int [] pcfind(<geometry>geometry, string Pchannel, vector P, float radius, int maxpoints)
int [] pcfind(<geometry>geometry, string ptgroup, string Pchannel, vector P, float radius, int maxpoints)
int [] pcfind(<geometry>geometry, string Pchannel, vector P, float radius, int maxpoints, float &distances[])
int [] pcfind(<geometry>geometry, string ptgroup, string Pchannel, vector P, float radius, int maxpoints, float &distances[])
<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.
These functions open a geometry file and return a list of points with the location ‹P› within ‹radius›, based on point positions found in ‹Pchannel›. Only the ‹maxpoints› closest points within the given radius will be returned. The file name may use the op: syntax to reference SOP geometry in the OP contexts. The ‹Pchannel› parameter indicates the attribute which contains the positions to be searched.
The ptgroup is a point group that limits the points to search. This is a SOP-style group pattern, so can be something like 0-10 or @Cd.x>0.5. A blank string is treated as matching all points.
The function also optionally takes a float array distances, which it modifies with the distances to each point.
The closest point is in entry 0 of the returned array, and the other points are sorted by increasing distance.
Examples ¶
Performing a proximity query:
int closept[] = pcfind(filename, "P", P, maxdistance, maxpoints); P = 0; foreach (int ptnum; closept) { vector closepos = point(filename, "P", ptnum); P += closepos; } P /= len(closept);
| See also | |
| proximity | |
| ptcloud |
|