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1251

Camera Match Helper 1235

Cr e at e Cam e ra—

Creates a camera in the scene

whose position, orientation, and field of view is

basedonthecurrentlocationoftheCamPoint

helpers and the assigned screen coordinate points.

Modify Camera—Modifies the position, or ientation

and FOV of an existing, selected camera based

on the CamPoint helpers and assigned screen

coordinate points.

Iterations—Maximum number of iterations used

to calculate the camera posit ion. Default is 500,

thoughastablesolutionisusuallyfoundinless

than 100 iterations.

Freeze FOV—Prevents the FOV (field of view) of

the camera from being changed when using the

Create Camera or Modify Camera buttons. Use if

the F OV of the camera that took the photograph is

known and you want to preserve it.

Current Camera Error—Displays the total error that

remains between the placed screen coordinate

points, the CamPoint helpers, and the camera

position after the final computation. The

calculations involved in the camera match are

seldom perfect. A goo d error range is about 0 to

1.5.

Clo se —Exits the Camera Match utility.

Cam era Match Help er

Obj ect s

Cam era Match Helper

Create panel > Helpers > Camera Match (from drop-down

list)

Create menu > Helpers > Camera Point

Camera Match helper objects (CamPoints) are

used by the Camera Match utility to reproduce

in a camera the same settings (position, roll,

and FOV) that were used by a real-world

camera to shoot a background image. This

allows you to view your scene from the same

perspective as the background image, which is

a key step to mixing computer-generated and

photographically-generated images in a single

composited shot.

Camerapointobjectsareplacedinthesceneat

locations that will be visible in the background

photograph. By comparing the X/Y/Z position of

several camera point objects to their analogous

positionsinabackgroundimage,theCamera

Match utility is able to determine the real-world

camera’s sett ings, and use t hese settings to either

create a new camera or move/reset an exist ing

camera to match them.

Theplacementanduseofthesecamerapointsis

described in the Camera Match tutorial.

Choose C ameraMatch from the Object set list to

see t he

CamPoint (page 2–1236)

object type.