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Topic: Difference between interpolation types
posted by Mike Kennedy / Vlado
archived on 15.5.2002
Is there a real world reason to use the different Interpolation Types?
Why would I used Weighted Average instead of Least Square Fit or Delone Triagulation?
I almost never use Delone, but I was wondering what the advantage of each was. Interior vs Exterior etc.
Mike Kennedy
Follow-ups
A: Well, here are the advantages and disadvantages of the interpolation methods:
The Least squares fit produces the smoothes images; however it may have some problems in areas with different sampling rates (boundaries between more/less densely sampled regions).
The Weighted average solves this problem, but may look a bit blotchy.
Both of the above methods are blurring. While this usually makes things look smoother, it may be unwanted; this is where the Delone interpolation is useful - it does not blur the GI, it only interpolates it. While this usually produces very blotchy results, it may be useful to reduce flickering in animations. Here are some sample images with the three methods (rendered with VRay 1.08.03)
Delone
Least squares fit
Weighted
Best regards,
Vlado
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