Renumber frames

[TBFX]

Hi JimStar,

I notice the Renumber frames feature in the common tab of the render settings does nothing when batch rendering with Octane. The By frame value above it works but is not much use if the Renumber frames feature doesn't.

If it is possible to implement this it would be really useful for doing multi frame oversampled motion blur while we wait for integrated motion blur to come to the engine.

T.

[p3taoctane]

T
I was not so successful at getting by frame to work...

I was trying to use by frame to essentially render more "in-betweens" rather than using the graph editor to change the timing and then speed it up in post.

Am I on a similar quest as you. Is that what by frame can do?... i.e by frame 0.5 .. is it essentially giving you two rendered images per frame.

I am interested how you are getting motion blur by using this feature as I have to do the same thing.

Where asI I tried renumber and it did work... as I often end up adding negative frame values after I time something and I use renumber to start at 1.

I'll check again and make sure I am not full of it.

Peter

[TBFX]

Am I on a similar quest as you. Is that what by frame can do?... i.e by frame 0.5 .. is it essentially giving you two rendered images per frame.

Yes, that is what By frame should do, and does for me, but without Renumber frames working it will number them as part frames with decimal points and no comp software I know of can read them in sequence.

Where asI I tried renumber and it did work... as I often end up adding negative frame values after I time something and I use renumber to start at 1.

I'll check again and make sure I am not full of it.

Peter

Ah, I think the Start number of the Renumber frames must be working but not the By frame parameter which is what is needed to renumber partial frames correctly.

I am interested how you are getting motion blur by using this feature as I have to do the same thing.

Simple enough. Depending on how fast things are moving you decide/test how many temporal oversamples you will need for smooth motion blur, as an example lets say 10 (which will work pretty well unless you have very fast motion) So you render with By frame = 0.1 and renumber with the Renumber frames By frame set to 1 and you get 10 times as many frames of the animation which you then time remap in a compositing package back to it's original length with a blend frames method which effectively averages all the extra frames and Viola motion blur.
Of course it's a little more complicated than that if you want to be correct because there should always be a shutter closed period between frames where there is no blur so you actually only want to average half of the extra frames (some comp software will allow you to do this within the time remap quite easily) The problem being then that you would only get 5 temporal samples in the above example and would probably see banding in the motion blur. This would mean rendering at by frame 0.05 or 20 times the number of frames to get a 10 frame blend.

This sounds horrendous for render times but it's actually not that bad with an unbiased renderer like Octane as you can generally drop the Max samples by the same factor because when you average all the frames together you get roughly the same result noise wise. So if max samples of 1000 gets you an acceptable render on a still frame and you are going to aveage 10 frames for each final frame you can drop the max samples to 100 for the sequence render.

Hope that all makes sense. It seems to work pretty well from the tests I've done but I haven't done any complex scenes yet as it's a pain without the Renumber frames working correctly.

T.

[JimStar]

Hi JimStar,

I notice the Renumber frames feature in the common tab of the render settings does nothing when batch rendering with Octane. The By frame value above it works but is not much use if the Renumber frames feature doesn't.

If it is possible to implement this it would be really useful for doing multi frame oversampled motion blur while we wait for integrated motion blur to come to the engine.

T.

I will think about it, thanks for pointing.

[p3taoctane]

Thanks T
That sounds exactly what I need. I'll give it a whirl when JimStar gets that taken care of.

Peter