[tom]

I found changing FPS doesn't affect motion blur.
Since it depends on shutterspeed, 1 sec must be equal to N frames...
Can someone make it clear at what FPS motion blur is working properly?

[hdesbois]

Just thinking, at least in Lightwave, FSP does not (though I'm not entirely sure) affect motion blur. You control it only by changing shutter angle (equivalent of shutter speed for movie camera). Even if it doesn't sound logical, you can have a shutter speed less than 1/24th of a second at 24 fsp, meaning more than 100% motion blur or impossible shutter angles (standard is 170°, meaning 1/50 second exposure with exposure=360*FSP/shutter angle). Not realistic but convenient. Maybe it's better if it stays this way with Maxwell, unless we are really confident that there is no drawback linked to high speed films (there was an unconclusive thread about that lately).
HD

[tom]

No no... it's all right... I say something different.
Let's ask it in an other way:
We determine the Shutterspeed in shuts-per-sec
So how much is 1 sec in our 3D package in terms of frames?

[hdesbois]

Ah, sorry, I did not understand. I can speak only for Lighwave here, but FSP is one of the global settings of the scene. I expect Maxwell reading this along with sutter speed which is not dependant from it. Not the same with other packages? Or maybe I'm still missing something here?
HD

[Hervé]

don't know in Maxwell... but in LW, we usually set it in the prefs.

I would guess 25 frames/sec. coz NL is located in a Pal country..

LW was by default set on 30 f/sec., I guess because Newtek is US based... no?

... unless, thet were for the big screen international 24 frames /sec.

@+

[tom]

the problem is maxwell is not getting the timebase from the max or lw...
i mean when i set the scene 25 fps or 30 fps, motion blur must be affected... but it's not...
so what's the default correspondance of 1 sec for maxwell? Albert can give an answer easily I know...

[tom]

oh god kill me... nobody understand me....
so how many frames are 1 sec for max then?

[tom]

i know 8etty but the point is maxwell is not affected by the scene's fps setting at 3dsmax

[tom]

so you say there's no way to adjust shutter like in video camera...and so the motion blur... this is not really satisfying then at least we must have an option to set shutter speed more then 1/1... i mean open shutter... think about moving car lights...

[tom]

Let's make it clear:

- Imagine I have a 25 frame scene at 25 fps, this will play 1 sec you know.
- Imagine I set a location keyframe at the first and the last frame for an object moving 1 meter distance.
- Imagine my maxwell camera shutter speed is 1/1 (1 per sec).

This must be causing full motion blur from start to end!

Furthermore, if I change animation settings from 25 fps to 50 fps without resizing the keyframes
with keeping the shutterspeed intact, the resulting motion blur must be affected due to change of animaton timebase.

[tom]

Yeah I think Albert will see this and I hope he'll understand what I'm trying to say... Because the actual motion blur is very useless, at least in terms of subframes. You cannot handle fast moving things.

[tom]

i'm not just thinking car lights but other things that are very amazing to have with this kind of shutter speed and motion blur... i hope more subframes will overcome this situation. however it must still be working in juction with the scene's fps setting to have proper results.

[tom]

oh carmen I know this but you think in a traditional way
think about the 3d application.... you DO NOT have to RESIZE your keyframes while changing it from 25 to 30.
Please think about this, when you don't check "resize animation" the time of the motion changes.
Could I tell it now

[tom]

so yes there it affects motion blur

yeah i'm trying to shout out this.... maxwell motion blur must take care of fps setting... this is a must.

[albertMaxwell]

Due to the difficulty to integrate Motion Blur with all kind of light interaction this first version of Motion Blur of objects support only 2 steps per frame. Another limitation is that the diaphragm can not be opened more time than 1 frame. So the shutter time must be below 1 / fps.
This last limitation is due to 2 steps is not enough to display, for example, 30 frames with precision.

maxwell is not affected by the scene's fps setting at 3dsmax

We test it to see if it is a bug.



Albert.