Motion Blur

[kavorka]

I am doing a turntable animation with motion blur enabled. I was wondering if there is a setting to change the amount of blur, or is it dependent on the speed in which the camera is moving?

[FooZe]

Hi kavorka,

No, there is no setting for motion blur amount. And yeah, it depends on the speed of the camera since it interpolates between 2 frames.

Cheers
Chris.

[kavorka]

I figured as much. Maybe an option to fine tune the amount at a later date could be added. As an artist, sometimes moving a little away from "realistic" will give you the look you are looking for. For my project, its a small watch and I'm doing a 360 degree turntable that will only last 4 sec. I want the watch in focus, but just a little motion blur might add a nice effect. The amount it currently has is way too much for a product display.
I assume I could do a longer animation and then compress it, that might lessen the motion blur, or move my camera away and then just crop it in post production (these are just theories), but both of these would add too much render time. I am going with no motion blur, and I think it looks fine without it.

On a side note, glad to see the new Octane team member helping out in the forums

[kavorka]

I was just looking at the dialogue box for the turntable animation. does the start offset change the degree that it starts at, or fram # it starts at?
Basically, I want to be able to start my render, stop at a certain frame, then continue from that frame at a later time. Since I'm rendering out to .pngs, it doesnt matter when I render them.

If that's not possible right now, I think it would be a big improvement to the turntable animation process. Especially if you are busy on your comp during the day and just render at night while you sleep (like me)

[Reggie]

Yea, a lot of standard convenience features are currently missing from Octane, like multipliers (of all sorts). But a post-blur adjustment would require a 2D blur system, which I'm not a big fan of. Hell, that would even require that stores velocity information in a file, which is another feature (render passes) that is currently no where to be found.

[FooZe]

Hi kavorka,

The offset is in degrees. With the current settings you CAN get it to stop and start when you want by figuring out the degrees per frame considering your total frame number for a 360 revolution.
EG: 360deg in 200 frames over 8 seconds
360/200 = 1.8deg/frame

4 chunks can be done like this:
degrees = 360/4 = 90
duration = 8/4 = 2
frames = 200/4 = 50

Start offsets = 0, 91.8, -178.2, -88.2
(note if you have offsets of 0,90,180,-90 then you will get double ups of frames at the end of one segment and the start of the other)

However, it's somewhat less than intuitive (to say the least!) and you need to enter a new name for the pngs for each segment or the old ones will be overwritten, which probably means more post proc to rename all the pngs into sequence again. As you say - if there was an offset frame # that would make things a lot simpler! png's would be auto named in sequence and you could easily resume without figuring out the deg. per frame etc

Thanks for the feedback on that.

Cheers
Chris.

[Proupin]

you can cut the motion blur in half by rendering every 2 frames, if your software's exporter has this option (3dsmax's does have it, is all I know). Let's say you want 300 frames for a full revolution, set it at 600 and render every 2 frames. Then rename with Bulk Rename Utility

[MTECH]

I currently do the "1/2" method of rendering every other frame and re-naming the sequence, but it seems to yield slightly less blur than a typical 24p camera set to 1/48 shutter would.

Simply blurring about 2/3 as much as you're currently doing would probably solve this problem very well (until a fully featured camera AND object motion blur system can be implemented, of course!). Is that a relatively easy thing to adjust in for a future build?

[rappet]

Hi kavorka,

The offset is in degrees. With the current settings you CAN get it to stop and start when you want by figuring out the degrees per frame considering your total frame number for a 360 revolution.
EG: 360deg in 200 frames over 8 seconds
360/200 = 1.8deg/frame

4 chunks can be done like this:
degrees = 360/4 = 90
duration = 8/4 = 2
frames = 200/4 = 50

Start offsets = 0, 91.8, -178.2, -88.2
(note if you have offsets of 0,90,180,-90 then you will get double ups of frames at the end of one segment and the start of the other)

However, it's somewhat less than intuitive (to say the least!) and you need to enter a new name for the pngs for each segment or the old ones will be overwritten, which probably means more post proc to rename all the pngs into sequence again. As you say - if there was an offset frame # that would make things a lot simpler! png's would be auto named in sequence and you could easily resume without figuring out the deg. per frame etc

Thanks for the feedback on that.

Cheers
Chris.

That is great Fooze... I was looking for a solution to render partials of the turntable.
Thanx for pointing out how-to

It would be much easier though when also having the ability to select a set of frames.
Suppose I just had to stop rendering at a random point (i.e. at frame 1217/3600);
I would like to restart another time the turntable to render from 1218 without doing a lot of math (which is good for braintraining )

Would in this example (I chose easy example with 3600 total frames) be the current way to do the restart:
calculating the degrees that are rendered: 1217/(3600/360)
Start Offset at 121.7 (because then in fact it is not too difficult after all )

greetings, Jeroen