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.

Photo Checklist Page Update

This is some text. I need to do something here.

Lens Settings

The table below contains settings for simulating various real-life lenses within Second Life. These settings will change the camera's Field of View (FoV), as well as Depth of field (DoF) settings. You may want to play around with some of these settings (for example, the Aperture value) to manipulate the depth-of-field effect.

Tip: The default Second Life camera is roughly equivalent to a full frame digital (36x24mm sensor) camera using 31mm lens.

For reference, the following table describes the debug settings changed, their units, and what the setting does. Default values are not provided as these settings may vary between viewers.

Debug Setting Glossary

Debug Setting	Units	Description
CameraAngle	Radians	Camera Field-of-View angle, horizontal. Equivalent to Angle of View - width degrees to equate a real lens. This changes the visible FoV.
CameraDoFResScale	Linear	Amount to scale down resolution of DoF effect. Manipulating this value may change performance.
CameraFieldOfView	Degrees	Field-of-View angle used for the DoF effect. Note that this value is the height FoV, NOT width.
CameraFNumber	F Stop	F Stop (or Aperture) value to be simulated by DoF effect. This is the value you should change to adjust the intensity of the DoF effect.
CameraFocalLength	mm	Focal length of the lens to be simulated by the DoF effect.
CameraMaxCoF	mm*1000	Lens Circle of Confusion value to be simulated by the DoF effect.
CameraFocusTransitionTime	Seconds	Time the camera will take to transition between 2 focal planes.

Editor note: The below settings assume that the screen is in the 16:9 aspect ratio - These values vary depending on aspect ratio, so if you have a screen of a different ratio, you may need to recalculate these values.

Note: To manipulate the intensity of the Depth-of-Field effect, change the aperture (F number) value. Common values are: 1.4, 2, 2.8, 4, 8, 12, 16, 20, 24

8 mm (Fisheye)
Debug Setting	Value
CameraAngle	2.306
CameraFieldOfView	103.4
CameraFocalLength	8
CameraMaxCoF	29.0

16 mm
Debug Setting	Value
CameraAngle	1.688
CameraFieldOfView	64.65
CameraFocalLength	16
CameraMaxCoF	29.0

24 mm
Debug Setting	Value
CameraAngle	1.287
CameraFieldOfView	45.75
CameraFocalLength	24
CameraMaxCoF	29.0

31 mm (SL Default)
Debug Setting	Value
CameraAngle	1.047
CameraFieldOfView	35.98
CameraFocalLength	31
CameraMaxCoF	29.0

50 mm
Debug Setting	Value
CameraAngle	0.691
CameraFieldOfView	22.9
CameraFocalLength	50
CameraMaxCoF	29.0

75 mm
Debug Setting	Value
CameraAngle	0.471
CameraFieldOfView	15.38
CameraFocalLength	75
CameraMaxCoF	29.0

100 mm
Debug Setting	Value
CameraAngle	0.350
CameraFieldOfView	11.56
CameraFocalLength	100
CameraMaxCoF	29.0

Did you know that you can leave DoF enabled for daily use? Try the settings given above for 31 mm, with an F-Stop (F number) value of 16.0.

How to calculate lens settings

If you don't have a 16:9 aspect ratio monitor, you will want to recalculate the lens settings.

To recalculate the lens settings:

1. Visit this website: [1]
2. Enter the desired focal length of the lens.
   • The desired focal length is also one of the settings we need. (Debug setting: CameraFocalLength)
3. Scroll down, and select Option 1.
   • Advanced users: You may also want to change the sensor size if you are trying to match footage shot with a specific camera (e.g. a phone camera). See the following website to get some additional values: Sensor chart
4. Under Option 1, select the desired Aspect Ratio crop.
5. Click Recalculate.
6. Visit this website in a new tab or window: [2]
7. Enter the value from the first website called "Angle of View - Diagonal Degrees" in the "deg" field of the second website.
   • The value given in the "rad" field is the new value for your FoV (Debug setting: CameraAngle).
8. Back on the first website, find the value for "Angle of View - Height Degrees".
   • The value in this field is the new value for the DoF FoV (Debug setting: CameraFieldOfView)