Color mapping HELP!

[Msamir]

Take care when using omnis because they do increase render times.

[Chad Warner]

I'm actually embarrassed to have to ask this, so sorry Devin but I'm going to ask it in your thread instead of starting my own

 

What's the fix for the problem (in Vray 1.5RC3) when you have a wood floor (with color, bump and glossy map) that gets really blurry as it recedes from the camera? I know I've read about fixing this more than once on this forum but I can't seem to find it.

 

Generally, you want to turn the bitmap blur to .01 or .001, and the bitmap filtering to none. That'll help with the blurring of the map over distance.

[Ernest Burden III]

Take care when using omnis because they do increase render times.

 

Sure, but one or two omnis per chandelier would still render faster than eight IES lights, and have just as good as an effect.

 

You should step back from simulating the chandelier to think about what the general effect will be on the room. A bunch of small lights will merge into an overall effect that can easily be done with one or two onmis. I hate omnis, but this is where I use them.

[Sawyer]

You can also hide the glass/window objects and render with a default grey vray mat. That would let you isolate the time that the materials are contributing to the scene. I don't know how much of the glossy effect you will see but it will really add up in the overall rendering time.

 

Now about color mapping have you tried using the color correction plugin? It is important to use it if you are using LWF and you have materials that have their color based on the color swatch not a bitmap. Or just eyeball it.

 

Also what material are the lamps? I imagine a vray light mat will be much quicker than anything with transparency. I know that the vray 2 sided material is really nice for this type of effect but I have only played with it a little bit and I am not that familiar with getting good results with it.

 

edit: I do not see that the chandalier lights are really casting shadows. You may be able to use lights that don't have shadows. I don't know.

[dinhtuan]

I've done a interior animation of small lobbly and time for rendering was 30mins with IES file. But when i changed to other IES everything ok, time decrease to 4-5 mins. If you want to try, this is the good files I used. I'd like IES cause the shadow on wall very nice (bad english-->dont know how to say ) there're no light can make it.

 

Also i'm trying to use LWF in animation too so if you have any experiences pls hepl! They are said that LWF can decrease rendering time because we don't use to much lamp to light the scene but i'm still not success yet.

[Devin Johnston]

Thanks for all the help guy's, I'm going to work on those chandeliers today. I rendered some frames over the weekend at different GI settings and the results I'm getting are not what I expected. These three images show the results of my settings:

 

Low:

IR = Low

HSph.subdivs = 40

Interp. samples = 30

Light Cache:

subdivs: 350

Time to render: 7min

 

Medium:

IR = Medium animation

HSph.subdivs = 40

Interp. samples = 30

Light Cache:

subdivs: 700

Time to render: 23min

 

High:

IR = High animation

HSph.subdivs = 40

Interp. samples = 30

Light Cache:

subdivs: 700

Time to render: 1hr

 

As you can see there is still a lot of noise even at the high settings, and right now the low version looks like it's the best one. I know my settings aren't correct but other than turning them way up I don't really know what to do. Man Vray sure is a lot harder to work with than Maxwell.

[Sawyer]

Have you tried a default grey material? Do you have "use interpelation" for materials checked?

[Devin Johnston]

Sawyer what do you mean use a default grey material, if your talking about during the initial setup when I was first setting up my lighting then yes I did.

 

Where is "use interpelation" located and what does it do?

[Fran]

Devin, some thoughts:

 

1. What are the settings for your white wall material? It looks like it's glowing.

 

2. With those IES lights, try seeing what happens if you use shadow maps instead of vray shadows. Sometimes, shadow maps are faster with that many lights.

 

3. I would also exclude any glass from your chandeliers from generating GI (Vray properties in the quad menu). And for an animation, I would not use frosted glass. Try using a Standard material with opacity set to something like 50 for starters. Any material with refraction is going to slow things waaaayyy down.

 

4. Try HSph.subdivs = 50 and Interp. samples = 20 to get rid of those splotches on the walls.

[Devin Johnston]

The white wall material is 240x3 so it's not totally white but close. You were right about those IES lights shadows’; changing them to shadow maps has really helped. I've excluded the glass from GI and that also helped a little, right now I'm just experimenting with my IR map and Light cache settings.

 

Just so I know what should I be looking for in render times per frame for an animation, is there a sweet spot?

[Sawyer]

There is a check box on the glossy reflection portion of the vray material that says "use interpolation".

If that was checked and you had a really low number for glossy subdivisions (again on the material right below refl glossy) you may have splotches. So what I was wondering is if you have done a new pass with the override material option and you use a clean material if that comes out splotchy as well. There may be no relationship with materials and what is happening but this is an easy way to be sure.