[Boris Ulzibat]

I ahve already posted one image in "Maxwell" section of forum, but i guess it deserves being taken to the WIP/Challenges section.
So.
My first attempt to create a "IES"-like light was this:

It is a plain tube with a 0% roughness aluminium preset and 3 cm inner radius, 6 cm length. Inside it there is an 1-poly emitter 0,5*0,5 cm facing upwards. the emitter position insode the tube provides different patterns, in this case the emitter is in the bottom part of the tube.

In my second attempt i decided to go a little further.
I created a hollow cone (same 3 cm inner radius in widest part, same lenght) with the same reflective melat material, and a "lightbulb" a flattened dome about 0.2 cm thick made of pure glass with some faint bump on it.
This time the emitter inside is 0,1*2,0 cm and is facing "down" (to the inner part of the cone).
This is a result of a quick test scene i made up for it.


Any comments and ideas welcome!

Just a close-up render of the second test scene.
Better detail in caustics.

[Thomas An.]

Interesting test.
Instead of describing the emitters ... can you show a close-up wireframe of their geometry ?

[Boris Ulzibat]

Interesting test.
Instead of describing the emitters ... can you show a close-up wireframe of their geometry ?

Sure, here it is!

[JCAddy]

That looks fantastic Boris! Thanks for the explanation.

Can you share the max file so we can see what we can come up with from your geometry?

[Boris Ulzibat]

That looks fantastic Boris! Thanks for the explanation.

Can you share the max file so we can see what we can come up with from your geometry?

Sure thing.
Here it is - the glass part needs some more subdivision!
http://www.bambr.net/renders/ies.3ds - 160 kb[/url]

[Thomas An.]

Sure, here it is!

Thank you Boris !

[Boris Ulzibat]

Sure, here it is!

Thank you Boris !

Is it saved correctly? I am on a Mac, so no Max to check it

[JCAddy]

Thank you very much Boris. I'll post some results later on in the week.

How long did that render go for? The 2nd image.

[Boris Ulzibat]

Thank you very much Boris. I'll post some results later on in the week.

How long did that render go for? The 2nd image.

Actually this one rendered quite long. But it turned out that was because of poor skylight use. Later i deleted the walls and used multilight to adjust the ambient light. Then it renders to sl 11 in 1 h.

[Boris Ulzibat]

Interesting test.
However, imo the problem is not to achieve realistic spot effect ; sure we can. The problem is to make them usable (read "usable rendering times") for a real production, eg, interior scene with a lot of them!!!!

The ones without glass cover are actually not slower than plain emitters.
The ones with the cover are slower, but not much.
a scene with 2 such emitters and Physical sky and multilight rendered to SL 13 in 3h on my dual 1,8 Powermac. 500*800 pixels.

[Boris Ulzibat]

Updated test scene with a better (and more optimised) image!
SL 13 at 3h.
Would be around 40 minutes on my MacPro, which is sadly being repaired now...

[big K]

looks good !

interesting test you have going on here.
maybe you could try what happens with mabe 20 spots like this in an interieur shot. the noise level would be interesting.

cheers
michael

[Boris Ulzibat]

looks good !

interesting test you have going on here.
maybe you could try what happens with mabe 20 spots like this in an interieur shot. the noise level would be interesting.

cheers
michael

You are reading my thoughts!
Here it is:


SL 12@3,5h which really is not bad, there is 15 such lights and nothing more.

[JCAddy]

Not too noisy either!

Nice test.

[tom]

Very nice test and excellent update Boris! Do you think the caustic patterns are very prominent about detail?