How can I reverse this function?

[Life Camino]

I found this function that takes the start parameter from the on_rez event and converts it into a color vector, and I would like to know how I might do the reverse by converting a color vector into an integer that would work with this function?

 

vector RGBAtoColor(integer rgba)
{
    return < ((rgba >> 16) & 0xFF) / 255.0, ((rgba >> 8) & 0xFF) / 255.0, (rgba & 0xFF) / 255.0 >;
}

 

I'm not quite sure what is happening here.  I see that it is deriving a vector from the integer sent to the function, but how is it splitting up the integer to create the vector?  Being able to send a color vector to a rezzed object in this fashion would be great.  But, understanding how it works would be even better.  So, any help would be greatly appreciated.

[Rolig Loon]

You are looking for Void Singer's last thread in these forums:

http://community.secondlife.com/t5/LSL-Scripting/Finity-s-End/m-p/1254183

In it, you will find both of the code snippets (uColor2Integer and uInteger2Color ) you are looking for.  Basically, all uColor2Integer is doing is grabbing the three components of the vector and assigning them to separate parts of hex integer, moving the Y to the left 8 digits and Z to the left 16 digits.  To decode the integer, she just reverses the process in uInteger2Color, grabbing the high bits of the hex integer and converting them to Z, the mid-level bits to Y and the low-bits to X.

 ETA: The particular function that you are looking at does one further step, converting a standard RGB color vector (<255.0,255.0,255.0>) to a normalized LSL color vector (<1.0,1.0,1.0>).  That's just arithmetic, dividing or multiplying by 255 as needed.

[Life Camino]

Thanks, Rolig, that was exactly what I needed!