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+---
+title: >-
+ Visualization 7
+description: >-
+ Feedback Loop.
+series: viz
+tags: tech art
+---
+
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+Once again, this visualization iterates upon the previous. In the last one the
+top layer was able to "see" the bottom, and was therefore able to bolster or
+penalize its own elements which were on or near bottom layer elements, but not
+vice-versa. This time both layers can see each other, and the "Layer Neighbor
+Scalar" can be used to adjust lifetime of elements which are on/near elements of
+the neighboring layer.
+
+By default, the bottom layer has a high affinity to the top, and the top layer
+has a some (but not as much) affinity in return.
+
+Another addition is the "likeness" scalar. Likeness is defined as the degree to
+which one element is like another. In this visualization likeness is determined
+by color. The "Layer Neighbor Likeness Scalar" adjusts the lifetime of elements
+based on how like they are to nearby elements on the neighboring layer.
+
+By default, the top layer has a high affinity for the bottom's color, but the
+bottom doesn't care about the top's color at all (and so its color will drift
+aimlessly).
+
+And finally "Color Drift" can be used to adjust the degree to which the color of
+new elements can diverge from its parents. This has always been hardcoded, but
+can now be adjusted separately across the different layers.
+
+In the default configuration the top layer will (eventually) converge to roughly
+match the bottom both in shape and color. When I first implemented the likeness
+scaling I thought it was broken, because the top would never converge to the
+bottom's color.
+
+What I eventually realized was that the top must have a higher color drift than
+the bottom in order for it to do so, otherwise the top would always be playing
+catchup. However, if the drift difference is _too_ high then the top layer
+becomes chaos and also doesn't really follow the color of the bottom. A
+difference of 10 (degrees out of 360) is seemingly enough.
+
+