atrium w.i.p.

[haza]

hi all,
this is my first forum-post picture and this is my first serious job using vray (1.09.03r )
the position of the camera and the lighting is demanded by client.

I dont know if the picture with IRmap can help to solve my problem but anyway: how can I avoid those blury noise in the picture? this picture is 700x1120px and i temporarily replaced all my materials by white (or grey) plastic to see the GI.
- all window frames, sunlight shaders, lifts will have brushed-metal material. But when I tried to render the IRmap and the final picture with that metal applied it took over 4 hours on my 2x2.0 Xeon and the metal was totaly grainy. ( with adaptive AA set to min -1 and max 0, and metal material subdiv: 3 and depth of refl: 1 - as you can see on picture 3). next problem is that client wants the final picture of 3500x5600px !!
(I know the colormapping should be better but that's not what I would like to solve now.)

Do you have any suggestions how to decrease that terrible rendering time?

thanks a lot
and sorry for my poor english

haza

[percydaman]

looks like a great image. You need to post screenshots of EVERYTHING! materials, render settings the whole lot. for AA, undersampling just doesn't cut it for final renders. for a minimum AA settings, start with 0,2. That might help with the noise. Like I said post screenshots of your scene, materials, and all your rendersettings.

[natty]

hi Looking good so far ..... your AA is way to low try 0,3... your subdivs for the metal mat is to low 3 .... should be around 8 minimum.. looks like your Irr map is to low also ... you caould try to hide all your glass calc the imap then render from that with the glass on ...will save you time.

also looks like your light Subdivs are to low aswell ..

[haza]

ok
so here are screenshots:
screenshot of the scene and render settings are for the ''grey material scene'' and screenshot of material is my desired metal - after little corrections of subdiv. parameter which is now set to 9.

first of all: I know a lot of my parameters are set too low but I don't want just to simply set everything to high param. and go for vacation for a few days

I know I have to increase IRmap values but I dont exactly know which is more important for my scene because it contains a lot of detailed objects.
I also know about creating IR map with glass object hided and reflection switched off as well. (which is realy faster)
You both said I have to try increase AA when rendering final image with metal material added.
But when I want to generate final image even on small resolution (under 1000px) it take a lot of time to achieve nice looking brushed metal and perfect non-jerky lines of glass mullions...

thank you

[UBIKmh]

Raza,

With that amount of detail I'm afraid you'll have to get used to big rendertimes. About the size of the output: you could do a 4000 pixels high image and then blow it up using the program s-spline, much better then bi-cubic photoshop.

Your biggest problem is the shadows. if you're looking at a shadowside, Vray tends to be slower and your hemisphere subdivs become very important. 40 is too low, 60 to 70 is better. You could also fake it, make a weak extra sun to help the shadow part a bit.

If you have a good irrandiance map with a 1500 pixel height, you might consider using that when you render a bigger size.

hope it helps,

Marc

[haza]

Marc,
as I understood, do you think I can calculate and save smaller IRmap resolution for example 1200x2400 and then reuse it for the final image of 2400x4800?
it could save time while rendering IRmap at least. nice trick

[percydaman]

yup I was afraid your Hsph subdivs were too low. Like UBIKmh said, raise that, and like natty said raise those glossy subdivs, and I think itll look alot better.

[haza]

ok
thank you all, I think I have a lot to do on it. Anyway I'll post here the final image.

[Da_elf]

ummm. why the sphere around the scene? seems to me that would slow things down more than anything.

[pengo]

Good from now but could be better with more hsph like other said above

ONLY TO KNOW YOUR PROCESS!

Why do u use sphere around the model ?

To map better the background image?
To map it with an hdri and tto hide it to the camera?
To get a contribute on GI solution?

Who use this technique or better who has a trick with a sphere to speed up the gi solution?

I'm curious to know that from the user here in this thread

THanks in advance

bye

[haza]

Da_elf, pengo
that sphere was the rest of previous settings for MentalRay, I don't use it for Vray calculation. I just simply didn't erase it while generating screenshots. And the sphere helped me to fine tune the GI solution.

[haza]

so, here is the result of my first work with VRay.
the final image was 3000x4800 ... please don't ask me about the terrible rendertime
please C&C
the image in full resolution you can find here:
http://www.haza.host.sk/atrium2.jpg

[haza]

sorry, this could probably work well:
the hires picture
and small preview:

[natty]

you've done a great job just blur the shadow a little on the first guy...

so what was the terrible render time..?

[haza]

the first attempt was something about 20 hours.
But because of no deadline and incoming weekend I decided to avoid grainy blury reflections of the metal and I rendered it with higher QMC.
It was 44 hours.
Maybe my 2xXeon 3.06 HT is too slow.
I promis, next time I'll be a bit faster