VRay Settings for High Quality Interiors

[plaguelord]

the example

Both pictures have the same settings, except the GI samples.

One picture takes 30 seconds to render, with GI Min rate -7 and Max rate -5
The other picture took 206 seconds to render, with GI Min rate -2 and Max rate -2 , looks better, BUT, you can see LIGHT CIRCLES on the panel....
HELP!

[Hamburger]

What lights do you have in your scene?

[plaguelord]

I have only one VRay Light on the window of the kitchen.

invisible checked
color 201-247-255 Mult. 12
Smooth surface shadows cheked
sampling 8

and Vray Light Propierties I have diffuse subdv 250

[Hamburger]

Well I think the only thing you can do is increase the number of GI samples. When you're doing Gi with white objects it's very easy to see errors, if nothing improves try putting a texture onto the walls. Sorry I can't help you more but these are the only suggestions I have anyone else here have any suggestions to help plaguelord out?

[percydaman]

can you post a screenshot of all your settings? Also a screenshot of your scene? Try lightmapping for your secondary bounces. If you like, you can email me the scene, or a proxy of it and I can take a look. Ive been using vray for awhile now:)

[plaguelord]

thanks percy, I know you are a very good at vray, I'm glad to receive your help. Can you pm your mail? I will send you my scene with proxys.

[percydaman]

okay having looked at your scene heres some suggestions. If they seem obvious forgive me.

1. your AA was set to Adaptive 2,4. Waaay overkill. 0,3 is what I use for final renders.

2. Your colormapping was set to HSV, which is good, but frankly your settings washed out the image. I rarely use HSV, but will when really needed. Start your HSV at 1.0, 1.0 and then adjust if absolutely necessary.

3. Your environment override for GI was set to 3. Multipliers greater then 1.0 can frequently cause artifacts that you might have been having.

4. You dont have a wall behind the camera, so you had your 3.0 multiplier skylight giving light from behind. Not neccesarily bad, but also washes out the light in the image.

5. -3, -1 is pretty good for your Irradiance map. Set the preset to medium and then change the Max and Min to -3, -1. I usually use -4, -2 for tests. -2, -2 is no good because your scene has alot of large flat surfaces that dont even need -2 samples, -3 or -4 is fine.

6. Use vray materials WHENEVER possible, they are ALOT faster. Your curtain material is a standard material with lowered opacity. Vray hates that because its a dedicated raytracer and will force rays through it, and the scene slows alot. so stay away from those wheverer possible. It can also contribute to artifacts.

7. If you have access to the beta, try lightmapping. When used for secondary bounces, its pretty dang fast. Until the 1.5 version though, you have to use all vray materials.

[plaguelord]

Thank you so much for taking the time to check my file!

Now my questions:

Why AA 0x3 is better than AA 2x4 ? I have a lot of edges and I want them very soft and defined. I dont lose quality with 0x3?

When I have to increase the min rate of the irradiance map? or -4 -3 is useful for all the cases?


thanks, I'm testing the changes right now! :bounce:

[percydaman]

2,4 is way overkill. Your talking about taking 2-4 samples per pixel! thats just unneccessary. Believe me, 0,3 will work 99% of the time. Add glossy reflections or DOF and your render will absolutely crawl!


-4, -3 is a good start for minimum samples. Think of the sample size as well, the size of the sample. negative numbers undersample, positive numbers oversample. if you have alot of large flat surfaces with not alot of detail (think a wall or counter or any other flat surface.) then -4 or -3 is fine for minimum. For max samples, think how many samples you want for finer detail. Where surfaces meet.etc -2 is good for testing, -1 or even 0 is good for most final renders.

Like I said, I usually use -4,-2 for testing, even -5,-3 sometimes. For final Ill use -3, 0. Then your threshold settings will further help to get good detail. Just use the presets for that. I still do for most part.

[plaguelord]

Percy, I'm trying to re-render the scene with the new settings, to compare quality and render times, the time is almost the same, I speed up a lot the window area with the rvay curtain material. But the white spots appear again.
The main changes are the AA 2x5 changed to 0x3, and the Gi samples -3x1 changed to -4x0. And some max material for vray replacement.
The red areas show error spots, the blue area, shows missing detail compared to the old picture, in the old version I can see the little black holes of the wall-plug, this can be the AA right?
Another question, can you explain me a little bit about the Gi Hsph. subdivision and Interpolation samples?

[percydaman]

whats your environment override multiplier set to? Also try removing the curtain and see if it goes away. Also try hiding that plane outside the window and see what happens.

[plaguelord]

its still on 3, but if I lower it, I must add some lights manually. I'll try without the curtain. But remember, the curtain now its a vray material.

[percydaman]

I actually turned off the skylight and was able to keep it light. I put a back wall for light to bounce off of. I then created another vraylight behind your other one. Set it to spherical and gave it a light blue color. Gave it no decay and thats your Ambient blue light type. Set your planar vray light more white and then started adjusting the light intensities. I also had your HSV set to 1.0 1.0. I didn't have any issues with those color spots. whats the material settings for your curtain? make sure you have the refraction IOR set to 1.0. Make sure you dont have any raytrace materials or metal shaders. Also check the crop box on all your materials that use bitmaps, even if you dont need to crop them, its a known bug. Let me know if none of this helps.

[plaguelord]

wow, I did not know the bitmap crop bug, its good to know that!

the curtain material already have 1.0 ior. not raytrace, and no metal. I'll try to make the lighting based on the spherical light with no decay, and the bounce wall.
Thanks a lot for the help, I'm learning a lot and I hope more cgtalkers are learning too :thumbsup:

[percydaman]

cool.:) The reason for the spherical light to replace the skylight is that if you have an enclosed space where light only really comes from a small window, then your not going to get much useable light from the skylight in your scene. So you end up bumping it up alot, which causes problems.

[plaguelord]

I found the problem!

this is a render with environmet override 1.0 , no curtain and no high render time glossy materials.
You can see more clearly the colored spots. They are cause from the background plane, it has a material with a hdri bitmap.
The good part is, I lowered the render times a lot. like 2 hours for a full picture. with the new settings.

[plaguelord]

BUT, I don't have the solution... :sad:

This is a render WITHOUT the HDRI on the background plane, and all objetct on the scene. All materials, I also added a WALL behind the camera, and a Sphere Vray Light with no decay, and set to 1.0 on the back/right position. Checked all apply crop bitmaps.

Now the problems:
The picture look to grainy.
Something strange happends to my floor reflection.
If still have the background plane, now with a rendered version of the hdri, but now in bmp format, I put on the plane as a texture. But I can't see it on the render behind the window.
any ideas?

[percydaman]

not sure why the background isn't showing anymore. Maybe its not self-illuminated? Hide everything but it and see what you see when rendering. I was getting pretty decent renders after about 20 mins, but it was your pretty basic scene.

[plaguelord]

If I hide everything expect the bg plane, I see the bitmap texture without problems, maybe some problem with the window glass? I will make some test...

what you suggest agains the grains on the large plane areas? increase gi sample rate?
like -3x1 ?

[percydaman]

it depends on what is causing the grain. Increase subdivs for your lights, and increase your Hsph samples to say 80, see how that works.

[elijah'77]

HEY GUYS any of u know how to solve this flicker problem when u render the animation with vray.... how do i solve this?

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