9

Camera Match Utility 1389
4.
Enter the coordinates of the first CamPoint
object (0,0,0), click the Create button, and then
enterthenameinthenamefield.
Tip: To use the keyboard, first click in the X field,
enter its va lue, and then press
Tab to mo ve
to the next field and enter its value. Continue
this until you tab to the Create button, and then
press
Enter to create the CamPoint, followed
by
Tab to move back to the X field, where you
can start again. You c an create all the CamPoint
objects with default names, and t hen use the
Select By Name floater ( Tools > Selection
Floater) to select and rename the six pointers.
5. Repeattheabovestepsfortheremaining
CamPoint objects.
Note: An alternative method is to create the
CamPoint objects anywhere in the scene, and
then reselect each of them and enter their
absolute coordinates using the Transform
Type-In.
You now have the CamPoint objects occupying
real-world coordinate positions that correspond
to the structure in the bitmap image. The last
sequence of steps involves using the Camera Match
utility to specif y the screen coordinate points,
one for each CamPoint object, and generating a
camera position based on the data.
To use the Camera Ma tch utility:
1.
On the Utilities pa nel, click the Camera Match
button.
The Camera Match utility appears, listing the
CamPoint objects.
2. Select the first CamPoint object and click the
Assign Position button.
3. Placethecursoroverthecorrespondingfeature
in the bitmap and click.
Asmall,redcrossappears.
4. Ifthedotisnotintherightposition,youcan
either click again with the mouse or adjust the
Input Screen Co ordinates to tweak its position.
5. Select the second object in the list, and repeat
steps 3 and 4.
6. Repeat for a ll the points. By sett ing the red
crosses, you’ve indicated the X and Y pixel
position on the bitmap and correlated it with
each CamPoint as it exists in 3D space.
7. Onceyouhaveallofthepointsset,clickthe
Create Camera button.
A camera is created in the scene based on
the location of the CamPoint objects and the
specifications of the screen coordinates points.
Note: If the Current Camera Error reading is
greater than five, at least one of your screen
coordinate points is placed wrong. Check each
of them, and review the description following
step 5. After reassigning the points, select the
existing camera and click the Modify Camera
button to recalculate the camera position.
8. Press C to switch the Perspect ive view to that
of the new camera.
Interfa ce
CamPoint Info rollout
List window—Displays a list of the CamPoint helper
objects in the scene. You select the CamPoint