Re: Howto sample a curve?

If you need a PV3D curve, you can use the attached Bezier3D class. It
uses multiple Line3D instances (default segmentation is 10) to simulate
a quadric bezier curve, giving you pretty much the drawing API's
curveTo() functionality in 3D. Usage is, i hope, quite self-explanatory :D

It will also explain you how segmentation is done - just look at the
build() method. If you want to change the shape of Bezier3D run-time
(changing properties than calling rebuild() method), you should also
edit Lines3D class from PV3D and replace it's removeLine() method
because it doesn't remove vertices when removing a line. Replace the
removeLine() method with something like:

        public function removeLine(line:Line3D):void
        {
            var lineindex : int = lines.indexOf(line);
            if(lineindex>-1)
            {
                var vertices:Array = geometry.vertices;
                var c_v0:int = vertices.indexOf(line.v0);
                if(c_v0 != -1) vertices.splice(c_v0, 1);
                var c_v1:int = vertices.indexOf(line.v1);
                if(c_v1 != -1) vertices.splice(c_v1, 1);

                lines.splice(lineindex,1);  
            }
            else if(Papervision3D.VERBOSE)
            {
                trace("Papervision3D Lines3D.removeLine : WARNING
removal of non-existant line attempted. ");

            }
        }

That should do the trick... Until I finish my Graphics3D extension for
PV3D :)

Cheers...


Tim Knip wrote:

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