Optics

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olishea
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Re: Optics

Post by olishea » Fri Oct 02, 2009 3:35 pm

thats amazing
Oli

Chris
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Re: Optics

Post by Chris » Mon Oct 05, 2009 12:46 am

A dispersion clock :lol:


Solo
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Re: Optics

Post by Solo » Mon Oct 05, 2009 12:52 am

You know you need to explain how on gods earth you did that! :shock: :gj:

Chris
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Re: Optics

Post by Chris » Mon Oct 05, 2009 1:04 am

:D The scene is fairly simple. The same concept of using a high intensity spot light through a narrow 'slit' in the outer wall. Animation is SketchyPhysics 3, just using a 'motor'

The render preset is the Interior + Animation preset modified to only have 10 iterations (which is why the quality sucks!).
The prism uses the attached library, which is just simple glass with dispersion enabled.

You don't have to install the library. You could replace the prism material with diamond. If you don't either install the library or replace the material, it will obviously not render correctly. :)
Attachments
Prisms.zip
(5.1 KiB) Downloaded 176 times
prism_rot.skp
(78.36 KiB) Downloaded 190 times

rangerrick
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Re: Optics

Post by rangerrick » Mon Sep 26, 2011 9:12 pm

That is a fantastic scene you created Chris. Really quite amazing. I spent a lot of the weekend playing with your scene and some different refraction senarios.
I tried one that simulates two laser beams through a rectangular glass block. I only wish that the beams would show passing through the glass block. I had to
postpro that part. I tried many render presets but the best result was with BiPT. Even tried using the volumetric environment with limited success using the easy
presets to show the beams.

Here are a few of my laser results, including your scene at a higher resolution. I had fun playing with this. Thanks for the skp file.
Attachments
laser_ps_1000x460.jpg
laser_ps_1000x460.jpg (390.74 KiB) Viewed 4636 times
laser_2_prisms_sml.jpg
laser_2_prisms_sml.jpg (201.99 KiB) Viewed 4630 times
chris_refraction_final.jpg
chris_refraction_final.jpg (283.2 KiB) Viewed 4395 times

Chris
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Re: Optics

Post by Chris » Tue Sep 27, 2011 3:52 am

Awesome! The second one looks really realistic.

Yeah, I wish that you could see the light inside the prism too; one of the engine limitations.

derei
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Re: Optics

Post by derei » Tue Sep 27, 2011 5:56 am

rangerrick wrote: I only wish that the beams would show passing through the glass block.
For that, you need to use a glass with SSS, because in real life, common glass scatters a little the light, that is why you see the beam passing trough glass. Just in renders, the glass is perfect :mrgreen:
ARTIST AND DESIGNER DEREI.UK

Chris
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Re: Optics

Post by Chris » Tue Sep 27, 2011 2:25 pm

That won't actually work in Twilight; the SSS supported by the render engine won't produce that effect. The line of light you are seeing in all the images is where the light intersects the ground. It would be nice to be able to see that same effect in the prism, however there is a render engine limitation that light exiting a surface can't be reflected or refracted back through that surface a second time. That's why you don't see the line of light on the ground through the prism.

rangerrick
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Re: Optics

Post by rangerrick » Tue Sep 27, 2011 3:12 pm

Chris wrote:however there is a render engine limitation that light exiting a surface can't be reflected or refracted back through that surface a second time.
The million dollar question, you being the programmer.......is........can you fix it? :! :)

Chris
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Re: Optics

Post by Chris » Tue Sep 27, 2011 3:47 pm

Not for the render engine (which as you know is Kerkythea). I'm not sure if this is something that can be easily fixed in the engine; It may be a pretty low-level foundational behavior of the rendering method.

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