This function specifies the position using intrinsic primitive UVs. To use UVs stored in UV attribute, use uvsample instead.
int prim_attribute(<geometry>geometry, <type>&value, string attribute_name, int prim_number, float u, float v)
int prim_attribute(<geometry>geometry, <type>&value[], string attribute_name, int prim_number, float u, float v)
Samples the attribute value at the given UV coordinates on the primitive.
int prim_attribute(<geometry>geometry, <type>&value, string attribute_name, int prim_number, vector uvw)
int prim_attribute(<geometry>geometry, <type>&value[], string attribute_name, int prim_number, vector uvw)
Specify the UVW coordinates using a vector instead of two floats.
If you don’t need to test for errors, you can use primuv instead. This function does not work with certain primitive types such as tetrahedra and polysoups.
<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.
value
The function overwrites this variable with the interpolated value from the primitive.
attribute_name
The name of the attribute to read. For point and vertex attributes, the value will at the given UV coordinates will be interpolated from the surrounding points/vertices.
prim_number
The primitive number to read the attribute from.
u, v
The primitive UV coordinates at which to read the attribute.
Returns
Returns 1 on success or 0 on an error (for example, the attribute doesn’t exist).
Returns 0 if the type of value is larger than the primitive type. For example, you can’t read a vector attribute into a matrix variable.
| See also | |
| attrib |
|
| prim |
|