Thank you for the links, but I guess finding specific topics on a dedicated website like Cineversity would be easier and more convenient.
A little disappointed that it does not work as I can see from forums for quite some time.
I reported it on the Maxon Support Requests page.

Last few days tried to watch some Cineversity videos and noticed that lot of series does not show videos.

Examples:

https://cineversity.maxon.net/en/series/create-with-maxon-master-playlist?tutorial=easy-motion-graphics-templates-2-4-create-with-maxon

https://cineversity.maxon.net/en/series/vfx-and-chill-rewind?tutorial=vfx-and-chill-toon-shading-in-redshift

Reported to Maxon team few days ago but web is still non functional.

C4D Remesh worked just fine, it respects vertex color data so I was able to make low-res model from 7M to 600k polygons (with a pretty good new vertex color map) to work/test renders , and I just switched ON the hi-res model layer for final rendering.
I could use Xref object to have a lower file size working scenes (hi-res model=600MB), but I had no time to test it, I will try how that works.

@Dr-Sassi said in Zbrush sculpted C4D model poly reduction and texture baking:

If you like to animate to a certain degree, perhaps the Mesh Deformer is the way to go, as that can be very rough and allows you to run even heavy models.

Yes, that's what I'm doing, using the bend deformed to bend the head, but it's very slow.
Whenever I select the mesh or it's tags, C4D halts and takes 1min to be responsive again.

Without any idea of your model (Thanks for the link, but that is just a few pictures and some data), I can't say anything about UVs; without UVs, baking textures is impossible.

Here is the UV map screengrab:
https://ibb.co/NmbhxsY

Here is the mesh topology look:

Here is a look with the vertex map:

The provided image texture map is pretty bad:

Remember that 70M (or per link 18M) polygons may provide a smooth edge (all in limits) to small PolyGroups "UV Islands". However, the new low-res mesh can't reproduce those smooth edges, naturally not. Seams will most likely have problems.

Yes, that's why I wanted to bake a displacement map, I'm sure I saw long-time ago tutorial on how to bake a displacement map from hires model do lowres model with C4D sculpting tools, but can't find it again.
I'm sure for displacement that its possible but not sure how the vertex color map would transfer.
Thank you.

Hello,
I purchased this model (C4D+ZBrush format):
https://www.cgtrader.com/3d-models/animals/reptile/chameleon-quaricornis-four-horned-chameleon
The model is ZBrush sculpted and it's heavy to work with (7Mil polygons).
Material is vertex color driven but it has a .BMP color map as well.

I would like to reduce its poly count and bake Color and Displacement texture for use with lower-res model for rendering with Redshift/C4D.

Do you have some suggestions or tutorials for the efficient poly reduction and texture baking process?
Thank you.