The Shadowcatcher is a unique shading property that allows the object(s) with this particular material to be invisible in the rendering but stll accept and display any shadows cast upon them. This is typically used to integrate a 3D object into a photographic background where the object would not normally have a shadow.
To use it, you can add on or more ground planes to your scene where you want the shadow to be cast.
After selecting the ground plane(s), open the Shading panel and choose the Surface Material tab. Right click the Reflectance shader component to assign the Shadowcatcher type. Various parameters are available. When the scene is rendered, shadows will be realistically cast upon the ground plane(s).
