TriangleArray Newbie Question

Engines, Libraries and Tools Xith3D Forums
#1

Hello Xith folks!

I’m quite new to Xith and 3D programming in general so hopefully this is an easy problem - i’m begin to have headaches from it… =/

i have written a simple .SWF importer that reads all vector shape data from a macromedia flash file and creates shape3d objects from it that are then displayed.

it works quite flawless except this one problem:
the resulting trianglestrips dont look at all like the vectorshapes they originate from.

i know this is a triangulation problem and has something to do with the order in which the vertex-points are passed to the trianglestriparray

  • but that is exactly what i cant figure out =/
    in the macromedia flash file the vertex points are simply sorted by their chronological creation.

you have an idea how to sort a vertexlist so it matches the shape of the original vector data?
do i need to write my own triangulation implementation for this?

i hope here’s some clever guy that could help with this?! :wink:

thanks a lot!

eph

#2

Hi,

I also was playing with loading SWF to Xith3D scene, and made an test case which loads a Morph shape from SWF and animates it in Xith3D scene.

To figure out what is the problem in your case, would be great if you can make an example with source where I can take a look, or, alternatively, I can send you my code, so you can check how it works.

There is a known problem in my code with self-intersecting shapes, but I did not spend any time to work this out.

I am very interested in SWF importer for Xith3D, so you can treat on me in all the Xith3D aspects.

Yuri

#3

Hey Yuri,

i have uploaded my test code and some .swf sample files to:
http://files.euda.org/m/java/XithSWF.zip

there are basically 2 applications in it:
(both can be started by passing the location of the swf to be loaded via a command line argument)

* DumpSWF2D
loads a swf shape and displays its shape & vertices numbered in the order in which they are passed to the trianglearray (keys 0-9 control subdivisions)

* DumpSWF3D
loads a swf and displays it as a shape3d using xith
(keys 0-9 control subdivisions, spacebar controls appearance, arrow keys rotation, arrow keys + alt move)

it is far away from being a general swf importer, quite tailored to my specific needs.
still i’d like to have a look at your code if possible, but i believe we might have both about the same problem with concave polygons…

what solution to this problem could you imagine?

eph!