clipka nous illumina en ce 2008-12-23 13:52 -->
> "SharkD" <nomail@nomail> wrote:
>> I've created an aircraft engine and would like to create an area behind it that
>> is distorted due to the heat from the exhaust. What's a good way of achieving
>> this?
>>
>> -Mike
> 
> That's a tricky one.
> 
> A naive attempt would be to create a transparent cylinder or cone with a
> slightly different ior and a disturbed normal. But then you'd get total
> reflections at the outline of that object, which will be a mess if the surface
> is turbulent enough to be noticeable at all.
With an ior just very slightly less than 1, as the heated air should be, that 
effect will only affect a very narrow area and may not be noticeable.
You can use 2 cylinders or cones, or a cylinder and a cone. The outer one get an 
ior around 0.999 and the inner one about ior 0.99.
You can also flatten those: scale<0.5,1,0.5>. This will make the areas where the 
problem may occurs even smaller.
> 
> An approach I did was to put a plane (no, not the aircraft :)) parallel to the
> "screen", using a slightly different IOR for the "rear" side, and setting up a
> function to be turbulent only in those areas where the exhaust should be
> visible.
> 
> Drawback with this one, though, was that I found it to create artifacts when
> combined with media, which you may possibly want to use for some engine smoke.
> 
> So if you find some solution that really works, please by all means post it here
> :)
> 
> 
> 


-- 
Alain
-------------------------------------------------
   I knew a girl so ugly that she was known as a two-bagger. That's When you put 
a bag over your head in case the bag over her head comes Off.
	Rodney Dangerfield

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