On 4/17/2024 12:17 PM, Cousin Ricky wrote:
> On 2024-04-17 08:28 (-4), RATH, CHRISTOPHER A wrote:
>>>
>> This is a ways from being done, but I wanted to share the updated image
>> with the bubbles fixed.  The balloon texture is still not quite right,
>> even when I render with radiosity (which this version does not).
> 
> I doubt radiosity makes any difference here.  I would give Alain's
> suggestion of blurred reflection a try.  If you haven't seen it yet, the
> technique is at:
> 
> https://wiki.povray.org/content/Knowledgebase:Language_Questions_and_Tips#Topic_13
> 
> To avoid having this technique stall and take forever, use Alain's
> modification:
> 
> https://news.povray.org/49b9809b%241%40news.povray.org
> 
> And I would cut the reflection in half or even lower; and if you're
> using finish-level Fresnel, remember to use the reduced reflection as
> its argument:
> 
> finish
> { fresnel 0.5
>    reflection { 0.5 fresnel }
>    conserve_energy
>    ...
> }
> 
> The reflection of the water highlights on the right edge of the balloon
> looks suspiciously metallic.  Is this not a rubber balloon?
> 
I looked at the code for doing the blurred reflections and started 
experimenting with it.  I was able to get a nice blurring mirror using 
CSG objects and this technique where I can play with the variables.

However, the balloon is an isosurface with a pretty small accuracy value 
to remove artifacts, so hitting it with 40X more rays drops the 
rendering to a halt.  I can get it to go with a small blur count, but I 
don't think that will give me the blur effect.

I'm still playing with it.  If I can find a good way to create the 
balloon using CSG instead of isosurfaces that may be the better 
solution, since I don't need a bumpy surface.

-- Chris R
-- 
-- Chris R

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