Fresnel lens

Tys · Post by **Tys** » Fri Jun 22, 2007 10:35 am

Oi!
I modelled a fresnel lens, put it in a triplet, and it worked! Not quite exact as the more voluminous counterpart, but it did!
green image is the fresnel, red the 'real' lens.

here the used setup, minus the blackbox:

Wedge · Post by **Wedge** » Fri Jun 22, 2007 2:40 pm

Cool test!

Dacksoldier · Post by **Dacksoldier** » Fri Jun 22, 2007 4:18 pm

umm i'm jw what are all of the lens types and wher i could find then cuz i would really like to model one but i can't find any like designs ro anythign and i guess i just ofund out tha fresnel was a lens...also

Ricky · Post by **Ricky** » Fri Jun 22, 2007 11:18 pm

How you modelled the fresnel lens?
And with wich program?

Thank you,
Ricky

matsta · Post by **matsta** » Fri Jun 22, 2007 11:38 pm

wow not to sure about how this is meant to work. but it looks amaaaazing!

greetz
mat

Labello · Post by **Labello** » Sat Jun 23, 2007 12:06 am

i dunno what its supposed to be o.O

SimonLarsen · Post by **SimonLarsen** » Sat Jun 23, 2007 12:08 am

http://en.wikipedia.org/wiki/Fresnel_lens

Labello · Post by **Labello** » Sat Jun 23, 2007 12:15 am

ah okay so it´s an improved lense... all right... and what should we see? what exactly worked? the magnification or what!? o.O

Tys · Post by **Tys** » Sat Jun 23, 2007 4:12 am

Labello wrote:ah okay so it´s an improved lense... all right... and what should we see? what exactly worked? the magnification or what!? o.O

It is a kind of flattened lens, and I was just delighted to see it work. The triplet English,w/o image is a simple form of an objective, used in cameras or a slide-projector.
In the second picture you see the red and the green F's in the background, these are meshlights. The light then travels through the lenses and hits the canvas. The first picture is a capture of the canvas.
I modelled the lens (and the rest of course) in blender.
Used a circle a a helper object to match the shape of the lens, then put a 100 vert circle perpendicular to it, extruded it, resized it, and so on.
Then I flattened the lens layer for layer, adding a group of verts via loopcut each time.

Kram1032 · Post by **Kram1032** » Sat Jun 23, 2007 5:06 am

amazing! But you need to also simulate the quality loss: chromatic dispersion

Ricky · Post by **Ricky** » Sat Jun 23, 2007 5:42 am

Thank you very much... I'll take a look.
Ricky

Tys · Post by **Tys** » Sat Jun 23, 2007 6:36 am

Kram1032 wrote:amazing! But you need to also simulate the quality loss: chromatic dispersion

Even if I did, you wouldn't be able to see it in the image. It is plain red and plain green light;p

Fresnel lens

Fresnel lens

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