This is a paid asset, but now you can download Decal Master: HDRP Decal Placement Tool for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Decal Master HDRP Decal Placement Tool v1.3
Decal Placement Tool provides you with an easy-to-use workflow for putting decals on all types of surfaces in your game world.
Features:
– Does not require colliders for decals placing (GPU Raycast)
– Easy to use
– Place decals on any surface by mouse click
– Burst placing
– Painting by mininimum distance placing
– Decal templates presets
Requirements:
– HDRP
– Compute shaders support
– Compute buffers support
– Command buffers support
Tested on DX11, Windows 10, Unity 2019.3.0f5, HDRP 7.1.8