On Mon, 17 Feb 2003 14:59:55 EST, obj wrote:

> Greg Edwards wrote:
>>Some aspects are still lacking but this took a full week to render! The
>>water looks milky because of bad media settings but I don't think this will
>>interfere much in the rad load render. (dat's right, this WAS ONLY THE
>>SAVE!) I've really gotta cut back on these effects...
>>
> 
> hi greg ...
> 
> found your post via a search for balloon ...
> just beginning to try building one and how to go about it.
> any chance of sharing the isosurface portion of the code?
> 
> thanks
> -obj-

Well the basics of it was to take a cylinder and add a sine wave about the 
theta to it. All the troughs of the sine wave were inverted by taking the 
absolute value (making 2 bumps per sine wave repeat). The rest was playing 
with functions to get the width right and clipping with ordinary CSG. 
Here's the function I used, and I might make the whole thing available if 
people want it and I can manage to clean up the cancerously messy code 
(1609 lines ATM).

#declare f_Balloon =
function
 {
  x*x+y*y*y-y*y+z*z-abs(sin(atan2(x,z)*12))*-(pow(((y*2.1)-1.1), 2)-1)*0.02
 }

Good luck! Just make sure to give me credit where you happen to use it, and 
let me see your results! :-)

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