llSetAlpha

Template:Needs Translation/LSL/es Template:Needs Translation/LSL/el Template:Needs Translation/LSL/he Template:Needs Translation/LSL/it Template:Needs Translation/LSL/ko Template:Needs Translation/LSL/nl Template:Needs Translation/LSL/hu Template:Needs Translation/LSL/no Template:Needs Translation/LSL/da Template:Needs Translation/LSL/sv Template:Needs Translation/LSL/tr Template:Needs Translation/LSL/pl Template:Needs Translation/LSL/pt Template:Needs Translation/LSL/th Template:Needs Translation/LSL/uk Template:Needs Translation/LSL/zh-Hans Template:Needs Translation/LSL/zh-Hant

/LSL

SetAlpha

llSetAlpha

Summary

Function: llSetAlpha( float alpha, integer face );

0.0	Forced Delay
10.0	Energy

Sets the Blinn-Phong alpha on face

• float	alpha	–	from 0.0 (clear) to 1.0 (solid) (0.0 <= alpha <= 1.0)
• integer	face	–	face number or ALL_SIDES

If face is ALL_SIDES then the function works on all sides.

Caveats

• The function silently fails if its face value indicates a face that does not exist.
• llSetAlpha will have no visible effect on faces with a PBR material. To work on faces both with and without a PBR material, use one of these snippets:
  • invisible

    llSetAlpha(0.0, ALL_SIDES);
    llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_GLTF_BASE_COLOR, ALL_SIDES, "", "", "", "", "", 0.0, PRIM_GLTF_ALPHA_MODE_MASK, 1.0, ""]);
    

  • visible

    llSetAlpha(1.0, ALL_SIDES);
    llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_GLTF_BASE_COLOR, ALL_SIDES, "", "", "", "", "", "", "", "", ""]);
    

Examples

float cloakSpeed = 0.1;

default
{
    touch_end(integer total_number)
    {
        float alpha = 1.0;
        while(alpha > 0.0)
        {
            alpha -= 0.1;
            llSetAlpha(alpha, ALL_SIDES);
            llSleep(cloakSpeed);
        }
        state cloaked;
    }
}

state cloaked
{
    touch_end(integer total_number)
    {
        float alpha;
        while (alpha < 1.0)
        {
            alpha += 0.1;
            llSetAlpha(alpha, ALL_SIDES);
            llSleep(cloakSpeed);
        }
        state default;
    }
}

Notes

In practical terms, "alpha" means "transparency" or "visibility".

To be clear, llSetAlpha will only affect the prim that the script it is in. It will not affect any linked prims. To set the alpha state for those, use llSetLinkAlpha

See Also

Events

•

changed

–

CHANGED_COLOR

Functions

•	llGetAlpha	–	Gets the prim's alpha
•	llGetColor	–	Gets the prim's color
•	llSetColor	–	Sets the prim's color
•	llSetLinkColor	–	Sets link's color
•	llSetLinkAlpha	–	Sets link's alpha
•	PRIM_COLOR	–	The equivilant parameter for llSetPrimitiveParams
•	PRIM_GLTF_BASE_COLOR	–	The equivilant PBR parameter for llSetPrimitiveParams

Articles

•

Translucent Color

Deep Notes

Signature
function void llSetAlpha( float alpha, integer face );