Edge information from an imported .obj file.

OpenGL Development JOGL Development
#1

Hi,

Currently, I have just loaded a .obj file, for example: teapot.obj.
I displayed the object in wireframe form so that i can see the edges.

The problem here is, I am trying to get infomation on an edge.For example to get the length of a selected edge.

In the .obj file, it only contains vertices and faces information. So how am I able to choose an edge and get its information.
I heard of winged edge and half edage representation but I do not understand them.

I tried goggle but not able to get much information.Can I get anyhelp on how am I able to do so? or how to implement the data structures in jogl?

Thanks for the help in advance.

#2

Half edge and winded edges are basically structures for representing edges and polygons in general. They are used to study connectivity and neighborhood of a vertex, polygon, and edges. If this is not what you need you may just create a simple un oriented edge datastructure which contains a reference to the 2 vert. that shares it and use this to select an edge, highlight it.

#3

yup… i do need to know the edge’s neighbour information as after i got all the informations, i need to apply some algorithm on it…is there any sample online that shows how half edge is implemented in jogl?