diff options
Diffstat (limited to 'src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp')
| -rw-r--r-- | src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp b/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp index 9a1c132..979ce68 100644 --- a/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp +++ b/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp @@ -50,14 +50,14 @@ QGraphicsSceneBspTreeIndex index use a BSP(Binary Space Partitioning) implementation to discover items quickly. This implementation is - very efficient for static scene. It has a depth that you can set. + very efficient for static scenes. It has a depth that you can set. The depth directly affects performance and memory usage; the latter growing exponentially with the depth of the tree. With an optimal tree depth, the index can instantly determine the locality of items, even for scenes with thousands or millions of items. This also greatly improves rendering performance. - By default, the value is 0, in which case Qt will guess a reasonable + By default, the depth value is 0, in which case Qt will guess a reasonable default depth based on the size, location and number of items in the scene. If these parameters change frequently, however, you may experience slowdowns as the index retunes the depth internally. You can avoid |