Switched glyph brightness and cycle speeds to being derived from a continuous function. Introduced a quick way to mess with code parameters.

TODO.txt

@@ -1,21 +1,14 @@
 TODO:
 
-Revisit rain logic
-  Rework columns to support multiple drops at once
-    Idea 1: implement in JS, then migrate to shaders that operate on double buffer RTTs
-    Idea 2: switch to some kind of continuous noise source
-      Remember, cycling needs to be continuous too (but then mod 1)
-      Vertex shader uses continuous function to derive UV and brightness
-    Static mesh: Give each vertex of a glyph the same XY, different vec2 corners
-
-
+Migrate rain logic to shaders that operate on double buffer RTTs
 
 Reach out to Ashley's partner about producing sounds
 
-
 Much later:
   Optimization: calculate texture derivatives on CPU, pass in as a uniform
   Optimization: simpler bloom replacement
   Dissolve threejs project into webgl project
     Maybe webgl2 project?
   Flashing row effect?
+  More patterns?
+    Symbol duplication is common