Vray LightCache

[cjlopez4]

One of my scnenes is taking the light cache to calculate at 24 hours at 3300, 8", 12 flythru mode? I even tried re-assembling the scene but it still taking 24 hours. All my other scenes with the same amount of polys is only taking 1-2 hours max. Any ideas?

__________________

Matthew 1:23

 

Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.

 

Cesar Lopez

[Horhe]

Have you got displacement in that scene?

[cjlopez4]

Have you got displacement in that scene?

 

No displacement, The scene has 3 mil poly's

[cjlopez4]

My foilage in the scene are proxies

[Brian Smith]

if you're in a real crunch, try excluding the 2nd bounce completely, and using LWF to offset the loss in illumination. if you dont understand LWF, try rendering to the vray frame buffer and using the sRGB switch in the bottom of the buffer and playing with the corrections control. this isnt ideal, but in many cases can get you very close to the same result. your irmap will take longer to calculate since it cant benefit from the LC, but the overall savings in time should be significant. this is not the ideal approach but is a quick and handy fix.

[cjlopez4]

Good suggestion, I will give it a try Brian, thanks.

[cjlopez4]

I'm going to precalc IR under "animation prepass" mode and for final run "animation render" and Brute force for secondary when running on the farm. I went from infinity render times to under 15 minutes.

[Brian Smith]

then make sure you had enough RAM when you were rendering with LC. The LC will gobble up RAM and the Brute Force consumes a tiny bit because it's loaded and unloaded dynamically (ie piecemeal). if you didn't have enough RAM, you're processor might have been waiting too much.

[mhmd19732008]

hi

try tweak ram usage (400MB default) and make geometry dynamic in system panel in vray render, for LC make number of passes as the same as the number of your processors.

[cjlopez4]

hi

try tweak ram usage (400MB default) and make geometry dynamic in system panel in vray render, for LC make number of passes as the same as the number of your processors.

 

I tweak ram depending on how much the vray info box tells me it's using, then I usually set a bit higher. I have the settings you mentioned.

[cjlopez4]

Have an issue with the rendering farm. I produced two animations with the same parameters for each, same vray IRR settings, same LC settings, camera's same etc...Max Gamma settings set same. However, one renders correctly with gamma and the other renders with incorrect gamma....hmmm

[mhmd19732008]

hello

i had the same problem one day, the problem is in geometry, especially imported from other programs, e.g. AutoCAD, use stlcheck modifier to test some geometry, or convert the main parts of scene to editable poly or proxies, i used this method and it works, to some degree.

if you are working on exterior animation in sunny environment, dont use light cache, try None for 2nd bounces, manipulate color mapping to adjust exposure of scene.

[cjlopez4]

hello

i had the same problem one day, the problem is in geometry, especially imported from other programs, e.g. AutoCAD, use stlcheck modifier to test some geometry, or convert the main parts of scene to editable poly or proxies, i used this method and it works, to some degree.

if you are working on exterior animation in sunny environment, dont use light cache, try None for 2nd bounces, manipulate color mapping to adjust exposure of scene.

 

Do you like to use Irradiance Map or Brute Force for exteriors? I have yet to use brute force for fears of major flicker in the animation.

[cloakfiend]

Not sure this may help, but theres a plugin for 3dsmax called SOLIDROCKS, and it used the light cache to render. Its a sweet little plugin that does everything in only one or two clicks, and you can see how it adjusts the setting in vray when you use it. It may not apply but its well worth checking out and its cheap too.

 

I use it for everything now. Simply select your desired quality and click render, thats it!! cant get much better.

 

Google it!, i'm not able to post links here yet.

[mhmd19732008]

hi

-irradiance map seems to me the best.

-flickering mainly (as i think) is due to the count of animated objects and cameras in the same time, so:

-try focussing on either fixed cam with multi animated objects, in this case IR is very suitable, since IR calculated according from light to eye (camera), or:

-use LC for 2nd bounce if you need to animate camera, but look to minimize animated objects as possible.

i think your problem with LC in your 1st post is due to both animated objects and cameras