Hi Everyone!

I tried to code an Augmented Reality application with flartoolkit and PV3D. In my application I tried to locate a DAE model to markers plane according to my mouse click. For this, I use the “unprojected methot” to get intersection point of my mouse click and the plane. But for getting the intersection point I needed to get the normal of the plane as seen on this codes:

var ray:Number3D = flarCamera3D.unproject(mouse.x,mouse.y);
var p:Plane3D = new Plane3D();
var normal: Number3D = I DONT KNOW HOW TO FIND??
p.setNormalAndPoint(normal, markerPosition);
var intersect:Number3D = p.getIntersectionLineNumbers(flarCamera3D.position, ray);

But I could’nt achieve to get the normal of the plane. So I decided to observe AWAY3D. Can I find the normal vector of this plane with AWAY3D?

Thanks alot.
Erdem.

I believe this is what you’re looking for: http://blog.inspirit.ru/

Eugene is a master at computer vision and augmented reality and many of his articles have source code. I’m quite sure he uses Away3D 4.x for his latest experiments.

If all you need to do is to find the normal of a plane, you can just calculate it using the cross product of two of the plane’s vertices, using a third as reference.

normal = (v2-v0) x (v1-v0)

This is a standard equation to calculate a face’s normal vector. Since a plane is flat, the normal of the entire plane is parallel to the normals for the individual faces.