[Bf-committers] Jumping camera

[Ton Roosendaal]

Hi,

What you describe is the limitation of a system using tracking with an  
enforced 'up' vector. There's exactly one situation where it doesn't  
work (look straight up or straight down), just avoid that...

-Ton-

On Wednesday, Jan 21, 2004, at 06:39 Europe/Amsterdam, Meino Christian  
Cramer wrote:

> Hi,
>
>  another one:
>
>  start with the default scene, but delete the plane
>
>  Position an assymetric object of your choice at 0,0,0
>  -- the objects _needs_ to by assymetric, otherwise the effect
> 	is hardly to recognize
>
>  Position light as needed to see enough in the dark ;
>
>  Position a camera above the object at 0,0,<some distance>
>
>  Position  a Nurbs Circle at 0,0,0 with a radius of <some distance>
>  (see above). The plane spread by the circle should be parallel
>  to the plane of the x,z coordinates.
>
>  Make a CurvePath from the Circle and activate CurveFollow.
>
>  Make the CurvePath parent of the camera.
>
>  Clear Origin of the camera (the camera should directly sit on
>  Path)
>
>  Position an Empty at 0,0,0
>
>  Select Camera then Empty and CTRL-T (Make Track) and choose
>  "Constraint".
>
>  Animate the camera view (no rendering needs -- it shows the same
>  effect by consuming more time to get prepared ;)
>
>  Every time the camera is passing "0" in one of the axis, the
>  Up-vector of the camera flips. The animation jumps from one view to
>  another one.
>
>
>  (By the way: Would be nice, if CurvePaths get not be pre-rendered
>  when activating SolidView in 3DView -- a preview of an animation with
>  "solid shaded" object as above can get unusable, when more the one
>  CurvePath is in the scene)
>
>  (By the way (2): When activating Animation with ALT-A it takes some
>  time before the Animation starts...older Blenders were faster with
>  this decision...)
>
>  Kind regards!
>  Meino (mcc)
>
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>
------------------------------------------------------------------------ 
--
Ton Roosendaal  Blender Foundation ton@blender.org  
http://www.blender.org