KDTree for Autolisp

A very fast KDTree(nanoflann) for Autolisp in ObjectARX

tree functions

• (kdtreecreate listOfPoints)
• (kdtreeradiusSearch point3d radius)
• (kdtreeknnSearch point3d num_search)
• (kdtreepoints)
• (kdtreedestroy)

search return value is ((indexs)(distances))

map functions

Wraps std::unordered_map for AutoLisp. While the key can be any of the lisp types listed, the intent to have a fast hash key for 3d points

• (mapclear)
• (mapinsert key value)
• (mapgetat key value)
• (mapcontains key)
• (mapgetall)

Allowed types for key or value (int, double, ename, point2d, point3d, string)

set functions

Wraps std::unordered_set for AutoLisp.

• (setclear)
• (setinsert key value)
• (setcontains key)
• (setgetall)

Allowed types for key or value (int, double, ename, point2d, point3d, string)

install

appload the arx in the releases

Supported platforms

• AutoCAD 2025-2026
• BricsCAD 2026
• GstarCAD 2026
• ZwCAD 2026
• if you don't see a version for your platform, create an issue