[away3d] [Fault] exception, information=Error: isNaN(sz)

[dapdap]

Hi Guys,

I'm making an Augmented Reality game.
I'm using Flartoolkit from FlarManager 2.5.2
Also Away3d tags\3.5.0

It runs fine most of the time but occasionally I get the error
[Fault] exception, information=Error: isNaN(sz)

This is occuring in ZoomFocusLens.as which is called using
setTransformMatrix with the positional data of a Marker/FLARBaseNode

**********************************************************************************************************

        /** @private */
                arcane override function project(viewTransform:MatrixAway3D,
vertices:Array, screenVertices:Array):void
        {
                _length = 0;

                for each (_vertex in vertices) {

                        _vx = _vertex.x;
                        _vy = _vertex.y;
                        _vz = _vertex.z;

                    _sz = _vx * viewTransform.szx + _vy * viewTransform.szy +
_vz * viewTransform.szz + viewTransform.tz;

                    if (isNaN(_sz))
                        throw new Error("isNaN(sz)");

*****************************************************************************************************************

I've set up a routine that checks the data before I send it to ensure
everything is a Number.
So the problem shouldn't be with MatrixAway3D.
This would suggest that somehow the vertices:Array occasionally has
data that is not numerical?

If so - how would that happen?

At the moment I'm very stumped.

I think (though I need to check more) that it works okay with 3.4.2

I'm certainly no powerhouse when it comes to AS3 so any help/
suggestions would be very gratefully received

Cheers

D