I have a simple animation of a vray physical camera which moves from pointA to pointB while it looks at a building. As the animation proceeds, you can see through a glass door a workbench which is in the garage.
I can see a lot of difference in the shading of the workbench between frames. This shows as a kind of flickering as you see the differences between frames. Here are 3 frames… f135, f136, f137.
It’s a bit hard to tell, but the workbench behind the glass door is different in each frame… which results in the flickering.
Is there a particular render setting that would make the rendering of the inside of the garage more consistent?
Irradiance map by it’s nature is super fast, But not accurate and would change from one frame to another randomly.
To avoid flickering you will need to “Cache” the GI calculations into one file and load that for the entire animation so it is static.
If you are not familiar with caching process take a look at the official documentation tutorials section. It might look long process, but once you get it you will find it so easy to do.
As for the floor issue, are you sure there is no overlapping faces there (vray plane at the same level)
Yep - as max said above, irmap is inherently slightly different at each frame so the flicker is built into it - there’s a few situations where you might get away with this (animated character moving around outside for example) but for a static scene with a moving camera, having the solution change every single frame will kill you. To stop flicker, you calculate enough frames so that the camera has seen every possible visible part of your shot and then you lock / cache this solution. It gets you a beautiful combination of quality and speed that aren’t possible any other way and the irmap is designed to fulfill exactly this task. I don’t think you’ll ever find a combination of settings that’ll give you flicker free results that aren’t so extremely high that you wouldn’t have done better with brute force as your primary GI.
I’m using baked / cache irmap and light cache on a huge vfx film right now and have done on many other huge vfx films and it’s not because I can’t find the settings to make it not flicker, it’s just that it wasn’t designed to work per frame on architectural jobs anyway.
Don’t bang your head off the wall for zero benefit, give this section of the docs a quick read and you’ll laugh at how much easier your life will become! Chaos Docs
(doesn’t matter that it’s vray 3, it hasn’t changed since 2)
Thank you very much for these ideas and explanations! I will dig into this info further. I will check the geometry again but I’m pretty sure my models are clean.
