Some stills are brighter than others??

[aflack]

I am rendering an animation using vray over a network using Backburner. Some of the machines render one of the textures slighty brighter than the others also some of the machines render the glass slighter brighter.

 

Is there any reason for this and is there a way to stop it?

 

Thanks for your time and help.

[JamesTaylor]

sound like you haven't pre calculated your irridance map, you need to do this first on single machine, then make it available to each render node.

[aflack]

There are objects moving in the scene all the time so I can't use the Irradiance Map method can I? I thought I had to calculate a new solution for each frame.

[JamesTaylor]

Correct if there are moving objects a new irridance will have to be calculated for each frame. Unfortuantely i think you will have to render the entire job on a single machine inorder to keep a constant irridance calculation.

 

Perhaps you could set individual machines rendering different chunks e.g frames 0-200 then 201-400 etc. you need to overlap by a number of frames, maybe 30 or so, and then blend between the chunks in postproduction software like AE. This will allow you to hide the slight change in colours.

 

I think there might be a tutorial for rendering an animation with moving objects in, on the vray site, but it may only be suitable slight movement. have a look.

 

James

[aflack]

Its alright I have sorted it, it was because I had two different versions of Vray on the machines through out the office.

 

Thanks anyway.

 

Another quick question when doing an animation I have animated a camera going between A and B, when I set it off the camera slowly accellerates and the slows down as it reaches the final point, is there a way I can make it so it goes a constant speed the whole time.

 

Thanks.

[JamesTaylor]

I'd run a small test before sending the whole job. i've rendered out an animation before where only the camera moved, but each machine calculated its own irridance map for each frame.

 

the result was flickering between frames, so i'd have thought it'd be they same with animatied objects as well.

 

would be nice to be proved wrong tho!

 

Cheers James

[gfa2]

Another quick question when doing an animation I have animated a camera going between A and B, when I set it off the camera slowly accellerates and the slows down as it reaches the final point, is there a way I can make it so it goes a constant speed the whole time.

 

Try going into the curve editor and change the tangent type for the first and last x, y, and z points of the camera from auto to linear. That should make it take right off instead of easing into the motion.

[aflack]

Thats brilliant, thanks.