need help getting speed.

[Tim Saunders]

here is a preview render of a project i am working on that is due tomorrow. i don't think i'm going to make it on time. there are a few changes that have been made since i rendered this like lighting brightness and some color adjustments and some additional trusses up above, but for the most part it is the same. it took 29 hours to render at 3000x2000 though. i am new to vray in the interiors so i haven't figured out the settings that will give me optimal render times (obviously). i know some of my glossy materials (steal lights, and the floor) are slowing things down a bit, but there has got to be some better settings. i ran this with adaptive subdivision aa, irradiance map with medium preset. secondary bounce-qmc at defalt settings. i only have about 8 omnis with vray area shadows. the hanging lights just have a self illuminating material under them to fake the lighting. any thoughts?

[Ismael]

Area shadows and glossy takes much time. Maybe do a shadow pass with all Standard Mats and Standard Shadows and no glossy. Then render again with glossy but no shadows and composite. Another thing; for example, remove Glossy materials from all geometry where is not going to show much in the final. From places like deep in shadow, too far from the camera, the back side of facing geometry, loose a leg or two on tables not visible to the camera.

 

Also keep an eye for glossy that sees glossy. That means a glossy mat reflecting another glossy, takes way long. 29 hours is definitely ouchie!!

 

Good luck and hope you can make the commitment,

 

Ismael

[Tim Saunders]

hmm...good thought on the passes. i used to do that with scanline, but haven't figured it out yet with vray. i know it must be somewhere in the g-buffer rollout(i think). how do i set that up?

[ecastillor]

Lookin good Tim!...but 29 hours??? ay!

 

try reducing the subdivs on your materials...especially those with glossines lower than one...

 

What version of vray R U Using?

 

Good luck!

 

If else fails, maybe send me the file and I can give a try

[Tim Saunders]

thanks ed. just barely upgraded from free to 1.47.03. subdivs are low, but not under 1. i'll see how things look in the morning. i'm at home now and i'll be back at my office in about 9-10 hours and i'll zip the file to you. what's your email? might be too big to post on the board. i tried to get the dr going to help things as well, but is keeps telling me the render host failed. both pc's ping fine. i loaded the maps in the files and all, but still no luck. i thought i would just try it on one computer first, then copy the map file and everything on each pc i network to. maybe later this week i'll get above water a bit so i can play with that a bit.

[JamesTaylor]

you'll find that dr is pretty simple to get going if your using max, but if your using viz then it gets a little more difficult, you'll need to capture a basic file that has been sent thro backburner as a replacement for the default versions installed by vray.

 

if you search a few forums, http://www.vray.info / http://www.chaosgroup.com you should find some instructions

[Tim Saunders]

you'll find that dr is pretty simple to get going if your using max, but if your using viz then it gets a little more difficult, you'll need to capture a basic file that has been sent thro backburner as a replacement for the default versions installed by vray.

if you search a few forums, http://www.vray.info / http://www.chaosgroup.com you should find some instructions

james, the guy at vizmaters said something like that. the problem is, i didn't use network rendering with viz before so i have no backburner from previous setups.

[JamesTaylor]

what version of viz are you using? i may be able to post the files you need, but i'm using a different version of vray, so it may not be great as it can be flakey at the best of times.

 

i think DR is one of the things that will be addressed in v1.5 when its released

[chutti]

Hey i dont see much VRAY effects in this image...

 

you can try the old scanline render settings....with use a lot of omnis,ambient omni and spots by controling their attenuation parmes...u should try. if done correctly and some color balance with ps your client wont notice. good luck

[Craig Ramsay]

If you can post a screen shot of your render settings then we might be able to spot where you are going wrong

[Tim Saunders]

viz2005. it looks like they're going to finish rendering on time. last night i decreased some values in the irradiance map to low and cut a few other corners for speed. still putting along, but it should finish. one of the three views is done. with the low settings i got some noisy like jaggies in far areas so i just fixed them with some blur in ps. the finals won't be ideal, but i guess they will have to work. i'll post the results this afternoon when the other 2 are finished rendering and i touch them up. i would still like to get the dr worked out though. any help would be great.

[Guest nazcaLine]

hi.

 

i'm new to vray,so i'm not an expert. but i've been reading a thread about rendering an interior w vray, w artificial lights.

 

they talk about making the first bounce w ir map and the second with photon map. i tried the technique and the times cut in half, compared to using QMC in the secondary.

 

unfortunately, the thread is spanish, but you could check it for the settings:

 

http://www.3dpoder.com/foro3dpoder/showthread.php?t=5474

 

hope it can help

[Tim Saunders]

thanks ed. the link makes me sign up for a new account. after logging on i have to search in the forums. not being a spanish speaker, would you mind navigating me to the thread. i assume it is on the forums pages. i got there, but is it listed under a topic? what is the thread called?

[Guest nazcaLine]

ok, go to foros 3d poder .now, Tecnicas 3D. now, Render, Iluminación y Cámaras. then, Temas fijos de esta seccion (it's at the very top). Once there, it's the first thread, called Iluminacion de un interior con vray

 

btw, this thread is considered a kind of legend or something like that, it's been mantained through years and it has about 7000 replies (no joke).

 

too bad is not in english. i'm a newbie in vray and it's been unvaluable to me, i hope it can help you.

 

good luck!!

[alfienoakes]

Hey tim,

 

If you find that thread usefull, you couldn't post the settings / results on here could you?

 

Would be interested to see them myself, only had a quick look at registering etc.. and then realised my Spanish was worse than yugoslavian!! (which I have never spoken!!)

 

Cheers

 

Andy

[Tim Saunders]

here are the finals. like i said before. they're so-so, but i wish i had the time to give some attention to some more details and propper lighting.

 

andy, i have a few minutes this morning i was planning on logging back on that spanish sight. i'll let you know if i find anything useful i ded re-render it last night with resetting my indirect illumination to irradiance map for primary and photon map in the secondary and like ed said. it redered in nearly half the time. and that is still keeping both bounce values at 1.0.

[Guest nazcaLine]

so it works!!!

 

i tried it only in a very small testing scene but your scene is large and complex, and it looks really cool!!

 

how many lights do you have in your scene? are they vray lights?

[CRD]

You should try the VRay support forum, if you post your image and your setting there, I bet you could get some better feedback.

 

I've been learning VRay for the past couple of months and I've got a couple of suggestions.

 

First, only use the presets under the Irr map for 800x600 or similar images. Every time you increase the size of the rendering from there,you need to decrease the settings. For your 3000x2000, try -6,-3, with 30 HSph subdivs.

 

Then turn on the Light Cache for second bounce. You can leave those at the default settings and be ok.

 

But one of the biggest secrets to learn is how to control the QMC Sampler to switch between test and final quality renderings.

Try these:

Adaptive=.9, Min Samples=8, Noise Threshold=.003, Global subdivs Mult=4. This will give you a nice quality rendering.

 

Then try these settings for a test render:

Adaptive=.95, Min Samples=4, Noise Threshold=.01, Global subdivs Mult=0.5

This should cut your time dramatically, but you trade off introducing noise into your image. But that's ok for test images because your lighting will stay the same.

 

Good luck and post your results with these setting so we can all see if they work for you.

 

Colin

[Tim Saunders]

ed,

i only have 8-10 omnis with vray shadows. i tried stretching a vray plane across the span of those huge chrome looking lights, but renders were slower.

colin,

thanks a lot. i'll give those settings a try when i get some time. hopefully tonight when i leave work.

[Ismael]

The renders turned out very good indeed. Will be looking forward to seeing more of your renders.

 

Ismael

[Guest nazcaLine]

i was thinking...maybe your very high render times were due to your using omnilights with vray shadows...did you use attenuation? i think that even using attenuation the machine has a really tough time calculating shadows in all directions, even more with ten omnis and a very complex model like yours...maybe you should try photometric or standard spotlights, i don't know...maybe fixing this issue your render times will decrease even more...

[Tim Saunders]

i'll look into that

[Tim Saunders]

when i use photometric lights the scene renders black, any idea why?

[Ismael]

That is because you are using "photon map in the secondary". That happens with photometric lights used that way with Vray. What some people have done is increase the multiplier for said lights.

 

Ismael

 

Edit**

 

Found this on a search "the problem of lightning with ies photometric lights with photons is that they are not strong to get proper lightning ...

 

here is my solution to fix this

 

just incrase the diffuse multiplier in vray light properties to about 180 - 200 for interior shots with closed space ... ;] nothing else to set ... just this multiplier ;]

 

the scene below is a closed box with exponetial colormaping and DK Multiplier set to 3,0"

 

That should give you some ideas with photometrics and photons. ****