Decals with "stretchable", non scaling material?

[BananableOffense]

How to stop Textures from looking bad from afar?

This is exclusively due to MipMapping and texture filtering. The farther from the camera, the blurrier the texture becomes. This is important to prevent aliasing, moiré and shimmering. You actually have explicit control over this. Here is an example of a grid texture using default computed mips, vs a texture using explicitly derived mips. I’m using DDX & DDY multiplied by some value that satisfies a compromise between blurriness vs shimmering. This is a setting within the texture sample called …

Here’s an example I shared for another case that called for explicit mip calculation.
Just use these nodes except you won’t need the multiply.