[Closed] sdk – vertex indexes and faces

working on a exporter.
it takes the following format:

vertex pos x y z

and then it has one line for each face,
that specifies the vertex index for that face.

I’m exporting the positions without problems, but I have trouble understanding the indexing, I tried all day yesterday, but I’m missing something.

Also I wonder how one does optimize i afterwards (shared vertices)…

anyways, my current code is this:

Getting vertex positions (this works fine):

	for(int f = 0; f < numFaces; ++f)
		{
			Face* face = &mesh->faces[f];
			float Vertpositions[3];

			

			for(int v = 0; v < 3; ++v)
			{
				DWORD vi = face->v[v];
				Point3 vPos = mesh->verts[vi];
				Point3 vLocalPos = offsetTM.PointTransform(vPos);
				//write out each vertex position insert to array
				Vertpositions[0] = vLocalPos.x;
				Vertpositions[1] = vLocalPos.y;
				Vertpositions[2] = vLocalPos.z;
			}
			//write out positions
			fprintf(file,"<p x=\"%f\" y=\"%f\" z=\"%f\"/>
",Vertpositions[0],Vertpositions[1],Vertpositions[2]);
		}

The trouble starts when I need to go through each face, get the indexed vertexes for this face. I cannot get it to work like it should.

fprintf(file,"<set_material sval=\"defaultMat\"/>
");
DWORD vertIndex[3];
for (int f = 0; f < mesh->getNumFaces(); ++f)
{
	Face* face = &mesh->faces[f];
	for(int v = 0; v < 3; ++v)
	{
		vertIndex[v] = face->GetVertIndex(f *3 +v);
	}
	fprintf(file,"<f a=\"%i\" b=\"%i\" c=\"%i\"/>
",vertIndex[0],vertIndex[1],vertIndex[2]);
}

Any hints, tips and so on is greatly appreciated – I hate to be stuck at things like this.

The output i get with a simple cube is this:

<mesh vertices="8" faces="12" has_orco="false" has_uv="false" type="0">
<p x="0.500000" y="0.500000" z="0.000000"/>
<p x="-0.500000" y="-0.500000" z="-0.000000"/>
<p x="0.500000" y="0.500000" z="1.000000"/>
<p x="-0.500000" y="-0.500000" z="1.000000"/>
<p x="0.500000" y="-0.500000" z="1.000000"/>
<p x="-0.500000" y="-0.500000" z="-0.000000"/>
<p x="0.500000" y="0.500000" z="1.000000"/>
<p x="0.500000" y="-0.500000" z="-0.000000"/>
<p x="-0.500000" y="0.500000" z="1.000000"/>
<p x="0.500000" y="0.500000" z="0.000000"/>
<p x="-0.500000" y="-0.500000" z="1.000000"/>
<p x="-0.500000" y="0.500000" z="0.000000"/>
<set_material sval="defaultMat"/>
<f a="0" b="3" c="1"/>
<f a="0" b="3" c="3"/>
<f a="3" b="2" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
<f a="3" b="3" c="3"/>
</mesh>

You can clearly see that the indexing is wrong, no matter what way I tried I never get it right.

a working example is something like this (the output i expect is similar to this):

<mesh vertices="8" faces="6" has_orco="true" has_uv="false" type="0">
			<p x="1" y="1" z="0.0166583" ox="1" oy="1" oz="-1"/>
			<p x="1" y="-1" z="0.0166583" ox="1" oy="-0.999999" oz="-1"/>
			<p x="-1" y="-1" z="0.0166583" ox="-1" oy="-0.999999" oz="-1"/>
			<p x="-1" y="1" z="0.0166583" ox="-0.999999" oy="1" oz="-1"/>
			<p x="1" y="0.999999" z="2.01666" ox="1" oy="0.999999" oz="1"/>
			<p x="0.999999" y="-1" z="2.01666" ox="0.999999" oy="-1" oz="1"/>
			<p x="-1" y="-1" z="2.01666" ox="-1" oy="-0.999999" oz="1"/>
			<p x="-1" y="1" z="2.01666" ox="-1" oy="1" oz="1"/>
			<set_material sval="Material--9223372036841686116"/>
			<f a="0" b="1" c="2"/>
			<f a="2" b="3" c="0"/>
			<f a="4" b="7" c="6"/>
			<f a="6" b="5" c="4"/>
			<f a="0" b="4" c="5"/>
			<f a="5" b="1" c="0"/>
			<f a="1" b="5" c="6"/>
			<f a="6" b="2" c="1"/>
			<f a="2" b="6" c="7"/>
			<f a="7" b="3" c="2"/>
			<f a="4" b="0" c="3"/>
			<f a="3" b="7" c="4"/>
</mesh>