Correct the time unit
Be
sure to set your time unit before tracking. If you forget, you can
fix your tracked points by rescaling the times of the keys in the
graph editor.
Choose between two methods to reset the time
scale.
Method
1
- Change
to the desired Time scale in the Settings category
of the Preferences window (
Window > Settings/Preferences > Preferences).
- In
the Track control panel, click
the Select All button.
- In
the channel box, select all fields that appear green (meaning they
are animated values).
- Select
Edit > Keys > Scale Keys > .
- In
the Scale Keys Options dialog,
enter the following settings:
- Channels -
Select From Channel Box
- Time
Range - Select All
- Time
Scale/Pivot - In the Time Scale field,
enter the value obtained when you divide the current frame rate
by the target frame rate. For example, if you want to scale from
24 fps to 30 fps, the value is 0.8. In the Time
Pivot field, leave the value at 0.00.
- After
you have rescaled, run Solve again.
Method
2
- Leaving
the Time unit setting alone, save
the scene, then click Save As to a
Maya ASCII file.
- Open
a new scene to clear the memory.
- In
a text editor, open the ASCII scene file and find the heading "CurrentUnit"
near the top of the file.
- Change
the -t flag to one of the following time units: film, game, ntsc, ntscf,
pal, palf, or show.
Each time unit name represents a certain speed:
film is 24 fps |
pal is 25 fps |
game is 15 fps |
palf is 50 fps |
ntsc is 30 fps |
show is 48 fps |
ntscf is 60 fps |
|
- Save
changes to the ASCII file.
- Reopen
the ASCII scene file in Maya Live.
When you do, the track points and all solutions
are scaled to the new time unit.
Correcting the filmback setting
If
you forget to set the filmback, you can fix your tracked points
by rescaling the values of the keys in the graph editor.
To
adjust track point scaling for a new filmback
- Change
to the desired filmback settings in the Setup control
panel.
- In
the Track control panel, click
the Select All button.
- In
the channel box, select the LocationX attribute.
- Select
Edit > Keys > Scale Keys > .
- In
the Scale Keys Options dialog,
enter the following settings:
- Channels -
Select From Channel Box
- Time
Range - Select All
- Time
Scale/Pivot - In the Time Scale field,
enter 1.0 to keep the time scale as is. Leave Time
Pivot at 0.0.
- Value
Scale/Pivot - In the Value Scale field,
enter the value obtained when you divide the current film aperture
width into the target width. For example, if you want to scale from
1.481 to 1.333 (NTSC video), the value is 0.9. Leave Value
Pivot at 0.00.
- To
see your change in the view panel, refresh the screen.
- After
you have rescaled, run Solve again.