Ever since I tripped across the wParallax site, I have been intrigued by window box shaders and waited for Redshift to get this capability natively. At that time, only Octane could support OSL shaders but not Redshift. But about 3 years ago, OSL shader capability started to appear in Redshift. So, I ran off to GitHub and waited for something to appear. Unfortunately, it took another year or so for jiWindowBox.osl to be listed at the Redshift GitHub site.
Using the free parallax maps at wParallax, I gave it a test --- no go. So I stopped looking.
But then I tripped over the ShadersBox website. Their prices are higher than wParallax but they say that their OSL shader is supported by Redshift (as well as Octane). Is it the same as the one found at GitHub? I have no idea.
Now, I would have stopped there, but ShadersBox sells a sample pack of their rooms plus their own OSL shader. But I decided to give it a try as I was interested in seeing if their OSL shader worked (whereas the GitHub one did not) and the cost was only $5.
And hooray! It works in C4D!!!
The pack also includes 6 rooms (or sets of parallax maps in exr format) in day and night configurations and in 1K, 3K and 4K resolutions. Two rooms from each of their commerce, office, and personal living collections are in the sample pack.
Definitely worth checking out for those into modeling 3D buildings.
Dave