The Fresnel effect in 3D rendering affects surface reflections by changing their intensity based on the viewing angle, simulating real-world light behavior.
- **Shallow angles (glancing view):** Reflections become stronger. For example, when viewing a surface from the side, materials like water or glass reflect more surrounding light, appearing highly reflective. - **Steep angles (head-on view):** Reflections weaken. Looking directly at the surface, less light is reflected, making the material appear more transparent or matte, such as seeing through glass when facing it straight.
This angle-dependent variation enhances realism, ensuring 3D surfaces mimic how real materials reflect light, from shiny glancing reflections to subtle head-on transparency.