Another idea: editable post-processing effects 2004-01-22 - By nospam2
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Bonjour joe_ashear,
Thursday, January 22, 2004, 1:13:16 PM, you wrote:
j> One other idea for Eovia: why not make post-processing effects like
j> glows and lens flares editable after the rendering is complete? If I
j> have an effect that came out wrong, it it would be great to be able to
j> just remove it or re-apply it with different settings, without having
j> to re-render everything. Wouldn't it even be possible to add new
j> effects after a rendering is complete? For example, if my rendering
j> contains a distance G-Buffer, couldn't I add depth cueing after the
j> rendering is done? I realize I could do it in Photoshop, but I'm
j> talking about taking advantage of Carrara's own capabilities.
The problem with post-processing effects is already well known : sinc ethe
final image generally doesn't includes the necessary data, the effect is not
very good compared to effects that can e computed at the rendering time.
An exemplary case is the depth of field.
I was very disappointed on that matter when C3 arrived and I could test it.
The problem is the following :
- if the focus is on the front objects, and the blur on the background, there
is no special difficulty.
- but if the foreground is blured and the focus in the background there is a
problem of so-called "missing information".
To accurately calculate the DOP effect, you need information about objects
hidden by the foreground objects.
If you do a post-rendering DOP, that is if you calculate it from a 2D image,
you can never acheive a correct effect in this case because you cannot extract
from a 2D image information about objects hidden by foreground objects.
The only solution is to compute the DOP t the rendering time, when all the
scene data are available.
Unfortunately, the C3 DOP, being some kind of post-rendering effect, still
fails in using hidden data and thus fail in producing correct DOP.
I even found that Photoshop plug-ins produce a better effect than C3 on this
regard, which is very bad since C3 is in a much better position to acheive a
correct DOP.
j> And of course this would be even more beneficial in animations. If a
j> glow is too overbearing, you could adjust it in all of 200 frames
j> without having to re-render. Aaaahhhh. Nice.
j> - Joe
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--
Best regards,
nospam2 mailto:nospam2@(protected)
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