PRIM POINT LIGHT

Wiki description

PRIM_POINT_LIGHT is used to configure the point light configuration of the prim

Caveats

Viewers that do not have advanced lighting enabled can only render 6 lights at a time and projectors will be rendered as omnidirectional light sources. (OpenGL limitations allow for 8 light sources, SL appears to reserve one each for the Sun and Moon.)
- Viewers that do have advanced lighting enabled can render as many lights as their graphics card allows; it is not hard-limited by the viewer.
Lights with a high intensity have a wash-out effect when overlapping. Keep this in mind when using multiple lights. Never create an abundance of lights to get around the 6 light maximum in basic lighting, as viewers with advanced lighting will be washed out and may suffer from client lag.
Unlike most color in LSL, which expects a gamma-encoded value (sRGB), this expects a non-gamma-encoded value (linear RGB). This means that the value you set as the light color is not the same value you'd pass to make the source (e.g. filament ) glow the same color. You may wish to implement an sRGB Electro-Optical Transfer Function (EOTF) to bypass this.
The falloff parameter is a bit of a misnomer. Instead of modifying the characteristics of light decay over distance, it instead acts as a modifier to a light's overall intensity value.

Examples

Set the prim's color and the color of the light it emits to the same color:-

integer switch;

vector gLampCol = <255,190,121>; //Light colour in regular (0-255) sRGB space. This will be converted to LSL later.

default
{
    state_entry()
    {
        gLampCol /= 255; //Convert to LSL colour.
    }

    touch_start(integer total_number)
    {
        switch = !switch; //toggle the switch
        llSetLinkPrimitiveParamsFast(LINK_THIS,[
            PRIM_POINT_LIGHT,switch,llsRGB2Linear(gLampCol),1,20,0, //Convert colour to linear RGB as PRIM_POINT_LIGHT requires, using llsRGB2Linear
            PRIM_COLOR,ALL_SIDES,gLampCol,1,
            PRIM_GLOW,ALL_SIDES,switch,
            PRIM_FULLBRIGHT,ALL_SIDES,switch]);
    }
}

Basic light script:-

integer isLightTurnedOn;

default
{
    touch_start(integer total_number)
    {
//      toggle isLightTurnedOn between TRUE and FALSE
        isLightTurnedOn = !isLightTurnedOn;

        if (isLightTurnedOn)
        {
            llSetPrimitiveParams([
                PRIM_FULLBRIGHT, ALL_SIDES, FALSE,
                PRIM_POINT_LIGHT, FALSE, ZERO_VECTOR, 1.0, 10.0, 0.6]);
        }
        else
        {
            vector COLOR_ORANGE  = <1.000, 0.522, 0.106>;

            llSetPrimitiveParams([
                PRIM_FULLBRIGHT, ALL_SIDES, TRUE,
                PRIM_POINT_LIGHT, TRUE, COLOR_ORANGE, 1.0, 10.0, 0.6]);
        }
    }
}

A compact version of the above:-

integer switch;
default
{
    touch_start(integer total_number)
    {
        llSetPrimitiveParams(
        [       PRIM_FULLBRIGHT, ALL_SIDES, switch = !switch,
                PRIM_POINT_LIGHT, switch, <1, 0.5, 0.1> *  switch, 1, 10, 0.6 ] );      
    }
}

Shared wiki helpers

The original page also injects shared parameter notes, caveats or issue information through these helpers. Their conditional MediaWiki logic is not reproduced here; inspect the preserved helper source for additional material.

Template:LSL PrimitiveParam Categorize

Original shared helper source (conditional wiki logic is not evaluated)

{{#if:{{#pos:{{#var:moded}}|r}}{{#pos:{{#var:moded}}|u}}||{{#vardefine:hidden-text|{{#var:hidden-text}}
{{#ifexist:Template:LSLC{{#var:lang}}|
 {{LSLC{{#var:lang}}|PrimitiveParams}}
 {{LSLC{{#var:lang}}|PrimitiveParams/{{{1}}}}}
 {{LSLC{{#var:lang}}|{{{1}}}}}
|
 {{LSLC|PrimitiveParams{{#var:lang}}}}
 {{LSLC|PrimitiveParams/{{{1}}}{{#var:lang}}}}
 {{LSLC|{{{1}}}{{#var:lang}}}}
}}
}}}}

PRIM POINT LIGHT

Wiki description

Caveats

Examples

See also: functions

Shared wiki helpers