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Creating additional Plane constraints
Lesson 2: Solving with survey data
Beyond the lesson
Evaluating the solution with imported geometry
The best evaluation of your solution is to set
an object in front of the solved camera and see if it matches the
background as you play the animation. In this case, we will import
a fence modeled in Maya.
Before you load the modeled fence, do the
following steps to add one more survey constraint. You add a Point
constraint to orient the solution so fenceCorner is at the origin.
You need fenceCorner at the origin because the fence model has its
corner at the origin and you want the two to match exactly.
To
reorient the solution with fenceCorner at the origin
- Switch
to the Survey settings.
- Choose Points from
the Constraint Type menu.
- Select
the following track point in the Outliner under clip1TrackedPointVisibilityGroup
> clip1TrackedPointGroup:
- Click Create.
Maya creates a Point constraint in your scene, located at the origin
(0,0,0) by default.
- Switch
to the Solve control panel, select
registered1 from the solution list, and click the Register button.
The solver creates registered2 with fenceCorner at the origin.
You will now import a fence that has been modeled
to exactly match the fence that was filmed.
To
import a modeled fence
- Choose
File > Import.
- Navigate
to the MayaLiveLessonData/scenes directory
in the Import browse window.
- Double-click fenceModel.ma to import it.
To
evaluate the solution
- Hide
the Plane constraints by selecting them and choosing
Display > Hide, Show.>
Hide Selection By hiding them, you can see the fence better.
- Enlarge
the shotCamera view panel, which is in the upper right of the Solve panel
layout. This panel shows the view from the solved Maya camera.
In frame 1, you can see that the modeled fence
accurately matches the fence that was filmed. To quickly see if
it matches well in the other frames, you can scrub through the shot
in the Time Slider.
- To
scrub through the shot, drag slowly from left to right in the Time
Slider.
The fence model does not appear to slip in relation
to the background, so this confirms that the solution is accurate.
If you rendered a sequence of the camera moving around the modeled
fence, you could composite the sequence with the original background
and they would exactly match.
Although scrubbing tends to skip frames, it
gives a preliminary confirmation that the fence model matches the
background in all frames.
- To
evaluate the solution in a more accurate playback, select
Window > Playblast.
The Playblast movie
is an approximation of how the rendered sequence will appear. In
this movie, you can look for subtle mismatches between the model
and the background, such as momentary jitter.
NoteAs an alternative
to the Playblast, you could play the
animation in Maya, provided you allocate enough memory in the Setup
Cache control panel. If you have memory allocated for
all 240 frames, the playback will be as fast and accurate as the Playblast movie.
When using Playblast, you’ll need approximately
20 Mbytes of free space in your computer’s temporary directory.