I assume this decal is a blast mark or something with transparency around the edges?
Just lock clamp the texture and create a mesh using only those triangles that get affected:
If you just make sure the edges are transparent, the areas of triangle that go way beyond what you actually want will be invisible. The real deal will look like this:
Just lock clamp the texture and create a mesh using only those triangles that get affected:
If you just make sure the edges are transparent, the areas of triangle that go way beyond what you actually want will be invisible. The real deal will look like this: