schickb wrote:
> Ofnuts <o.f.n.u....@[EMAIL PROTECTED]
> wrote:
>>> I'm looking for a way to explode an image around a central point.
>>> During the "explosion" the central point wouldn't move and the further
>>> a pixel was from the central point, the further is should move away
>>> from that point during the explosion.
>> The displacement map with a radial gradient as a map?
>>
>
> Sounds possible, but so far I haven't gotten that to do what I
> described.
Map layer: use radial with black at center. Make it "wide" (ie, end of
line near a corner).
When applying displace map: use polar mode, pinch only, with a fairly
high negative pinch (1/4 of you image width, for instance). I used -200
on a 800x600 image.
Potential improvements:
- if you apply your first map twice, you end up with a "squared" effect
which may be more dramatic. And even more so if you reapply the map
several times.
- Although it will be harder to generate(*), a star-shaped displacement
map may look more realistic.
- maybe your "explosion" requires more than a displacement.... You may
want to add some displacement jitter (use some random drawing as a
further displacement map) or add some noise to the original map.
Also, if you apply your first map twice, you end up with a "squared"
effect which may be more dramatic.
(*) maybe a plain B&W star with heavy-handed blur...
--
Bertrand
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