Note: Unlike
BaseMaterial3D whose filter mode can be adjusted on a per-material basis, the filter mode for
Decal textures is set globally with [member ProjectSettings.rendering/textures/decals/filter].
Note: Setting this texture alone will not result in a visible decal, as
texture_albedo must also be set. To create a normal-only decal, load an albedo texture into
texture_albedo and set
albedo_mix to
0.0. The albedo texture's alpha channel will be used to determine where the underlying surface's normal map should be overridden (and its intensity).