Also the edge will become softer, requiring larger Shadow Resolution values if hard edges are desired. Resolution should be used to control the general level of blur, not Edge Quality . This value provides control over the quality of volumetric fog shadows if present in the image. The higher the value, the more samples of the shadow map are taken, but the rendering speed decreases. If set to ON , the renderer creates a depth map file for the spot light the first time it is rendered.
Subsequent renders reuse the depth map and avoids the calculation time of the shadow depth map.
The depth file created by this option has the same name as the spot light. The Min Depth value is used to correct self shadowing problems in raycast shadows. The Min Depth is the world space distance that a point is moved towards a spotlight before shadowing is calculated. A relatively small Min Depth value can bring the surface out of its own shadow, especially when combined with the Blend Offset value. The most typical example of this is a groundplane.