The Decal Tool requires Blender v3.5+
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Hi Joerg, here I can't directly reply to comments so I invite you to join the Discord channel so I can have a better look at the issues you are facing and find out what's going on.
First of all, thank you for your Material library, fantastic Work.
I tried the decal function and had some problems. If I ad the decals on your normal Materials everything is fine, if I take smart (old bronze, smart metal usw) materials I see the background color, or the frame of the decal. the damage node will not work either.
The same if I use projected wood textures (from pictures not your wood texture), and try to add the decals.
I have a MacBook Pro with the M1 chip. I have the problem on Metal and openGl.
greetings from Germany