I am modeling a Nissan Z GT500 and I got this weird shading artifacts when I added subdivision surface modifier and wanted to add reinforcing edges/vertices:
I think it would need another reinforcing edge but I'm not sure.
I included the .blend file if anyone wants to take a closer look: https://drive.google.com/file/d/1SL9-5o73_eClezarKP5Slb0IJ3wlA5s3/view?usp=sharing
Thanks in advance for your help!