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vector v0 = normalize(set(-1,0,-1));  
vector vref = set(0,0,-1);  
  
vector4 orient = dihedral(v0, vref);  
vector angle = qconvert(orient);  
  
//angle = degrees(angle)*-1;  
//v@angle = angle;


vector angle = quaterniontoeuler(orient, 0);  
angle = degrees(angle);