ZFX + Developia

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var mX:Number = -1 + (p.x / winSize.x)  * 2;
        var mY:Number =  1 - (p.y / winSize.y) * 2;
     
        var farPos:Vector3D = new Vector3D( mX, mY,  1.0, 1.0 );
        var nearPos:Vector3D = new Vector3D( mX, mY, 0.0, 1.0 );
         
        var mt:Matrix3D = new Matrix3D();
        mt.append(getProjection());
        mt.append(getView());
        mt.invert();
         
        nearPos = mt.transformVector(nearPos);
        farPos = mt.transformVector(farPos);
         
        nearPos.scaleBy(1.0 / nearPos.w);
        farPos.scaleBy(1.0 / farPos.w);
         
        var Dir:Vector3D = farPos.subtract(nearPos);
        Dir.normalize();
 
        return new CRay(nearPos, Dir);

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return new CRay(nearPos.subtract(position.add(Dir))

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public function CRay(orgin:Vector3D,dir:Vector3D) 
		{
			ray_origin = orgin;
			ray_dir = dir;
		}

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	public function intersectRayAABox(ray:CRay, min:CVertex,max:CVertex, tnear:int, tfar:int,t:Number):Boolean
		{
			// r.dir is unit direction vector of ray
			var dirfrac:Vector3D = new Vector3D();
			dirfrac.x = 1.0 / ray.ray_dir.x;
			dirfrac.y = 1.0 / ray.ray_dir.y;
			dirfrac.z = 1.0 / ray.ray_dir.z;
			// lb is the corner of AABB with minimal coordinates - left bottom, rt is maximal corner
			// r.org is origin of ray
			var t1:Number = (min.x - ray.ray_origin.x)*dirfrac.x;
			var t2:Number = (max.x - ray.ray_origin.x)*dirfrac.x;
			var t3:Number = (min.y - ray.ray_origin.y)*dirfrac.y;
			var t4:Number = (max.y - ray.ray_origin.y)*dirfrac.y;
			var t5:Number = (min.z - ray.ray_origin.z)*dirfrac.z;
			var t6:Number = (max.z - ray.ray_origin.z)*dirfrac.z;

			var tmin:Number = Math.max(Math.max(Math.min(t1, t2), Math.min(t3, t4)), Math.min(t5, t6));
			var tmax:Number = Math.min(Math.min(Math.max(t1, t2), Math.max(t3, t4)), Math.max(t5, t6));
	
			// if tmax < 0, ray (line) is intersecting AABB, but whole AABB is behing us
			if (tmax < 0)
			{
				t = tmax;
				return false;
			}

			// if tmin > tmax, ray doesn't intersect AABB
			if (tmin > tmax)
			{
				t = tmax;
				return false;
			}

			t = tmin;
			return true;
		}

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return new CRay(nearPos, Dir);

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return new CRay(nearPos.subtract(position.add(Dir)), Dir);

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	public function ScreenRayToWorld(p:Point, winSize:Point):CRay
		{
			var NEAR:Number = 0.1;
			var FAR:Number = 5000;
			var ASPECT:Number =  winSize.y / winSize.x;
			var WIDTH_DIV_2:int = winSize.x * 0.5;
			
			var dx:Number=Math.tan((45 * Math.PI / 180)*0.5)*(p.x / WIDTH_DIV_2 - 1.0) / ASPECT;
			var dy:Number=Math.tan((45 * Math.PI / 180)*0.5)*(1.0-p.y/(winSize.y * 0.5));
			
			var mt:Matrix3D = new Matrix3D();
			mt.append(getView());
			mt.invert();

			var p1:Vector3D=new Vector3D(dx*NEAR,dy*NEAR,NEAR,1);
			var p2:Vector3D = new Vector3D(dx * FAR, dy * FAR, FAR,1);
			
			p1 = mt.transformVector(p1);
			p2 = mt.transformVector(p2);
			
			var dir:Vector3D = new Vector3D();
			dir = p2.subtract(p1);

			return new CRay(p1,dir);
		}