[Bf-committers] Blurred Edge for Sweep Effect

[Matt Ebb]

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On 26 Jun 2004, at 2:58 PM, Johnny Matthews wrote:

> Here is the latest movie from my work with the new sweep code
>
> http://www.gvc.net/~jmatthews/blender/sequence/sweeps_2.mov

Looks pretty cool so far!

> Feedback Please!!

I've found that in your example video, some of the soft-edged wipes are 
'jumpy' - they seem to appear part way across the screen at the start 
of the transition, instead of smoothly fading in from the side. Better 
than this verbal explanation is a picture:

http://mke3.net/blender/etc/wipe_soft_jumpy.jpg

Frame T is the start frame of the transition. In T, T+1, T+2, the 
distance travelled by the blurred part is relatively small - the inner 
edge of the blur travels by only a few pixels each frame. However from 
T-1 to T, the there's a large distance between the edge of the frame 
(T-1) and the edge of the blur (T), which makes it seem to jump out 
from the side at the start of the transition. Ideally, the edge of the 
blurred area should begin at the edge of the frame, and smoothly travel 
across from that position.

As has been mentioned on the forums, I also recommend calling it 'Wipe' 
rather than 'Sweep', as Wipe has been the industry standard term for 
this for decades.

Cheers,

Matt
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