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.stl to triangular data structure, .ply or .obj - .stl issue...

Started by luckyyyyyy Feb 27, 2012 at 4:15 PM 2 replies 2.6k views

Original Post

Feb 27, 2012 at 4:15 PM

Actually, I want to convert *.stl file format into *.ply or *.obj.
The reason is that, stl file doesn't contain the triangles information. its just contains vertices. (normals is not an issue here..). But I want the triangular information like *.ply or *.obj has.

triangular means..*ply or *obj file format

vertex 0 0 0
vertex 0 1 0
vertex 1 1 0
vertex 1 0 0
face 1 2 3
face 1 2 4

above code has two triangles and 4 vertices. right? but *stl file doesn't contain any kind of face information.

I don't have any issue to read *stl or write *stl ... I can even render the 3D stl model.

My issue is I just want to convert this *.stl file format into *.ply or *obj.
I spent too much time on net but didn't find any kind of code or idea relevant to this. Kindly give me some idea that how can I convert it. How can i extract face information from stl ?

thanks.

jesse007

Feb 27, 2012 at 7:39 PM

I don't have any issue to read *stl or write *stl ... I can even render the 3D stl model.

[...]

How can i extract face information from stl ?

So you can read, write, and render an stl model, but can't extract the faces. That makes no sense. I don't know exactly what you want, but MeshlLab seems to do .stl conversions:

http://meshlab.sourceforge.net/

and Wikipedia describes .stl:

http://en.wikipedia....8file_format%29

luckyyyyyy

Feb 28, 2012 at 8:14 AM

Its really simple... I want to load the *.stl vertices and faces into my *.obj or *.ply data structures.

Following is the data structure that can be used with *.obj or *.ply. But we can not use this data structure for *.stl. For *.stl we do not know the indices information. I want to extract that information. for example triangle (indic1, indic2, indic3). So this the issue to use the same data structure for *.stl.

struct GLpoint
{
float x, y, z;
};
GLpoint *Vertices;

struct GLface
{
unsigned int v1, v2, v3;
};
GLface *indinces;

Thanks.

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