[Papervision3D] Getting Mouse Click Coordinates in Away3D

[Alexander Zadorozhny]

Hi Mike

Actually in MouseEvent3D you already have the worldX, worldY and
worldZ coordinates
http://away3d.com/docs/away3d/core/scene/MouseEvent3D.html#worldX

And in Camera3D class there's a method
       public function screen(object:Object3D, vertex:Vertex =
null):ScreenVertex
that converts object's 3d coordinates to the screen coordinates.
http://away3d.com/docs/away3d/core/scene/Camera3D.html#screen()

wbr,
Alexander

On 7/16/07, Mike Pearson <gmp26 at cam.ac.uk> wrote:
> John,
>
> This probably won't help you but it's useful for some apps anyway - e.g.
> http://nrich.maths.org/public/viewer.php?obj_id=5646
>
> It depends on Away3D's MouseEvent3D which gives you u,v
> coordinates of the mouse click. This code then calculates the x,y,z
> of the mouse pointer in object space as a linear combination of the
> vertices of the face you clicked on.
>
>      public function onGlobeMouseDown(e:MouseEvent3D):void
>      {
>      	var f:Face3D = (e.drawpri as DrawTriangle).face;
>      	if(f==null) return;
>
>      	var fv0:Number3D = f.v0;
>      	var fv1:Number3D = f.v1;
>      	var fv2:Number3D = f.v2;
>      	var m:Matrix3D = new Matrix3D();
>      	m.n11 = f.uv0.u;
>      	m.n12 = f.uv1.u;
>      	m.n13 = f.uv2.u;
>     	m.n21 = f.uv0.v;
>       	m.n22 = f.uv1.v;
>       	m.n23 = f.uv2.v;
>    	m.n31 = 1;
>       	m.n32 = 1;
>      	m.n33 = 1;
> 	var a:Number3D = new Number3D(e.uv.u, e.uv.v, 1).rotate
> (Matrix3D.inverse(m));
> 	var b:Number = a.x + a.y + a.z;
>
> 	// Calculate approximate object coordinates of mouse.
> 	var obj:Number3D = new Number3D();
> 	obj.x = (a.x*fv0.x + a.y*fv1.x + a.z*fv2.x)/b;
> 	obj.y = (a.x*fv0.y + a.y*fv1.y + a.z*fv2.y)/b;
> 	obj.z = (a.x*fv0.z + a.y*fv1.z + a.z*fv2.z)/b;
> 	...
>    }
>
> --
> Mike Pearson
>
> MMP, Centre for Mathematical Sciences,
> Cambridge CB3 0WA
>
>
>
>
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