add camera motion recording tool

3 files changed, 98 insertions, 1 deletions

diff --git a/client/player/camera_recorder.gd b/client/player/camera_recorder.gd
new file mode 100644
index 00000000..8f398c2b
--- /dev/null
+++ b/client/player/camera_recorder.gd
@@ -0,0 +1,92 @@
+# Hurry Curry! - a game about cooking
+# Copyright (C) 2025 Hurry Curry! contributors
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, version 3 of the License only.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+extends Node
+
+@export var record: bool = false
+@export var replay: bool = false
+@export_file var recording_path: String = ""
+
+@onready var camera: Camera3D = $".."
+
+var time = 0.
+var keyframes = [] # Array<[float, Transform3D]>
+
+func _ready() -> void:
+	if record and replay: return push_error("concurrent ecord and replay is not supported")
+	if replay: load_recording()
+
+func _exit_tree() -> void:
+	if record: save_recording()
+
+func load_recording():
+	print("Loading replay...")
+	var file := FileAccess.open(recording_path, FileAccess.READ)
+	var text := file.get_as_text()
+	keyframes.clear()
+	for line in text.split("\n"):
+		if line == "": continue
+		var toks = line.split(",")
+		var time2 = float(toks[0])
+		var transform = parse_transform(toks[1])
+		var fov = float(toks[2])
+		keyframes.push_back([time2, transform, fov])
+	print("Done")
+
+func save_recording():
+	print("Saving replay...")
+	var file := FileAccess.open(recording_path, FileAccess.WRITE)
+	var out = ""
+	for k in keyframes:
+		out += "%f,%s,%f\n" % [k[0], serialize_transform(k[1]), k[2]]
+	file.store_string(out)
+	print("Done")
+
+func serialize_transform(t: Transform3D) -> String:
+	return "%f|%f|%f|%f|%f|%f|%f|%f|%f|%f|%f|%f" % [
+		t.basis.x.x, t.basis.y.x, t.basis.z.x, t.origin.x,
+		t.basis.x.y, t.basis.y.y, t.basis.z.y, t.origin.y,
+		t.basis.x.z, t.basis.y.z, t.basis.z.z, t.origin.z,
+	]
+
+func parse_transform(s: String) -> Transform3D:
+	var c := s.split("|")
+	var t := Transform3D.IDENTITY
+	t.basis.x.x = float(c[0])
+	t.basis.y.x = float(c[1])
+	t.basis.z.x = float(c[2])
+	t.origin.x = float(c[3])
+	t.basis.x.y = float(c[4])
+	t.basis.y.y = float(c[5])
+	t.basis.z.y = float(c[6])
+	t.origin.y = float(c[7])
+	t.basis.x.z = float(c[8])
+	t.basis.y.z = float(c[9])
+	t.basis.z.z = float(c[10])
+	t.origin.z = float(c[11])
+	return t
+
+func _process(dt: float):
+	if Global.game_paused: return
+	time += dt
+	if record: keyframes.push_back([time, camera.global_transform, camera.fov])
+	if replay:
+		var index = keyframes.bsearch_custom([time], func (a, b): return a[0] < b[0])
+		if index >= keyframes.size(): return
+		var from = keyframes[max(0, index - 1)]
+		var to = keyframes[index]
+		var t = (time - from[0]) / (to[0] - from[0])
+		camera.global_transform = from[1].interpolate_with(to[1], t)
+		camera.fov = from[2] * (1. - t) + to[2] * t
diff --git a/client/player/camera_recorder.gd.uid b/client/player/camera_recorder.gd.uid
new file mode 100644
index 00000000..8d312732
--- /dev/null
+++ b/client/player/camera_recorder.gd.uid
@@ -0,0 +1 @@
+uid://b7wqp72o1bxvu
diff --git a/client/player/follow_camera.tscn b/client/player/follow_camera.tscn
index f753aad0..ac0040c9 100644
--- a/client/player/follow_camera.tscn
+++ b/client/player/follow_camera.tscn
@@ -1,7 +1,11 @@
-[gd_scene load_steps=2 format=3 uid="uid://b31mlnao6ybt8"]
+[gd_scene load_steps=3 format=3 uid="uid://b31mlnao6ybt8"]
 
 [ext_resource type="Script" uid="uid://eieoab04mpqc" path="res://player/follow_camera.gd" id="1_qipju"]
+[ext_resource type="Script" uid="uid://b7wqp72o1bxvu" path="res://player/camera_recorder.gd" id="2_12um7"]
 
 [node name="FollowCamera" type="Camera3D"]
 fov = 45.0
 script = ExtResource("1_qipju")
+
+[node name="CameraRecorder" type="Node" parent="."]
+script = ExtResource("2_12um7")