#1322 Add matrix generator example Luau code

resources/main-presets/factory/generic/unsorted/generate-matrix.luau

@@ -0,0 +1,54 @@
+local playtime = require("playtime")
+
+local column_count = 10
+local row_count = 200
+
+-- Build columns
+local columns = {}
+local clip_index = 0
+for c = 0, column_count - 1 do
+    local slots: { playtime.Slot } = {}
+    for r = 0, row_count - 1 do
+        if (c % 2 == 0 and r % 2 == 0) or (c % 2 == 1 and r % 2 == 1) then
+            local slot = playtime.Slot {
+                row = r,
+                clips = {
+                    playtime.Clip {
+                        name = `Clip {c + 1}/{r + 1}`,
+                        color = playtime.ClipColor.PaletteColor {
+                            index = 5 + clip_index % 17,
+                        },
+                    },
+                },
+            }
+            table.insert(slots, slot)
+            clip_index += 1
+        end
+    end
+    local column = playtime.Column {
+        slots = slots or nil,
+    }
+    table.insert(columns, column)
+end
+
+-- Build rows
+local rows = {}
+for r = 1, row_count do
+    local row = playtime.Row {
+        name = `Scene {r}`,
+    }
+    table.insert(rows, row)
+end
+
+-- Build matrix
+local matrix = playtime.Matrix {
+    columns = columns,
+    rows = rows,
+}
+
+-- Return result
+return {
+    kind = "ClipMatrix",
+    version = "2.16.14",
+    value = matrix,
+}