shift in animation, one scene different cameras

[t3dm]

Hi All,

Ok.. a simple scene, part of a large animation flythrough.. we have 6+ cameras in the scene moving in complex motions throughout the building.. in 720p output.

attached is a screen grab of our problem.. we have camera 1, which flys through the door and pauses.. 0-150 frames, then camera 2 moves to the left and up from frames 150 onwards.. when we compare the 2 frames you get the obvious shift in luminance and more noise and flashes of light. We are using light cache flyththrough mode and multi frame incremental for cam 1, the same for cam 2 but are then incrementally adding to the irradiance map (we get the same error using multi frame incremental too)

I could expect a slight change in the GI noise, but not in the over all levels of the images..

any work arounds (other that Brute force.. as it would take too long..)

regards..

[t3dm]

any ideas anyone??? the change in GI (ie some light flashes is weird too)

[olly]

If you render a test frame for each camera and set IR & LC to "single frame" do you have the same issue?

[t3dm]

nope.... its fine! ????

[olly]

Sounds like it's an issue with adding to the ir map in memory. Might be worth trying a cam that incorporates both of your initial camera paths, render and save out the GI and call the maps from your two initial cameras....

[Neilg]

you need to make both those cameras one long path for the sake of the ir/lc. You only need to do this for the lc, the ir you can merge together afterwards.

[t3dm]

Thanks.. so we have to merge all the camera movements.. eek.. thats some chore.. I might just try adjusting in post for this project.. its good to know this now as we will have to take this into account when setting up another animation like this in future..

thanks for all your help..

I take it merging the irr maps would be done using the irr map viewer?

[olly]

Certainly is.