Hello! I think it would be a great idea for a more advanced decal to include tangent space for certain effects, like footprints with normals and POM. Currently, decals lack tangent space, so when rotating decals the normals are wrong, along with any parallax effects.
I have a Blueprint system in place to adjust the normals for rotation, but I haven’t gotten parallax to work successfully. If the decals can include information for tangent space, that will make everything happen automatically. I am willing to accept the fact that this will incur a heavier cost: for footprints, this will work wonders.