Klein bottle

[Aldaryn]

(click)

I wanted to do something interesting with a Klein bottle, so I made one, and started experimenting. Turned out I could only put together a rather simple studio setup, but since I rarely see Kleins on this forum, here it is.

Just to note, highlight in a full hdr workflow are giving the AA sampler a hard time. I know this is exactly how the actual algorithms should work, but there must be a way around...Stripe is from actual rendersize.

best regards,

A.

[Da_elf]

oooooo. i want one

[ene.xis]

looks pretty amazing to me!
great effort!

[werticus]

i just looked these up, because i'd never heard of them before, now i have a real glass one on the way :P

[DaForce]

Thats pretty damn cool!!

[Aldaryn]

Thank you very much!

It's actually quite tricky to get anything in, or out of this bottle. I'm trying to do a more interesting shot now, with some fluid inside, and a better light setup, but I'm having a hard time to get some highlights on the bubbles inside the fluid.

best regards,

A.

[m_hinks]

Thats cool, I think a view from more of a 3/4 angle would help to understand the shape.

[Candelero]

Super .... !

Do more cameras

Best regards,
nikki Candelero

[Aldaryn]

Strange, the whole point of this setup was to show the shape of this structure as clearly as possible. I've chosen this setup 'couse the light streaks on the sides almost draw the cross section of the glass. But it seems it's really not that unambiguous at all, as I have imagined. More angles are on the way, still experimenting. And trying to get those darn bubbles inside illuminated...

best regards,

A.

[pixelstudio]

Hmm pretty

i did not get the shape directly, so i looked it up on wikipedia, here's a photo of a real one :
http://en.wikipedia.org/wiki/Image:A...ein_bottle.jpg

[Aldaryn]

So, the experimenting continues. This is the last one out of the oven. I let it run in full res, so that I can post it here. The first one is the untuched render, minor gamma corrections. The second one is a funky try with simulated diffraction and light scattering inside the "lens" from the hdr renderdata, a bit more hazy look, but I don't really like how the diffraction turned out, can be tweaked further though.
The last one is a crop from original res, there you can see how crappy my AA is, and that this image still needs some more samples for the very bright reflections to clear out. This is giving VRay a hard time, I have to say, but well, I guess I'm not making it's job any easier.

The fluid inside is crap. Something goes very, very wrong there. Examine the last image, original size, you can clearly see, that there is something odd going on. Like there was two capillarities, and the body of the fluid simply renders "black", still letting some light trough though. I have turned off fog for this shot on the fluid shader, and as far as I know everything is properly modeled (intersecting borders) . Ignore the hexagonal bubble "shadows", my bad.

to be continued.

Best regards,

A.

[DaForce]

Thats looking good.

The black fluid is odd tho. Is the fluid mesh definitly intersecting the glass mesh?
ANd I assume you have affect shadows on in the material and refractive GI caustics turned on as well?

[MHenry]

Love the composition of the series of close up studies you have below your main render (vignettes). Nice study overall.

[Aldaryn]

I think I'm getting somewhere near a final render. This is a 100% crop from the almost final settings. This is the most problematic area of the picture, buckets tend to stay here for hours thinking about how this region would render...




Anyway, here it is, some noise still visible, but I think this will do for a final shot.

I wonder if there would be any way, to speed up glossy sampling of high contrast areas like this, like a global photon map is used to point rays at the right direction, maybe a modified caustics photon map thingee could be used to point reflected, refracted camera rays in the right direction. But I suppose this is more like a render theory subject.

The odd fluid was fixed by the way, turned out (again...) it was I who made a mistake, accidentally deleted half of the bottle mesh and somehow skipped it...

best regards,

A.

[Aldaryn]

Finished. Yay


Finally had some free cpu time to render the last one from this. I know after the others it's not that interesting, but here it is. Now with proper fluid. Rendered with adaptive DMZ 1-50, and in 5K res it took about 20 hours on a dual quadcore. Keep in mind, that this was only an experiment with some needlessly high settings.

Best regards,

A.