Una ves que encontras la posicion nen el model viewer copias los numeros y agregas la linea $origin al QC con los numeros.Ejemplo
Código:
/*
==============================================================================
QC script generated by Half-Life MDL Decompiler 1.2
2003, Kratisto. Based on code from Valve's HL SDK.
v_glock18.mdl
Original internal name:
"v_glock18.mdl"
==============================================================================
*/
$modelname "v_glock18.mdl"
$cd ".\"
$cdtexture ".\"
$scale 1.0
$cliptotextures
$bbox 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000
$cbox 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000
$eyeposition 0.000000 0.000000 0.000000
$origin -1.000000 2.500000 -1.000000
//reference mesh(es)