2011

Table Of Contents

Summary

The program indexes objects in a region by recording their positions in space.

The result is called a spatial index. The spatial index is tree structured and has

branching nodes to which objects are attached. The index has two major

branches. The paper space branch is called a quad-tree and treats objects as

two-dimensional. The model space branch is called an oct-tree and treats

objects as either two- or three-dimensional. The model space branch can also

be changed to a quad-tree when you are working on two-dimensional drawings.

TREESTAT displays information about each branch. The most important

information is in the first two lines of the report—number of nodes, number

of objects, maximum depth of the branch, and average number of objects per

node.

REDRAW and object selection are very slow, you can improve their

performance. For example, if there are 50 megabytes of memory available and

the current drawing has 50,000 objects with only 1,000 nodes in the index

tree, increase the

TREEDEPTH value to improve performance.

Each node consumes about 80 bytes of memory. The fewer objects per node

of the oct-tree, the better the performance.

TRIM

Quick Reference