prim_normal

vector  prim_normal(<geometry>geometry, int prim_number, vector uvw)

vector  prim_normal(<geometry>geometry, int prim_number, float u, float v)

vector  prim_normal(<geometry>geometry, int prim_number, float u, float v, float w)

<geometry>

When running in the context of a node (such as a wrangle SOP), this argument can be an integer representing the input number (starting at 0) to read the geometry from.

Alternatively, the argument can be a string specifying a geometry file (for example, a .bgeo) to read from. When running inside Houdini, this can be an op:/path/to/sop reference.

uvw, u, v, w

When w is not given, it is treated as zero.

Returns

The normal of the primitive (prim_number) at parametric location u, v, w.