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Kerkythea Rendering System • View topic - Perfect fisheye lens
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Perfect fisheye lens

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<<

2XMM2

Posts: 2

Joined: Fri Jul 05, 2013 9:57 am

Post Fri Jul 05, 2013 11:08 am

Perfect fisheye lens

For a long time now I've been searching for a viable way of doing fisheye renders with Kerkythea. I tried using modeled lenses with the dielectric glass material, and also using a reverse method with a spherical mirror ball. The problem with those is that they often get black or white lines crisscrossing your render, looking like the wireframe :cry: (most noticeable when rendering without AA)

However, after some recent fiddling around in Kerkythea, I found a very handy and simple way of doing fisheye! :lol:
Simply place a vertical plane in front of your camera (the front face needs to point towards the camera), either by placing it in SketchUp, or by adding a vertical pane in Kerkythea, and then copying over the coordinates of the camera (in the Advanced Settings window)
Image
Then you need to set the vertical plane's material to be [Dielectric / Glass], and add white to the refraction (no reflection though (Uncheck the Fresnel if you don't want the edge falloff)).
Now, if you set the IOR to be below 1.0, you get the fisheye effect, but it also increases the brightness, so feel free to adjust the weight of the refraction, or you can always adjust the exposure after render :grin:
You will need to experiment with the focal length and IOR a bit, until you get it to show the entire 180-degree circular image. (if you set the IOR too low, it will become very small on the render)
Image

Now just add some diffraction, and you'll get some pretty neat chromatic abberation (works best with BiPT, MLT & BMLT) :shock:
Image

Kerkythea is amazing! =P~
<<

Fletch

KT-Team
KT-Team

Posts: 8564

Joined: Fri Oct 27, 2006 2:38 am

Location: Milwaukee, WI USA

Post Fri Jul 05, 2013 12:01 pm

Re: Perfect fisheye lens

Interesting.
What is the goal of having the fisheye lens effect? Is is simply artistic desire, or you need a spherical camera?
You can of course choose a Spherical camera already in KT without any effort.


<<

2XMM2

Posts: 2

Joined: Fri Jul 05, 2013 9:57 am

Post Fri Jul 05, 2013 12:30 pm

Re: Perfect fisheye lens


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