#Perspective – HELP
3 messages in this thread
Perspective does NOT maintain FOV while moving along a path as told on pages
7-178 & 8-87 in reference manual (Release 4). I have tried adjusting bias,
cont, tens, etc… NO SUCCESS. to duplicate, create a cube, place a camera (any
Lens and FOV), in keyframer, slide to frame 30. Use Camera / Perspective to
"move" camera away from cube. Frame 0 looks OK, Frame 30 Looks OK (just less
object
vanishing). My FOV gets larger (to its largest @ frame 15 or 16) then smaller
towards frame 30 (where it becomes the same FOV as frame 0). I have talked to
many users about this problem. Is there a bug? Is there a Fix? Or am I missing
something very basic? Thanks for any input to this dilemma.
Barry Swift
Graphics Unlimited Inc.
74562,1362
> Use Camera / Perspective to "move" camera away from cube <
Typically, the camera's degree of perspective, which is determined by the FOV,
will remain constant throughout the whole animation, since real-life cameras
(and our eyes) do not change perspective over time.
To "Move" the camera away from an object, use Camera/Dolly, which pushes or
pulls the camera towards or away from it's target.
— James — Choreo Motion —
>> Perspective does NOT maintain FOV <<
The perspective control actually manipulates 2 settings for your camera. One
setting is the "Dolly" or the position away from your object, and the other is
the FOV. The purpose of the control is to keep your scene size the same, but
alter the perspective created by the lens/distance combination.
In theory, what you did in your animation should create something like the
Hitchcock Vertigo effect (the famous staircase shot) where objects in the
scene will appear to either spread apart or move together while the overall
extents of your frame remain the same overall size. The problem you are having
sounds like it's related to the bias/continuity settings for your keys. Try
setting the continuity to 0 at both frames 0 and 30 AND for both camera
adjustments POSITION and FOV.
I'll try it here when I have a moment.
– Dave