Forums Technical Discussion VEX get the vertex number

VEX get the vertex number

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c0y
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Joined: June 2016
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Hi,
I simply want to find the vertex number of a point inside a given primitive in VEX



For example :
I want to find the vertex number of point 45 in primitive 41 (which is 0)
I want to find the vertex number of point 45 in primitive 31 (which is 2)
I want to find the vertex number of point 55 in primitive 41 (which is 3)


I tried int pointvertex(<geometry>geometry, int point_num) function,
int primvertex(<geometry>geometry, int primnum, int vertex)
I also tried primvertices or pointvertices

But they never gives me the good number, maybe because this is linear vertex

Any help would be appreciated

Thanks !

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malbrecht
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You need vertexprimindex [www.sidefx.com] to convert from linear (“global”) vertex ID to “local” (within the given primitive).

Marc Albrecht
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https://www.marc-albrecht.de [www.marc-albrecht.de]
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c0y
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Ahh okay, i've missed this one !

so I did something, a little bit tricky, I don't know if there's a simpler way but I found what I want.

int point = 55;
int primitive = 41;

int vtxList[] = pointvertices(0, point);
i[]@vtxList = vtxList;

int primList[];
foreach(int vtx; vtxList)
{
    int prim = vertexprim(0, vtx);
    append(primList, prim);
    if(prim == primitive)
    {
        int vtxNum = vertexprimindex(0, vtx);
        setpointattrib(0, "vtxNum", point, vtxNum, "set");
    }
}
i[]@primList = primList;

Thanks !
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