Hi Brian,

i went by this explanation, for a normal concave mirror, which is also easy to understand.

http://physics.tutorpace.com/mirror-formula-online-tutoring







Best regards
Stefan

Thanks Stefan.
That is a good tutorial.
- Brian

Hi Brian,

a little late...but this is the result:



Maybe i try as next Young's double slit experiment with Thea and MoI.

Best regards
Stefan

Hi Stefan.
Impressive results.
Maybe you could elaborate what is going on?

Part of white light beam reflects, part refracts
Refracted light again reflects and refracts, to rainbow, etc.
How is the rainbow of colors achieved. Does the color spectrum reflect physics and reality? (Within the limits of rgb colors?)

Is the prism flat on all sides, or concave?
So MoI made the prism?

- Brian

Hi Brian,

in order to see the light beam and the rainbow colors, volumetrics (for the scene)
and dispersion (for the prism) is enabled. Thea is one of the very few render engines
who can do this stuff and according to their slogan is physically accurate.

The prism (made in MoI) is flat on all sides and filleted at the edges. I used this form
of a prism to see how it compares to the Pink Floyd Album Cover The Dark Side of The
Moon. Maybe they used for their illustration a regular tetrahedron, rotated at a certain
angle, i don't know.

Best regards
Stefan

P.S. i always wanted to try this Pink Floyd Cover*, but if you download a trial of Thea Render
and check their sample scenes to download (Laser Lab) or look at their fantastic gallery, you
will see of course much better sample images, regarding this.

*I tried this with the free Lux Render years ago and Blender, but could not get the light beam
parallel, due to the lack of knowledge at this time.

Best regards
Stefan

Wanderful result Stefan!!

I haven't followed this whole thread (Gaussian Mirror) but I suppose that the rainbow effect and the refraction
are "simulated" and not physically rendered with the unbiased engine of Thea.

I say this because for what I've tested so far, doing a simple 4k render of a scene like this
took almost 8 hours on my i7-7700K and unfortunately the Unbiased engine of Thea is not GPU bound (like the superfast Presto engine on my 1080 Ti).

But if you have tons of cores then it should be possible to render a "physically" calculated refraction rainbow :)

Anyway...great result!!

Congratulation Stefan.

Remember this incredible free prog! ;)

Phun : now it's called Algodoo!
Try it : it's terrific! :)
http://www.algodoo.com