5.8.2 Reentrant Grids

**Figure 5.13:** Grid contouring examples showing (a) an infinite grid (b) the same grid rendered at a different center, notice that the grid is rendered in the center of the scene, not at the molecule and (c) a non infinite density grid showing the grid corners or extent of the grid.
[Reentrant] [Reentrant] [Non-reentrant]

Some grids have fixed extents and some grids are infinitely reentrant in space. Reentrant grids obviously cannot be displayed in their entirety, so instead only the region around the center of the current scene is displayed. Some non-reentrant grids are also too large to display in their entirety and therefore behave as reentrant grids. This behavior can be modified by changing the Large Grid Cutoff value in the application preferences (see chapter 12). This preference determines the size at which grids will be treated as reentrant grids vs. complete grids. The actual value itself correlates to the number of cells in the grid.

This mechanism sometimes cause what appear to be strange artifacts in grids, mainly noticed as holes appearing in Solid displayed grids. Grids that are being rendered as reentrant can be distinguished from non- reentrant grids by the absence of grid corners which define the extents of non-reentrant grids.

				VIDA User Manual

				VIDA User Manual