|Options menu > Environment...|
Environment displays the Environment Dialog, which is used for setting up atmospheric and background effects.
Shadow Map Size
This parameter control the image size of shadow map for Projected Shadow & Shadow Mapping. For Shadow Mapping, there is a console variable r_shadowmapsize , and finally adopted image size = Shadow Map Size X r_shadowmapsize . ( e.g. , set Shadow Map Size to 256, and r_shadowmapsize is 4 , then finally adopted size is 256 X 4 = 1024 )
Bigger Shadow Map Size gets more clear shadow, but worse performance.
Use 32-Bits Float Shadow Map
The default shadow map format is 16-bits float, use 32-bits float format gets better graphic quality but debase performance.