adnama

Hi,

I'm having trouble with long render times on an interior scene. The prepasses were going to take 3 days at a res of 3500x2625!

I've attached my scene but it is very much work in progress.

Can anyone help?

I'm using VIZ 2006.


Thank you !

Paul Stewart

Attached Files

Model Internal Kitchen 2.ZIP (815.1 KB, 39 views)

prodham

i don't use v-ray myself (i didn't notice that you posted under that forum) but i did have a look at the file since i use VIZ.

i am sure there are some v-ray settings that can be altered, but i did think that your raytrace max depth of 9 is quite high. maybe bring that down to 3 or 4 and that might help a bit.

best of luck

paul

eksg

Ei bro, i've downloaded your scene,and ive'd seen some issues.

-You have to many lights, try to reduce them.Use V-ray light material instead of v-ray plane.(thats what i used in the render)

-lower your hsph subdivs.

-save your irradiance map. you can save lower resolution irradiance map,then use it to your high res images.just experiment on what sizes would be enought to make a descent irradiance map for a high res render.usually,im using an irradiance map from a scene that is only 25% of the final image.there would only be some sacrifices on the details,but it would surely do the trick.

-there is something wrong with your model,there are overlapping objects.if these objects have reflections,it would cause also on longer rendering time.(look at this render,the black ones are overlapping objects)

i am not a technical guy in terms of v-ray, but these are just what i observed to be somehow making your scene to render slow.one more thing is that i think your radiosity in advance lighting parameters is turned on.put it off.i tried to render the image with a single material just to check the lighting, and deleted the accesories for faster rendering.i used an irradiance map from a 320X240 render, and use it on a 640X480 res.rendering time is 45 sec.

ive'd attached a test render of your scene.tell me if you still have any query.i hope it would help you.ciao!

Attached Images

1.jpg (114.2 KB, 95 views)

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Thablanch

There is a few things...

You are using Vray 1.5, in the rQMC rollout, the noise treshold default passed from .005 to .01. So, accordingly, render times are going up.

You are using QMC as second bounce, with 20 subdiv. For second bounce, 3 to 5 subdiv should be enough.

In that scene, I would personnaly use LC as a second bounce, First beacause it is fast, we are talking second bounce, so we do not need that much detail in calculations. Plus, you could use -use LC for glossies - way faster than interpolated materials, or even at rendertime glossies.

The IR map: Bigger the image, larger the samples you can use:
example: if you are rendering a 800x600 with -3,-1, a 1600 x 1200 can be with -4,-2, and so on... When doing a bigger image, you can speed the IR map this way.

The AA;
Adaptive subdivision is the fastest method when you have big plane surfaces.
In a situation with more detail, Adaptive QMC could give you faster results.

So now, it did render in about 40 min...with a pretty nice quality result..

What I love about Vray, it is so freakin fast.

Oh, and when using viz, make sure to turn radiosity OFF when starting the project, it can leads you to pretty weird stuff.

Hope it helps

BrianKitts

are you going to billboard with this thing? you could probably get by cutting back your resolution a bit....

http://www.cgarchitect.com/vb/21723-...er-stills.html

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Brian Kitts
ANSHEN + ALLEN