Shadow map object is the same object which the render engine uses for mapped shadows. Render engine generates the required maps automatically as a part of the rendering process. With this object, you can do the same 'manually'. For example:
Create a camera that matches the beam of a spot light
Render an image file (preferably using Realsoft 3D's native multi channel format) that contains transparency and distance channels
Map the image to a light source using the Shadow Map shader and a pyramid mapping which matches the camera geometry
Shadow Map has the following controls:
File defines the name of the shadow map file.
Smooth defines how much smoothing is applied to the shadow map. The value defines the proportion smoothing width/image width, so quite small values (0.01 - 0.1) usually suffice.
Bindings/Transparency channel selects the image channel from which shadow transparency is read.
Bindings/Distance channel selects the image channel which defines nearest shadow distance for each map pixel.