Re: [Algorithms] Flipping/Rotating through all possible combinations

[James R. <ja...@fu...>]

If you can assign values to your axes and index them through those 
values, something like this should do it:

src[ 0 ] = x;
src[ 1 ] = y;
src[ 2 ] = z;

for( dx = -2; dx <= 2; dx++ )
{
    for( dy = -2; dy <= 2; dy++ )
    {
        if( dx != dy )
        {
            for( dz = -2; dz <= 2; dz++ )
            {
                if(( dx != dz ) && ( dy != dz ))
                {
                    x = src[ abs( dx )] * sign( dx );
                    y = src[ abs( dy )] * sign( dy );
                    z = src[ abs( dz )] * sign( dz );
                }
            }
        }
    }
}


Zafar Qamar wrote:
> Hi,
> I have done a water-shader but it looks like some of the values I'm 
> refracting to may be wrong, hence picking up wrong sides of an 
> environment map.
>  
> So, I want to try _all possible iterations_ of swapping or negating 
> x,y and z axes
>  
> eg.
> 1) x = -x
>  
> 2) x= y
>  
> 3) x = y
>    y = z
> 4) x= -z
>     y = x
>  
> etc
> etc
> etc
>  
> Does anyone know of an algorithm for going through all possible 
> iterations?
>  
> Cheers
> Zafar Qamar
>  
>
>
>
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