Still frame from a bezier sketch animation. I find the sketch images generate during the interpolated tween times (between 2 keyframes rather than directly at a specific keyframe) to be visually more compelling. The resulting sketch is of a virtual morphed face rather than a specific facial image.
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I used Recycle Normalize to make all of the individual bezier sketch keyframes have the same number of paths. This is important when building an animation. You can Recycle normalize of Split normalize. Split splits long paths into 2, Recycle duplicates paths. The Recycle path duplication leads to a visually thicker sketch as the individual paths move once they leave the keyframe time and are in some intermediate frame time between 2 keyframes.
I find these intermediate sketches to be visually more compelling. So you can view the entire animation process as an approach to building 2D sketch output if you want to. It's an example of how having access to animation and movie processing features can be useful even for artists who are not directly interested in generating animations of video output.
John, it might be interesting then to figure out what is more interesting and see if you could give us a sketch algorithm that did this type of sketch directly.
Well, some of it you could probably achieve via some clever path randomization programming for the paint synthesizer preset. So that could be done to give you the line spread and additional thickness of the overall feel of the sketch. Maybe that would be enough.
But there's also something going on associated with the fact that you are actually sketching a morph of 2 different sets of facial image features. So that part is not really a part of some sketch paint algorithm that could be directly programed into a paint preset. You might be able to emulate some of that via path randomization, but you can see characteristics of both source images in the intermediate tweened sketches that i don't think you could readily program into a paint preset.
I was thinking about a way to derive a caricatured sketch to use for movie processing that would morph tween the sketch of the source frames off of a standard model. So you extrapolate the bezier interpolation. So maybe that's a way to do it? If i figure that out more and can get it to work i'll post a few examples.
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I used Recycle Normalize to make all of the individual bezier sketch keyframes have the same number of paths. This is important when building an animation. You can Recycle normalize of Split normalize. Split splits long paths into 2, Recycle duplicates paths. The Recycle path duplication leads to a visually thicker sketch as the individual paths move once they leave the keyframe time and are in some intermediate frame time between 2 keyframes.
I find these intermediate sketches to be visually more compelling. So you can view the entire animation process as an approach to building 2D sketch output if you want to. It's an example of how having access to animation and movie processing features can be useful even for artists who are not directly interested in generating animations of video output.
But there's also something going on associated with the fact that you are actually sketching a morph of 2 different sets of facial image features. So that part is not really a part of some sketch paint algorithm that could be directly programed into a paint preset. You might be able to emulate some of that via path randomization, but you can see characteristics of both source images in the intermediate tweened sketches that i don't think you could readily program into a paint preset.
I was thinking about a way to derive a caricatured sketch to use for movie processing that would morph tween the sketch of the source frames off of a standard model. So you extrapolate the bezier interpolation. So maybe that's a way to do it? If i figure that out more and can get it to work i'll post a few examples.