The ratio of multi-pass textures compared to the color map

Question

I have 4 textures used in a multi-pass effect, with the highest quality color map - for this example, 512x512. Currently, Normal, Specular, and Parallax cards are the same size. Additional cards occupy a significant part of VRAM. It seems incredibly wasteful.

My intention is to reduce the size of multipass cards.

Color - 512x512 Normal - 256x256 (50% of the original to contain enough details) Specular - 256x256 (50% of the original, again to maintain details) Parallax - 128x128 (25% of the original, like blurry parallax, can be useful - or so they say to me )

My question is: can I reduce the ratio of normal, mirror and parallax maps further? Are these relationships reasonable? What odds should I use?

Thank you, Chris

Answer 1

tbh, I would like to maintain the normal size of the map and bring down the color map. All the details in the final image come from a regular map, in fact there are very few figures from a color map.

In addition, its texture compression is complete.