How to render only the shadow

Technical Support Modeling
1

How to render only the shadow from this scene?

image
image1920×1920 4.84 MB

here’s the file if anybody wants to take a look

2

In Cycles, you could just override the non-transparent materials with a white Diffuse BSDF.

(Eevee, on the other hand, has a shadow pass in the view-layers’ passes)

3

image
image332×581 18.2 KB

Only the light source’s shadow can be extracted.
If ambient occlusion is also needed, you can check it as well.
You can check the result in the Compositing Render Layers node.