Christoph Hormann wrote:
> David Burnett wrote:
> 
>> Here's some test images from a quick patch I've created.
>>
>> I've let warp take a function so
>>
>>     warp {
>>         function{f_bozo(x,y,z)}
>>     }
>>
>> is now legal, working syntax.
> 
> 
> Such a feature was already planned for MegaPOV but not yet implemented. 
>  I don't really understand how you define a warp with a single float 
> function though.  The planned feature was supposed to use a vector 
> function.
> 
> Christoph
> 

It's just a straight forward multiplication
of each part of the original point by the results
of the function, so for the example images its
equivalent to...

f_crackle(x*f_bozo(x,y,z), y*f_bozo(x,y,z), z*f_bozo(x,y,z))

if f_crackle used form <1,0,0>,  with the advantage of only
having to work out the function result once (and nicer syntax :0)).


In code term, the important bit is

     POVFPU_SetLocal(X, EPoint[X]);
     POVFPU_SetLocal(Y, EPoint[Y]);
     POVFPU_SetLocal(Z, EPoint[Z]);

     value = POVFPU_Run(*((FUNCTION_PTR)(Warp->Function.Fn)));

     EPoint[X] *= value;
     EPoint[Y] *= value;
     EPoint[Z] *= value;


Any one is welcome to the code, I just want to tidy it up first
in proper pov patch style.

Dave.

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