Rendered images use the texture image that is associated to a Surface Material.
The texture image is not something you can just change the colour of.
You must have various texture images for each colour and/or profile roof sheeting.
You can either find these on the internet, create your own in a photo editing program, or have a look in the surface texture catalogue that come with Archicad.
So you need to create a new Surface Material for each colour/profile roof material that you want.
Each Surface Material will have a different texture image.
You then change the Surface Material (or Building Material) of your elements (roof) to change the colour.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11