Spiky white light of death! (participating media test)

Lord of the Rings Junkie · Post by **Lord of the Rings Junkie** » Mon Sep 10, 2007 9:16 am

Just one prick and you're guaranteed to be in flames!

I'm just testing a regular lens against a fresnel version I made. Render is still cooking, but this is 40 minutes worth. Both lenses are 1 meter in diameter.

Sayris · Post by **Sayris** » Mon Sep 10, 2007 10:11 am

looks very nice

could you show how you set up the scene?

StompinTom · Post by **StompinTom** » Mon Sep 10, 2007 11:33 am

pretty fucking sweet! weird how its illuminating such a big area on the floor though... shouldnt it just be lighting up a tiny spot if its so focused?

SURFiNG · Post by **SURFiNG** » Mon Sep 10, 2007 11:34 am

i would like to watch the scene also, i don't understand why lights react on this manner

Lord of the Rings Junkie · Post by **Lord of the Rings Junkie** » Mon Sep 10, 2007 12:35 pm

Here's a screenshot of the setup as well as the .blend to play around with.

Heavily Tessellated · Post by **Heavily Tessellated** » Mon Sep 10, 2007 2:59 pm

Optics! I love optics. Sweet Fresnel, what order? 2nd? Did you design it or lift a pre-made lens from one of the many optics design programs available? OSLO LT and OpTaliX both have great lenses that can export in many formats, in their shareware versions. Makes me want quad CPU motherboards to get cheap enough to populate with quad core chips, though. (what's 16 cores between renderfriends?)

Kram1032 · Post by **Kram1032** » Tue Sep 11, 2007 1:59 am

very cool "light ripple" effect

I like it a lot

one thing, that's missing, to make it a perfectly realistic, (at least as realistic as indigo) render. If you have the patience, for that O.o: chromatic dispersion!

Lord of the Rings Junkie · Post by **Lord of the Rings Junkie** » Tue Sep 11, 2007 6:17 am

Here's where I'm stopping the render. Mark, if you want chromatic dispersion, feel free to render it!

@HT: I just made the regular lens in blender with what looked like a visually pleasing curve to it and made a fresnel version, so it's all my design.

The lens is easy to make, just a bit tedious.

Kram1032 · Post by **Kram1032** » Tue Sep 11, 2007 6:38 am

very good results - weak noise I like it VERY much

yeah, I probably could render it in 100x the time, you rendered THAT! xD - actually you could try to find an optics-physicist, who could need that as a nice test, what's the difference between frenesel and normal lens!

Insquall · Post by **Insquall** » Tue Sep 11, 2007 7:02 am

Try focusing a hdr image lol!!

Also there is alot of abberation in those lenses, does anyone know what the mathematically precise curve shape for a lens is?

alex22 · Post by **alex22** » Tue Sep 11, 2007 7:11 am

I think its x^-1 (hyperbel?).

Kram1032 · Post by **Kram1032** » Tue Sep 11, 2007 7:12 am

there are two possible ways to shape a lens:
1) spherical - easier, lower quality
2) aspherical - like a parabola, I think - harder to do, better quality
if there are any other types, I'm not aware of them..., so, pls add them ^^

Insquall · Post by **Insquall** » Tue Sep 11, 2007 8:16 am

I feel like trying this myself. Does anyone know of a good freeware/open source mathematical function graph plotter?

Lord of the Rings Junkie · Post by **Lord of the Rings Junkie** » Tue Sep 11, 2007 8:23 am

Two seconds of googling found myself this.

[Edit] If you're on Windows XP, download the powercalc.exe file from this page.

Kram1032 · Post by **Kram1032** » Tue Sep 11, 2007 8:47 am

powercalc is quite good - far more advanced than the basic windows calculator, but as he needs the output saved (as an image, I guess), that's not the most useful way to go (yeah, via screenshot, but I wouldn't really suggest that^^)

Spiky white light of death! (participating media test)

Spiky white light of death! (participating media test)

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