C4D Materials

You can find some of them on c4dcenter.com

What about textures for blender? There are a lot of good seamless PBRs on google but so hard to get ones hands on decent links for paid packs without having to deal with a million paid links

c4dcenter.com is a great resource and much better than the stuff Adobe gives you with Dimension!

for what renderer ? i personally use grayscalegorilla materials for octane and they are the best

you can use polyhaven its free and high quality

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oh and pls consider donate to them, since its the only source they can keep going with the great stuff