Defines display settings for 3D objects in the generated 2D drawing. You can open
this dialog from the View Style Properties Dialog by selecting Vector + Raster from Render Mode, and then clicking Raster Settings 
. Raster Settings is unavailable when Render Mode is set to Vector Only.
Resolution (dpi)
Specifies the quality of the rendered raster image being created. Type a higher value to increase the quality. The default value is 72 dots per inch (dpi). If this is a point cloud raster drawing, this resolution setting should not be confused with the point density of the cloud.
Background
Specifies the background color of the rendered image. The available options are defined in the Smart 3D Common task. See Style Command in the Smart 3D Common Help.