Template:LSL Constants/GLTF Blend Modes

GLTF Alpha Mode	value	description
PRIM_GLTF_ALPHA_MODE_OPAQUE	0	Ignore the alpha value and render the material as opaque.
PRIM_GLTF_ALPHA_MODE_BLEND	1	Render the material with transparency determined by the alpha value. Blending is done in linear color space. As is the case for Blinn-Phong as well, this mode suffers from depth sorting and performance issues. Use alpha mask instead when possible.
PRIM_GLTF_ALPHA_MODE_MASK	2	Render the material as fully opaque where the alpha value is greater than the alpha cutoff, and otherwise render the material as fully transparent.