diff --git a/doc/sphinx/book/box/box_index.rst b/doc/sphinx/book/box/box_index.rst
index c269c7009b286b17e5fae6bd5c973ce5c26f1a4a..7fad8932fd69db0fe2daa496e67cbb512175c0d8 100644
--- a/doc/sphinx/book/box/box_index.rst
+++ b/doc/sphinx/book/box/box_index.rst
@@ -196,47 +196,47 @@ API is a direct binding to corresponding methods of index objects of type
**RTREE iterator types**
- +--------------------+-----------+---------------------------------------------+
- | Type | Arguments | Description |
- +====================+===========+=============================================+
- | box.index.ALL | none | All keys match. Tuples are returned in |
- | or 'ALL' | | ascending order of the primary key. |
- +--------------------+-----------+---------------------------------------------+
- | box.index.EQ | field | Keys match if the rectangle defined by the |
- | or 'EQ' | values | field values is the same as the rectangle |
- | | | defined by the key -- where "key" means |
- | | | "the key in the RTREE index" and |
- | | | "rectangle" means "rectangle as explained |
- | | | in section RTREE_. |
- +--------------------+-----------+---------------------------------------------+
- | box.index.GT | field | Keys match if all points of the rectangle |
- | or 'GT' | values | defined by the field values are within the |
- | | | rectangle defined by the key. |
- +--------------------+-----------+---------------------------------------------+
- | box.index.GE | field | Keys match if all points of the rectangle |
- | or 'GE' | values | defined by the field values are within, or |
- | | | at the side of, the rectangle defined by |
- | | | the key. |
- +--------------------+-----------+---------------------------------------------+
- | box.index.LT | field | Keys match if all points of the rectangle |
- | or 'LT' | values | defined by the key are within the rectangle |
- | | | defined by the field values. |
- +--------------------+-----------+---------------------------------------------+
- | box.index.LE | field | Keys match if all points of the rectangle |
- | or 'LE' | values | defined by the key are within, or at the |
- | | | side of, the rectangle defined by the field |
- | | | values. |
- +--------------------+-----------+---------------------------------------------+
- | box.index.OVERLAPS | field | Keys match if all points of the rectangle |
- | or 'OVERLAPS' | values | defined by the key are within, or at the |
- | | | side of, the rectangle defined by the field |
- | | | values. |
- +--------------------+-----------+---------------------------------------------+
- | box.index.NEIGHBOR | field | Keys match if all points of the rectangle |
- | or 'NEIGHBOR' | values | defined by the key are within, or at the |
- | | | side of, the rectangle defined by the field |
- | | | values. |
- +--------------------+-----------+---------------------------------------------+
+ +--------------------+-----------+-----------------------------------------------------+
+ | Type | Arguments | Description |
+ +====================+===========+=====================================================+
+ | box.index.ALL | none | All keys match. Tuples are returned in |
+ | or 'ALL' | | ascending order of the primary key. |
+ +--------------------+-----------+-----------------------------------------------------+
+ | box.index.EQ | field | Keys match if the rectangle-or-box defined by the |
+ | or 'EQ' | values | field values is the same as the rectangle-or-box |
+ | | | defined by the key -- where "key" means |
+ | | | "the key in the RTREE index" and |
+ | | | "rectangle-or-box" means "rectangle-or-box as |
+ | | | explained in section RTREE_". |
+ +--------------------+-----------+-----------------------------------------------------+
+ | box.index.GT | field | Keys match if all points of the rectangle-or-box |
+ | or 'GT' | values | defined by the field values are within the |
+ | | | rectangle-or-box defined by the key. |
+ +--------------------+-----------+-----------------------------------------------------+
+ | box.index.GE | field | Keys match if all points of the rectangle-or-box |
+ | or 'GE' | values | defined by the field values are within, or |
+ | | | at the side of, the rectangle-or-box defined by |
+ | | | the key. |
+ +--------------------+-----------+-----------------------------------------------------+
+ | box.index.LT | field | Keys match if all points of the rectangle-or-box |
+ | or 'LT' | values | defined by the key are within the rectangle-or-box |
+ | | | defined by the field values. |
+ +--------------------+-----------+-----------------------------------------------------+
+ | box.index.LE | field | Keys match if all points of the rectangle-or-box |
+ | or 'LE' | values | defined by the key are within, or at the |
+ | | | side of, the rectangle-or-box defined by the field |
+ | | | values. |
+ +--------------------+-----------+-----------------------------------------------------+
+ | box.index.OVERLAPS | field | Keys match if all points of the rectangle-or-box |
+ | or 'OVERLAPS' | values | defined by the key are within, or at the |
+ | | | side of, the rectangle-or-box defined by the field |
+ | | | values. |
+ +--------------------+-----------+-----------------------------------------------------+
+ | box.index.NEIGHBOR | field | Keys match if all points of the rectangle-or-box |
+ | or 'NEIGHBOR' | values | defined by the key are within, or at the |
+ | | | side of, the rectangle-or-box defined by the field |
+ | | | values. |
+ +--------------------+-----------+-----------------------------------------------------+
|br|
@@ -627,7 +627,14 @@ Lua functions `os.date()`_ and `string.sub()`_.
=============================================================================
The :mod:`box.index` package may be used for spatial searches if the index type
-is RTREE. There are operations for searching *rectangles*. Rectangles are
+is RTREE. There are operations for searching *rectangles* (geometric objects
+with 4 corners and 4 sides) and *boxes* (geometric objects with more than 4
+corners and more than 4 sides, sometimes called hyperrectangles).
+This manual uses term *rectangle-or-box* for the whole class
+of objects that includes both rectangles and boxes.
+Only rectangles will be illustrated.
+
+Rectangles are
described according to their X-axis (horizontal axis) and Y-axis (vertical axis)
coordinates in a grid of arbitrary size. Here is a picture of four rectangles on
a grid with 11 horizontal points and 11 vertical points:
@@ -693,6 +700,20 @@ NEIGHBOR iterator always returns all tuples, and the first returned tuple will
be {3,5,9,10} ("Rectangle#2" in the picture) because it is the closest neighbor
of {1,2,3,4} ("Rectangle#1" in the picture).
+Now let us create a space and index for cuboids, which are rectangle-or-boxes that have
+6 corners and 6 sides.
+
+ | :codebold:`box.schema.space.create('R')`
+ | :codebold:`box.space.R:create_index('primary',{parts={1,'NUM'}})`
+ | :codebold:`box.space.R:create_index('S',{type='RTREE',unique=false,dimension=3,parts={2,'ARRAY'}})`
+
+The additional field here is 'dimension=3'. The default dimension is 2, which is
+why it didn't need to be specified for the examples of rectangle. The maximum dimension
+is 20. Now for insertions and selections there will usually be 6 coordinates. For example:
+
+ | :codebold:`box.space.R:insert{1,{0,3,0,3,0,3}}`
+ | :codebold:`box.space.R.index.S:select({1,2,1,2,1,2},{iterator=box.index.GT})`
+
More examples of spatial searching are online in the file `R tree index quick
start and usage`_.
diff --git a/doc/sphinx/book/box/limitations.rst b/doc/sphinx/book/box/limitations.rst
index 7851d49ad1c081f9b3c8626ac2187e5254614cd1..755deb9e01543a8272fcdd277e23d637f8139b5c 100644
--- a/doc/sphinx/book/box/limitations.rst
+++ b/doc/sphinx/book/box/limitations.rst
@@ -4,8 +4,8 @@
Number of fields in an index
For BITSET indexes, the maximum is 1. For TREE or HASH indexes, the maximum
- is 255 (``box.schema.INDEX_PART_MAX``). For RTREE indexes, the number of
- fields must be either 2 or 4.
+ is 255 (``box.schema.INDEX_PART_MAX``). For RTREE indexes, the
+ maximum is 1 but the field is an ARRAY.
Number of indexes in a space
10 (``box.schema.INDEX_MAX``).