How do i make the front side detecting a part on it angle without DotProduct?

if you don’t understand basically i want like something like a front part, so if a part is on very close angle to the front part then it will print like said in the image, but i want to do it without dotproduct, any suggestions?

why not just create a Part in front of the other Part and use .Touched?

no but i like want it on range, so basically i want like a ranged front angle system on parts.