LlGetAlpha

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Contents

Summary

Function: float llGetAlpha( integer face );
50 Function ID
0.0 Delay
10.0 Energy

Returns a float that is the alpha of face.

• integer face – face number or ALL_SIDES

If face is ALL_SIDES then the function returns the sum of alpha of all the faces on the prim, range [0, sides] Otherwise the return is in the range [0, 1].

Caveats

  • If face indicates a face that does not exist the return is 0.0

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Examples

//Tells the owner the alpha on all sides
default
{
    state_entry()
    {
        integer i = 0;
        integer max = llGetNumberOfSides();
        while(i < max)
        {
            llSay(0,"Face "+(string)i+" alpha is " + (string)llGetAlpha(i));
            ++i;
        }
    }
}

Useful Snippets

float AveragePrimAlpha()
{//Since this is so simple you may just want to inline it instead of including the function.
    return (llGetAlpha(ALL_SIDES) / llGetNumberOfSides());
}

See Also

Functions

•  llSetAlpha – Sets 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
•  llGetNumberOfSides – Gets the number of faces on the prim

Articles

•  Translucent Color

Deep Notes

Rounding

Alpha is stored in a 1 byte, meaning there are 256 values that are possible. Consequently the values returned by this function are all multiples of 1/255. When the alpha value is initially stored the float value is rounded to the nearest multiple, turning 0.5 into 128/255.

Issues

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