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  • $\begingroup$ If it's just a standstill image, you can probably get away with making 2 different shadow catcher "captures" (I don't want to confuse the word "pass", although I would normally use it), save them as image textures (with alpha) and then add (multiply) them together in the compositor using a mix node. $\endgroup$ Commented Apr 26, 2022 at 17:29
  • $\begingroup$ @ChristopherBennett: To catch the building shadow on the plant I would need to turn a copy of the plant into a shadow catcher, right? $\endgroup$ Commented Apr 26, 2022 at 20:19
  • $\begingroup$ Yes. That should work. One scene with building silhouette blocking light and plant as shadow catcher, and another scene with plant blocking light and ground as shadow catcher. $\endgroup$ Commented Apr 26, 2022 at 20:24
  • $\begingroup$ @ChristopherBennett: Thanks. I did that using view layers as suggested by Adisage in their answer (except I still need to extract an adjustable building shadow using the plant as a catcher). The result is this one. As I mentioned to Adisage, light is not blocked by the buildings silhouette creating a wrong shadow on the street (should not exist in the building shadow). I believe limiting the catcher to the area in the sun only is not possible (buildings shadow terminator is blurry). Any idea? $\endgroup$ Commented Apr 26, 2022 at 20:38
  • $\begingroup$ I'm not really sure how to advise further without knowing more about your project/setup - consider uploading your .blend file (or a "simplified" version that highlights the problem) here - blend-exchange.com - so users here can get a better "feel" for what you're working with. $\endgroup$ Commented Apr 26, 2022 at 20:47