Irridance Map - Stills Vs Animation

[JamesTaylor]

Here are 2 frames of the same scene. It is the very 1st frame of an animated sequence.

 

I have been test rendering the scene as still images, with the irridance map set to single frame, and was happy with the image quality so sent the sequence to render precalculating the Irridance map using Multiframe Incremental, all other settings - Hsph SubDivs / Interp Samples etc. didn't change.

 

As you can see from the 2 frames the resulting image quality differs quite drastically. The image rendered as a still is reasonably smooth (shadow areas) yet the same frame rendered via the Precalulated Irridance Map is very splothy in the shadow areas??

 

I would have expected the frames to come out the same irrelevent of which method was used?

 

Can anyone explain?? Why the difference?

[CRD]

what are your secondary bounces set to?

 

If you are using Lightcache, then you'll need to set the mode to Flythru and increase the samples so that there are enough to be spread out through the length of the animation. Something like 3000 samples per 1000 frames on the low end.

 

Or you can switch to DMC and have slower renders + more noise, but less splotches.

[landrvr1]

In the preCalc, are you calculating every frame, or what's your nTH frame set at?

[JamesTaylor]

Hi Guys,

 

looks as if i've got this figured now, just been waiting for the sequences to come back from the farm, but thanks for the interest.

 

FYI the 2nd bounces were DMC and originally the nth frame was set at 5

 

It appears that my problem was coming from having a slightly too low HSph value that when just calculated for the single frame was able to be smoothed out by the interp value, however that slightly messy irr map was becoming increasingly messy when compiled with the others from every 5th frame and so exagerating the problem.

 

Increasing my HSph value and drastically reducing the no. of Nth frames to be calced has solved the issue.