User:jenna Huntsman

thumb|Jenna Huntsman

Intro

I'm a hobbyist scripter.

Projects

LSL

My Marketplace Store.

Code Snippets

sRGB EOTF

Note that when converting a colour from regular LSL space (sRGB) to linear space for use in a light, it's likely quicker and cleaner to use the internal function llsRGB2Linear. This is mostly a function that can be used for fun to manipulate the gamma space of colours.

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/LSL

Jenna_Huntsman

Summary

Function: vector srgb_eotf( vector color, float gamma );

Converts a gamma-encoded color value to linear space. Useful when dealing with lights (as these expect a non-gamma-encoded color).
Returns a vector

• vector	color
• float	gamma

Specification

vector srgb_eotf(vector color, float gamma) //To convert from regular LSL colour to light colour, gamma value should be 2.4
{ //Conversion from gamma-encoded sRGB space to linear space. Credit: Jenna Huntsman, Christopher J. Howard
    vector low = color / 12.92;
    vector high = <llPow((color.x + 0.055)/1.055,gamma), llPow((color.y + 0.055)/1.055, gamma), llPow((color.z + 0.055)/1.055, gamma)>;
    return mix(low, high, step(<0.04045,0.04045,0.04045>, color));
}

float max(float x, float y)
{ //Return the higher of 2 given values.
    if( y > x ) return y;
    return x;
}

vector mix(vector x, vector y, vector t)
{
    vector ret;
    ret.x = x.x*(1-t.x) + y.x*t.x;
    ret.y = x.y*(1-t.y) + y.y*t.y;
    ret.z = x.z*(1-t.z) + y.z*t.z;  
    return ret;
}

vector step(vector edge, vector x)
{
    vector ret = <1,1,1>;
    if(x.x < edge.x) ret.x = 0;
    if(x.y < edge.y) ret.x = 0;
    if(x.z < edge.z) ret.x = 0;
    return ret;
}

Examples

vector LampCol = <1,0.74510,0.47451>; //3200 kelvin
llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_POINT_LIGHT,1,srgb_eotf(LampCol,2.4),1,20,0,PRIM_GLOW,ALL_SIDES,1,PRIM_COLOR,ALL_SIDES,LampCol,1,PRIM_FULLBRIGHT,ALL_SIDES,1]);
//Set light source colour and prim colour to same colour; despite taking different input values.

Random Notes

I be a placeholder. At least for now.