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Optics

Posted: Thu Oct 01, 2009 8:01 pm
by Chris
I was playing around the other night with optics too. The prisms both use the diamond library material and the mirrors are architectural glass, perfect mirror.

The render sucks, overall, because I didn't put any actual effort into it, but I though the effects were cool.

DOWNLOAD SCENE FOR TWILIGHT RENDER V2 HERE:

Re: Optics

Posted: Thu Oct 01, 2009 8:36 pm
by Ecuadorian
I gave up trying to achieve that effect. Care to share the render settings and how you made the light beam?

Re: Optics

Posted: Thu Oct 01, 2009 8:59 pm
by rbissett
Very cool Chris! That was my next idea...use a laser beam. How'd you do that?

Re: Optics

Posted: Thu Oct 01, 2009 9:13 pm
by shura
Over here no results as well...

hum, I have a projector light with a width of 5, light strength of 600 (!), bulb size of 1 and colour white (of course) --- the beam enters the prism, gets fractionized but does not leave the prism at all. Do I have to do something to the backface of the SU material?
Am I right assuming that cast shadows and soft shadows doesn't matter in progressive, does it?

Re: Optics

Posted: Thu Oct 01, 2009 9:56 pm
by Chris
Here is the scene.

To answer your questions, 'Cast Shadows' is ignored but soft shadows does matter. I have it turned off for the light in this scene.
The trick to creating the light beam is actually to shine it through a narrow slit in the wall (lower left in the image). This creates the "linear" light projection. I used a very intense spotlight, strength = 1000. Also note that the light is tilted downward slightly. This ensures that it leaves a trail of light along the ground.

What I really like about this scene is that you get not just the refraction in the prism, but a primary and secondary reflection.

Re: Optics

Posted: Thu Oct 01, 2009 11:27 pm
by Gaieus
OK guys, next thing is to build a spectrometer.
:roll:

Re: Optics

Posted: Fri Oct 02, 2009 12:03 am
by rbissett
Gaieus wrote:OK guys, next thing is to build a spectrometer.
:roll:
Psychic! I'm working on one now. I made a real one in high school with a diffraction grating. Trying to model a DG crashed SU. Shoulda used a Component. Now trying a prism type. No idea how to model the lenses vs. focal lenth, etc.

Re: Optics

Posted: Fri Oct 02, 2009 12:45 am
by Fletch
I want a Twilight Telescope or Microscope... hope you can build us one :?
This site may help?

Getting a perfect lens built in SketchUp should be a fascinating challenge. :ugeek:

This guy managed something pretty good.

Re: Optics

Posted: Fri Oct 02, 2009 7:42 am
by notareal
With a telescope or a microscope, I think modelling accurate enough lenses or parabolic mirrors is the main problem. Second problem might be caustics, if they are needed to see trough dielectric material and you have to use unbiased rendering. So as long as you are projecting the image from the telescope or the microscope, you should be able to do this.

Re: Optics

Posted: Fri Oct 02, 2009 7:45 am
by shura
Thanks for the skippy Chris! I'll give it a spin tonight... cheers alex