.:: Indigo 0.9T5 and Exit Portal

tizxx · Post by **tizxx** » Mon Aug 13, 2007 8:06 am

Please someone can explain me wich of these images are
physically correct ?

The image indigo09t5-pt+exit-portal.JPG is made:
PATH TRACE + EXIT PORTAL
The image indigo09t5-mtl+exit-portal.JPG is made:
METROPOLIS + EXIT PORTAL
The image indigo09t5-pt+bidir+exit-portal.JPG is made:
PATH TRACE + BIDIRECTIONAL + EXIT PORTAL
The image indigo09t5-mtl+bidir+exit-portal.JPG is made:
METROPOLIS + BIDIRECTIONAL + EXIT PORTAL
The image indigo09t5-pt+bidir+no-exit-portal.JPG is made:
PATH TRACE + BIDIRECTIONAL
The image indigo09t5-mtl+bidir+no-exit-portal.JPG is made:
METROPOLIS + BIDIRECTIONAL
The image indigo09t5-pt.JPG is made:
PATH TRACE
The image indigo09t5-mtl.JPG is made:
METROPOLIS

deltaepsylon · Post by **deltaepsylon** » Mon Aug 13, 2007 8:21 am

should be mlt+bidir+no exit

Kram1032 · Post by **Kram1032** » Mon Aug 13, 2007 10:54 am

the absolute final result should be the same, though...

manitwo · Post by **manitwo** » Mon Aug 13, 2007 10:55 am

deltaepsylon wrote:should be mlt+bidir+no exit

is that an explanation?
stop talking shit

in theory all modes should give the exact same image after a given(unlimited) time - so every mode is physical accurate. The difference between those modes is how the noise converges. Some modes are faster, some slower for different things.

- MLT is good for indirect light, glass and caustics but not so good for direct light.
Generally the noise is kind of "dirty-patchy-nonuniform".
- PathTracing is good for direct light but needs longer for indirect light, glass and caustics.
The noise is uniform. (more maxwell-like noise)
- Hybrid is a combination of MLT and PT. Hybrid uses PT for direct light and MLT for indirect light, glass and caustics. Hybrid combines the strenghts of MLT and PT. If Hybrid is enabled the Metropolis option is ignored.

- Bidir can be combined with MLT or PT or Hybrid. Bidir makes noise in scenes with indirect light, glass and caustics clear faster. Bidir struggles with sunlight+glas (but afaik an exit-portal will solve that problem too)

once again:
Possible Combinations:
- MLT Mode: ("Metropolis"-true)
- Pathtracing Mode: ("Metropolis"-false)
- Hybrid Mode: ("Hybrid"-true)
- Bidir MLT Mode: ("Metropolis"-true, "Bidir"-true)
- Bidir Pathtracing: ("Metropolis"-false, "Bidir"-true)
- Bidir Hybrid Mode: ("Hybrid"-true, "Bidir"-true)

The last two modes are recommend.

to tizxx:
for that scene i would choose "bidir+hybrid+exit-portal".

Kram1032 · Post by **Kram1032** » Mon Aug 13, 2007 10:59 am

The last two?
I'd say, the first, the fourth and the last....
(first, if rendering with SSS, as there still are some bugs)

manitwo · Post by **manitwo** » Mon Aug 13, 2007 11:03 am

yes, if you haven't sunlight+glass (without an exit-portal), i'd say the last two modes are the way to go.

Kram1032 · Post by **Kram1032** » Mon Aug 13, 2007 11:08 am

Hmmm...
In the end, everyone decides on ones own.
I usually use the 5th...
CoolColJ wrote a thread, where he says, he prefers the very first...

manitwo · Post by **manitwo** » Mon Aug 13, 2007 11:15 am

do whatever you want!
i didn't say you have to use that or that - i tried to explain why some modes are better for some scenes than the others - thats all. i try to help.
if you don't agree with me - well, i dont bother. (except you can explain why)

deltaepsylon · Post by **deltaepsylon** » Mon Aug 13, 2007 2:30 pm

manitwo: how is that shit? he asked, i answered

Post by **OnoSendai** » Mon Aug 13, 2007 6:20 pm

Hi tizxx,
can you upload that scene?
It's a bit easier to test with than the teapot scene

tizxx · Post by **tizxx** » Mon Aug 13, 2007 8:51 pm

Sure,

Here the scene from MAX to Indigo 0.9.3c

Post by **OnoSendai** » Mon Aug 13, 2007 8:54 pm

tizxx · Post by **tizxx** » Mon Aug 13, 2007 9:18 pm

Ok, my considerations is others,
with Indigo, we have more possibility from others sofwares rendering,
to obtain special results and I don't think that the options on or off
(BIDIR, MTL, HYBRID) will produce the same result...

Now in Indigo 0.9 T5 I see and we see that,
When I put Exit Portal without BIDIRECTIONAL I Have the same result
with BIRECTIONAL ON and no Exit Portal.

Excused if inborn, and I address in particular to Nicholas,
that it is carrying out an impeccable job, but I do not succeed to understand because it is not possible at the same time to see the sunlight and the caustic ones.
A clean and too much dark shadow that covers all the pavement is not real and he is not even real not to be able to see the sunlight through the ball.

If i position a bulb lamp on a pavement in the vicinities of a window I see clearly through the glass otherwise it would not be glass. And at the same time I see also a shadow that the glass produces not completely but dark. I see only the contours of the thickness of the glass of a bulb lamp.

I know that I am asking a thing that today is perhaps impossible, but it would so much appeal to me to be able to recreate it to the computer.

This caratterisitc allows also important others
and real conditions of light…

sorry again

So these EXIT PORTAL what role have in the final result.
Does EXIT PORTAL necessary to have correct result?

If I put exit portal and I render out-side the room I see
a rectangle black area instead the windows.

many thanks to all,
and sorry for my bad english write.

I'am Italian...

deltaepsylon · Post by **deltaepsylon** » Tue Aug 14, 2007 2:01 am

You dont need the exit portal to have a correct result. Exit portals are for speed, because it tells indigo where to shoot the rays instead of shooting it at places with no opening

that's a quote from someone mostly

Kram1032 · Post by **Kram1032** » Tue Aug 14, 2007 3:57 am

Exit-portals ARE correct, except the fact, that they kill everything outside them.
If you don't cover a window,totally, you will get black frames, as all the light goes through the exit portal, NOT through anything else.

.:: Indigo 0.9T5 and Exit Portal

.:: Indigo 0.9T5 and Exit Portal

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