as i see we have those so far.
v0[3] - position
v3[3] - normal
v7[2] - tex coord1
v8[2] - tex coord2

what about getting color-vectors and vertex_weight. this one crossed my way many times when i was looking at some sources i found.

in a description i found there are the following ones:
v0[3] - position x,y,z,w
v1[3] - vertex weight w,0,0,1
v2[3] - normal x,y,z,1
v3[3] - primary color r,g,b,a
v4[3] - secondary color r,g,b,a
v5[3] - fog coefficient fc,0,0,1
v6[3] - tex coord1 s,t,r,q
v7[3] - tex coord2 s,t,r,q





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