Post
by Svengali » 13 Feb 2018, 01:49
I think the two concepts are fundamentally different.
Bezier handles are vector based and work with curve values which can be interpolated. The WARP concept works with a grid which subdivides the pixel field, then redraws/interpolates the pixel content of each cell in the grid to deform the original pixel image. Each time the new deformation is redrawn and stamped, the deformed grid is thrown away and a new, "re-squared" grid is drawn over the deformed pixels of the previous result. Since the grid starts freshly "re-squared" after each deformation, progressive, multi-frame interpolation isn't part of the WARP concept. Also, there is a cumulative degradation/softening of the original image over subsequent frames (like a xerox of a xerox of a xerox...)
...except in the case where the deformation reuses the same source image from the library. In that case the deformation is persistent over multiple frames AND always deforms the original library source image, so the xerox of a xerox degradation doesn't occur. Still, there is no interpolation of this "clean", progressive deformation available, since each new frame must be "deformed by hand".
I guess the concepts really are fundamentally different.
For now, the WARP concept in TVPaint is only a partially realized tool, but deformational interpolation of the grid over multiple frames might be a future capability (for many WARP users, the lack of multi-frame interpolation is the most significant shortcoming.)
One thing I'd like to see is the ability to store a "home grid" and a set of control points as part of the library source image, so you could easily deform the same source image in different sequences. Theoretically, this could provide a way to truly interpolated, sequential, multi-frame deformations as well.
I'd be interested to hear if any TVPaint users regularly use the current WARP tool in their work flow, and how?
Sven
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