VIdentityO
R3VECTOR *VIdentityO();
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Address of IdentityO vector
RETURN VALUE address of vector which value is [0,0,0]. NOTE: this vector is read only.
VidentityX, VidentityY, VidentityZ
/* generate points for circle */ R3VECTOR points[10]; R3VEllipse(points, 10, VIdentityO(), VIDentityX(), VIdentityY());