Glass

thumb|Refraction demonstration
Glass is a material added to Roblox on December 6, 2017. 
Glass is the second material to have special effects, with the first being Neon. When fully opaque, glass looks similar to metal, in that it appears smooth but reflects light much more than plastic. When the opacity is decreased, parts with glass applied start to have unique visual effects such as refracting light. Glass parts use the Fresnel Reflection effect, meaning that surfaces that become more perpendicular to the plane of the camera become more opaque. 
To save processing power, particles, terrain water, and objects of any transparency are not rendered behind translucent parts that have the glass material applied. This limitation has been used as a gameplay mechanic in some games, requiring the player to use a glass part to "filter out" barely transparent parts, usually indicating that they cannot be collided with. Originally, to save processing power, decals did not render behind translucent glass; this has since been changed.
Translucent glass also tints objects behind it with the multiply blend mode, instead of the usual "normal" blend mode of other materials.
==Gallery==
SmallGlassTexture.png|The smaller texture when the player disables Use2022Materials in Roblox Studio.
== References==
Category:Materials