//rotationX:
var radX:Number = Math.atan2(normal.y, normal.z);
var degX:Number = rad / Math.PI * 180;

//rotationY:
var radY:Number = Math.atan2(normal.z, normal.x);
var degY:Number = rad / Math.PI * 180;

//rotationZ:
var radZ:Number = Math.atan2(normal.y, normal.x);
var degZ:Number = rad / Math.PI * 180; 

I’m not sure that this code works correctly.
Please try it wink

Cheers.

   
beers, Member
Posted: 31 July 2013 05:27 PM   Total Posts: 53   [ # 2 ]

I’m lazy so I would just use a lookAt function. Copy the plane position to a vector3D, then add the normal to the vector3D, then use the lookAt function on your plane to aim it at the vector3D

beers

   
 
   
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