Scripts/global/transition.lua

@@ -712,7 +712,23 @@ function SongTransition.new(title, subtitle, is_second)
     return self
 end
 
+-- timeline the engine reads (rainbow rise for the dan art, done); wall clock, not the movie's
+local RISE_MS, RISE_DIST = 266.0, 612
+local SCENE1_MS, SCENE2_MS = 532.0, 133.0
+function SongTransition:state()
+    local t = self.rt or 0
+    local rise = RISE_DIST * math.max(0, math.min(1, t / RISE_MS)) ^ 3
+    if self.is_second then
+        return { rainbow_up = rise, fade_out = math.max(0, 1 - t / SCENE2_MS), finished = t >= SCENE2_MS }
+    end
+    return { rainbow_up = rise, fade = math.min(1, t / SCENE1_MS), finished = t >= SCENE1_MS }
+end
+
+function SongTransition:start() self.rt0 = nil end
+
 function SongTransition:update(current_ms, rainbow_up, info_fade)
+    if not self.rt0 then self.rt0 = current_ms end
+    self.rt = current_ms - self.rt0
     if self.last_ms then
         self.t = self.t + math.max(0, math.min(MAX_DT, current_ms - self.last_ms))
     end