The observer's or camera's orientation relative to the glass surface and the incident or reflected light during inspection.
GlassRenu · Educational illustration
Meaning and boundaries
An oblique angle that reveals a feature is not necessarily the angle used for contractual acceptance.
Why it matters in glass restoration
Angle strongly affects scratch visibility, reflection, coating appearance, anisotropy, and distortion.
Related terms
References
- ASTM International — ASTM C1036-25: Standard Specification for Flat Glass
Publisher’s original source - National Glass Association — Guidelines on How to View Decorative Glazing Products
Publisher’s original source - National Glass Association — Iridescence in Heat-Treated Architectural Glass
Publisher’s original source