Volume Viewer - memory usage

In some situations, Volume Viewer uses more memory than is necessary.

• For the DSN6, Delphi, and XPLOR formats, the whole file is read in order to extract a subregion; thus, specifying a subregion will speed up rendering and display but will not conserve memory. In contrast, only the specified subregions are read from MRC, NetCDF, and Priism files.
• Rendering a solid display uses four float values per voxel in RGBA mode and one 2-byte integer per voxel in colormap mode. The Use colormap... setting (in Solid rendering options) controls whether a colormap is used.
• Rendering a solid display with 3D texture mapping makes an RGBA8 OpenGL texture (4 bytes per voxel). With 2D texture mapping, three such RGBA8 arrays are used. The Solids using 2D textures setting (in Solid rendering options) controls whether 2D or 3D texture mapping is used. See also Minimize texture memory use.