Blocky Reflections on Glass I am working with a car model and getting all of the materials ready for use in my project. The side windows have a noticeable reflection issue where the reflection appears blocky. The headlight cover also has some strange artifacts. I have provided the blend file so you may be able to help me solve this issue. 

Blender file download (google drive): http://bit.ly/2SFRp8n
Some of your faces don't have smooth shading.
They are shaded flat, creating those ugly triangular artifacts.  

Just right click you model and select smooth shading.