Alpha

A float representing transparency, which can apply to textures and text (via llSetText). The alpha value is interpreted as an opacity percentage: 1 is fully opaque and .2 is mostly transparent. The functions that allow you to set alpha are not clamped like the edit mode setting is; you may set an object to 100% transparent (0.0 alpha) with any of the llSet* functions listed below.

Functions

llGetAlpha
llSetAlpha
llSetLinkAlpha
llSetPrimitiveParams

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Texture | Alpha Channel | Opacity/Transparency