feat: add chapter scenes

samples/chapters/cubes.yml

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+- add: world
+  max-reflective-depth: 8
+
+- define: sky-blue
+  value: [0.2, 0.35, 0.78]
+- define: dark-gray
+  value: [0.25, 0.25, 0.25]
+- define: light-gray
+  value: [0.7, 0.7, 0.7]
+- define: brown
+  value: [0.4, 0.2, 0.1]
+- define: green1
+  value: [0.42, 0.55, 0.42]
+- define: green2
+  value: [0.32, 0.55, 0.42]
+- define: purple
+  value: [0.4, 0.2, 0.3]
+- define: blue
+  value: [0.2, 0.3, 0.4]
+
+- define: wood-material
+  value:
+    color: brown
+    reflectivity: 0.0
+
+- define: checkered_floor
+  value:
+    pattern:
+      type: checkers
+      colors:
+        - dark-gray
+        - light-gray
+      transform:
+      - [rotate-y, FRAC_PI_4]
+      - [scale-uniform, 0.75]
+    reflectivity: 0.05
+
+- define: striped_walls
+  value:
+    pattern:
+      type: stripe
+      colors:
+        - green1
+        - green2
+      transform:
+      - [scale-uniform, 0.03125]  # 0.125 / 4
+      - [rotate-z, FRAC_PI_4]
+
+- add: light
+  intensity: WHITE
+  at: [-3, 5, 3]
+
+- add: SCENE_CAMERA
+  from: [-1, 2.6, 4.75]
+  to: [0, 1, 0]
+  up: [0, 1, 0]
+  fov: 0.885
+
+# Skybox
+- add: cube
+  material:
+    color: sky-blue
+  transform:
+    - [scale-uniform, 10]
+
+# Floor
+- add: plane
+  material: checkered_floor
+
+# Table legs
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.08, 1, 0.08]
+    - [translate, 1, 0.5, 1]
+
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.08, 1, 0.08]
+    - [translate, -1, 0.5, 1]
+
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.08, 1, 0.08]
+    - [translate, 1, 0.5, -1]
+
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.08, 1, 0.08]
+    - [translate, -1, 0.5, -1]
+
+# Table top
+- add: cube
+  material:
+    extend: wood-material
+    value:
+      reflectivity: 0.05
+  transform:
+    - [scale, 1.5, 0.05, 1.25]
+    - [translate, 0, 1.5, 0]
+
+# Walls
+- add: cube
+  material: striped_walls
+  transform:
+    - [scale-uniform, 5]
+
+# Mirror frame
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.05, 1.55, 0.01]
+    - [translate, 2.5, 2.25, -5]
+
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.05, 1.55, 0.01]
+    - [translate, -2.5, 2.25, -5]
+
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.05, 2.55, 0.01]
+    - [rotate-z, FRAC_PI_2]
+    - [translate, 0, 3.75, -5]
+
+- add: cube
+  material: wood-material
+  transform:
+    - [scale, 0.05, 2.55, 0.01]
+    - [rotate-z, FRAC_PI_2]
+    - [translate, 0, 0.75, -5]
+
+# Mirror
+- add: cube
+  material: MIRROR_MATERIAL
+  transform:
+    - [scale, 2.5, 1.5, 0.01]
+    - [translate, 0, 2.25, -5]
+    - [translate, 0, 0, 0.005]
+
+# Glass cube
+- add: cube
+  material: GLASS_MATERIAL
+  transform:
+    - [scale-uniform, 0.125]
+    - [translate, 0.1, 1.65, -0.1]
+
+# Tinted cube
+- add: cube
+  material:
+    color: purple
+    extend: GLASS_MATERIAL
+  transform:
+    - [scale, 0.2, 0.05, 0.075]
+    - [rotate-y, 0.70685835]  # FRAC_PI_4 * 0.9
+    - [translate, -0.4, 1.6, 0.4]
+
+# Pattern cube
+- add: cube
+  material:
+    pattern:
+      type: checkers
+      colors:
+        - purple
+        - blue
+      transform:
+      - [scale-uniform, 0.05]
+  transform:
+    - [scale-uniform, 0.15]
+    - [rotate-y, -0.39269908]  # -FRAC_PI_6 * 0.75
+    - [translate, 0.5, 1.7, 0.6]
+
+# Mirror cube
+- add: cube
+  material: MIRROR_MATERIAL
+  transform:
+    - [scale-uniform, 0.15]
+    - [rotate-y, 0.39269908]  # FRAC_PI_6 * 0.75
+    - [translate, -0.75, 1.7, 0.1]

samples/chapters/cylinders.yml

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+- add: world
+
+- define: sky-blue
+  value: [0.2, 0.35, 0.78]
+- define: red
+  value: [0.8, 0.2, 0.2]
+- define: brown
+  value: [0.67, 0.57, 0.38]
+- define: vanilla
+  value: [0.95, 0.89, 0.67]
+- define: chocolate
+  value: [0.48, 0.24, 0.0]
+
+- add: light
+  intensity: WHITE
+  at: [-10, 10, -10]
+
+- add: SCENE_CAMERA
+  from: [0, 1.5, -5]
+  to: [0, 1, 0]
+  up: [0, 1, 0]
+  fov: FRAC_PI_3
+
+# Skybox
+- add: cube
+  material:
+    color: sky-blue
+  transform:
+    - [scale-uniform, 10]
+
+- define: arrow-transform
+  value:
+    - [rotate-z, -FRAC_PI_4]
+    - [translate, -0.5, 0, 0]
+
+# Arrow body
+- add: cylinder
+  min: -0.5
+  max: 0.5
+  closed: true
+  material:
+    color: red
+  transform:
+    - [scale, 0.1, 1, 0.1]
+    - arrow-transform
+
+# Arrow head
+- add: cone
+  min: -1
+  max: 0
+  closed: true
+  material:
+    color: red
+  transform:
+    - [scale, 0.2, 0.5, 0.2]
+    - [translate, 0, 1, 0]
+    - arrow-transform
+
+# Ice cream cone
+- add: cone
+  min: 0
+  max: 1
+  closed: false
+
+  material:
+    color: brown
+  transform:
+    - [scale, 0.5, 1, 0.5]
+    - [translate, 1, -0.15, 0]
+
+# Vanilla scoop
+- add: sphere
+  material:
+    color: vanilla
+  transform:
+    - [scale-uniform, 0.5]
+    - [translate, 1, 1, 0]
+
+# Chocolate scoop
+- add: sphere
+  material:
+    color: chocolate
+  transform:
+    - [scale-uniform, 0.5]
+    - [translate, 1, 1.75, 0]

samples/chapters/groups.yml

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+- add: light
+  intensity: WHITE
+  at: [-10, 10, 10]
+
+# Hexagon part (cylinder + corner sphere)
+- define: hexagon-part
+  value:
+    add: group
+    children:
+      - add: cylinder
+        min: 0
+        max: 1
+        closed: false
+        transform:
+          - [scale, 0.25, 1, 0.25]
+          - [rotate-z, -FRAC_PI_2]
+          - [rotate-y, -FRAC_PI_6]
+          - [translate, 0, 0, -1]
+      - add: sphere
+        transform:
+          - [scale-uniform, 0.25]
+          - [translate, 0, 0, -1]
+
+# Complete hexagon (6 rotated parts)
+- add: group
+  transform:
+    - [rotate-x, FRAC_PI_3]
+    - [rotate-z, -FRAC_PI_6]
+    - [translate, 0, 0, -3]
+  children:
+    - add: group
+      transform:
+        - [rotate-y, FRAC_PI_3]
+      children:
+        - add: hexagon-part
+        - add: group
+          transform:
+            - [rotate-y, FRAC_PI_3]
+          children:
+            - add: hexagon-part
+              material:
+                value: GREEN
+            - add: group
+              transform:
+                - [rotate-y, FRAC_PI_3]
+              children:
+                - add: hexagon-part
+                - add: group
+                  transform:
+                    - [rotate-y, FRAC_PI_3]
+                  children:
+                    - add: hexagon-part
+                    - add: group
+                      transform:
+                        - [rotate-y, FRAC_PI_3]
+                      children:
+                        - add: hexagon-part
+                        - add: group
+                          transform:
+                            - [rotate-y, FRAC_PI_3]
+                          children:
+                            - add: hexagon-part

samples/chapters/making_patterns.yml

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+- add: world
+
+- define: cyan
+  value: [0.15, 0.6, 0.7]
+- define: magenta
+  value: [0.5, 0.1, 0.4]
+- define: white
+  value: [1.0, 1.0, 1.0]
+- define: red
+  value: [1.0, 0.0, 0.0]
+
+- add: light
+  intensity: white
+  at: [-10, 10, -10]
+
+- add: SCENE_CAMERA
+
+# Floor plane with ring pattern
+- add: plane
+  material:
+    pattern:
+      type: ring
+      colors:
+        - cyan
+        - magenta
+      transform:
+        - [scale-uniform, 0.25]
+
+# Sphere with checkered pattern
+- add: sphere
+  material:
+    pattern:
+      type: checkers
+      colors:
+        - white
+        - red
+      transform:
+        - [scale-uniform, 0.5]
+  transform:
+    - [translate, 0, 1, 0]