can't name/describe this bug

[resort-sand]

I have a scene with two glasses: Tarik_glasses.1 an original mesh with a glass material, the 2nd is Tarik_glasses_animated which comes from an alembic file exported from Blender, both objects have the same number of points / polygons, and same tags, when I place a material (transparent in this bug) the render look strange on Tarik_glasses_animated as if there is refraction
I tried many ways to figure it out but no luck, any idea ?? I am not sure if it is a render or a geometry prb

-update- when I render in standard render the problem is gone or at least it looks right, comparing to RedShift[bug.c4d.zip]--error--

https://we.tl/t-Dsgu9IoyMb

[Dr. Sassi]

Hi resort-sand,

Thanks for the file.

Besides that one "glass" being flipped (Normals), the geometry seems rough, but fine. Vertex Normals were also fine; I even delete Normal Tags if everything looks good.

The problem is simply based on where the Points relate to. The glasses with the problem have their Axis to the World zero point, well, very close to it. (0.0031; 0.0; -0.0002) while also a heavy scale to 0.04
The distance of the Axis to the "animated" was around 38313.4609 cm, -286.8031 cm; 1774.9519 cm, while the object was also rotated.

Two extremely different setups. Easy to fix: Select some points and use the Tools> Axis> Axis Center to get the object axis close to the object. All points, as mentioned, relate to this Axis. It is their "private world," AKA object axis.

Not a redshift problem, but a problem with the object setup.

Here is your file back. Reduced to the problem.
https://projectfiles.maxon.net/Cineversity_Forum_Support/2025_PROJECTS_DRS/20250821_CV4_2025_drs_25_MOgl_01.c4d.zip

All the best