Max wrote: ↑
Tue Jan 19, 2021 3:01 pm
im still confused what you want to achieve but this is the workflow:
1) in the ground material properties select "Shadows" and "Matte"
2) in the ground geometry Appearance tab select "hidden from Reflections/Refractions"
3) in the render options enable output files and enable "Shadow"
4) save the render image
you will have 2 renders
1)beauty with the metal sphere reflecting the hdri backplate environment with no shadows and no plane
2) shadow pass with the shadows casted by the hdri and the contat ground shadows
open photoshop put the shadow pass on top of the beauty pass and set the shadow pass to multiply
I'd like to find out what I wondered about in the initial post - is there a way to get a proper backplate integration, reflections from what is shown on the backplate onto the objects, like it's done in Vray (see the initial link - the teapots reflect the road markings of the shadow catcher plane that has the backplate camera-projected onto it).
See the gap between the concrete alleyway slabs in the initial image, it is not reflected into the sphere, when I follow the typical MS backplate rendering process. I rotate the HDRI environment so it matches the orientation of the backplate and follow the same process as you have described.