normalToComponent seems to be wrong about three.js

[gero3]

I also Improved it a little bit

http://jsperf.com/threejs

This is only tested in chrome

I can confirm it's faster (50% or so?) but I don't know what the function is supposed to do, so I cannot help there :)

[mrdoob]

Yeah, I wasn't sure about that code, I couldn't verify it. I've implemented your code anyway. I tweaked it a bit though, this was even faster:

function normalToComponent( normal ) {

    var component = ( normal + 1 ) * 0.5;
    return component < 0 ? 0 : ( component > 1 ? 1 : component );

}