PRIM ALPHA MODE

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/LSL

PRIM_ALPHA_MODE

Description

Constant: integer PRIM_ALPHA_MODE = 38;

The integer constant PRIM_ALPHA_MODE has the value 38

Used to specify how the alpha channel of the diffuse texture should affect rendering of a prim’s face.

llSetPrimitiveParams

[ PRIM_ALPHA_MODE, integer face, integer alpha_mode, integer mask_cutoff ]

• integer	face	–	a face number or ALL_SIDES
• integer	alpha_mode	–	PRIM_ALPHA_MODE_* flag
• integer	mask_cutoff	–	when the alpha rendering mode is PRIM_ALPHA_MODE_MASK, sets the alpha value above which a pixel renders as fully opaque, in the range 0 to 255

When used with llSetPrimitiveParams & llSetLinkPrimitiveParams

llGetPrimitiveParams

llGetPrimitiveParams([ PRIM_ALPHA_MODE ]);integer face

Returns the list [ integer alpha_mode, integer mask_cutoff ]

• integer	face	–	a face number or ALL_SIDES
• integer	alpha_mode	–	PRIM_ALPHA_MODE_* flag
• integer	mask_cutoff	–	when the alpha rendering mode is PRIM_ALPHA_MODE_MASK, sets the alpha value above which a pixel renders as fully opaque, in the range 0 to 255

alpha_mode Flags	V	Description			Notes
PRIM_ALPHA_MODE_NONE	0	Render the diffuse texture as though the alpha channel were nonexistent			The viewer’s build tool sets this by default when a face has a material and no alpha channel is present in the diffuse texture.
PRIM_ALPHA_MODE_BLEND	1	Render the diffuse texture with alpha-blending.			This value is also used as the default to clear the materials settings from a prim face.
PRIM_ALPHA_MODE_MASK	2	Render the prim face in alpha-masked mode.			Diffuse texture pixels which are more opaque than mask_cutoff will be rendered as fully opaque, while the other pixels will be fully transparent.
PRIM_ALPHA_MODE_EMISSIVE	3	Render the prim face in emissivity mode.			Diffuse texture pixels opacity maps to their emissivity when rendered. Fully opaque pixels will effectively be rendered as ‘full bright’.

Caveats

Related Articles

Functions

•	llGetPrimitiveParams
•	llGetLinkPrimitiveParams
•	llSetPrimitiveParams
•	llSetLinkPrimitiveParams
•	llSetLinkPrimitiveParamsFast

Notes

• Note that as with PRIM_NORMAL and PRIM_SPECULAR, setting a custom (i.e. not PRIM_ALPHA_MODE_BLEND) alpha mode on a prim faces causes the linkset to use the new accounting system.

• mask_cutoff is not used or stored unless the mode is set to PRIM_ALPHA_MODE_MASK.
• To delete the material from face, set the alpha_mode to PRIM_ALPHA_MODE_BLEND, in addition to clearing PRIM_NORMAL and PRIM_SPECULAR

Deep Notes

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Signature
integer PRIM_ALPHA_MODE = 38;