feat(cnn_v3): gen_sample tool + 7 simple training samples

- pack_photo_sample.py: --target now required (no albedo fallback)
- gen_sample: bash wrapper with positional args (input target output_dir)
- input/photo7.jpg: copy of photo2 (second style target)
- target_1: photo2_1_out→photo2_out, photo2_2_out→photo7_out
- dataset/simple/sample_001..007: 7 packed photo/target pairs

handoff(Gemini): training data ready; next step is train_cnn_v3.py run

54 files changed, 31 insertions, 7 deletions

diff --git a/cnn_v3/training/dataset/simple/sample_001/albedo.png b/cnn_v3/training/dataset/simple/sample_001/albedo.png
new file mode 100644
index 0000000..68220b3
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_001/albedo.png
diff --git a/cnn_v3/training/dataset/simple/sample_001/depth.png b/cnn_v3/training/dataset/simple/sample_001/depth.png
new file mode 100644
index 0000000..5708605
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_001/depth.png
diff --git a/cnn_v3/training/dataset/simple/sample_001/matid.png b/cnn_v3/training/dataset/simple/sample_001/matid.png
new file mode 100644
index 0000000..2561108
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_001/matid.png
diff --git a/cnn_v3/training/dataset/simple/sample_001/normal.png b/cnn_v3/training/dataset/simple/sample_001/normal.png
new file mode 100644
index 0000000..489f629
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_001/normal.png
diff --git a/cnn_v3/training/dataset/simple/sample_001/shadow.png b/cnn_v3/training/dataset/simple/sample_001/shadow.png
new file mode 100644
index 0000000..f356fb2
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_001/shadow.png
diff --git a/cnn_v3/training/dataset/simple/sample_001/target.png b/cnn_v3/training/dataset/simple/sample_001/target.png
new file mode 100644
index 0000000..268e167
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_001/target.png
diff --git a/cnn_v3/training/dataset/simple/sample_001/transp.png b/cnn_v3/training/dataset/simple/sample_001/transp.png
new file mode 100644
index 0000000..2561108
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_001/transp.png
diff --git a/cnn_v3/training/dataset/simple/sample_002/albedo.png b/cnn_v3/training/dataset/simple/sample_002/albedo.png
new file mode 100644
index 0000000..80f4f1c
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_002/albedo.png
diff --git a/cnn_v3/training/dataset/simple/sample_002/depth.png b/cnn_v3/training/dataset/simple/sample_002/depth.png
new file mode 100644
index 0000000..5708605
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_002/depth.png
diff --git a/cnn_v3/training/dataset/simple/sample_002/matid.png b/cnn_v3/training/dataset/simple/sample_002/matid.png
new file mode 100644
index 0000000..2561108
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_002/matid.png
diff --git a/cnn_v3/training/dataset/simple/sample_002/normal.png b/cnn_v3/training/dataset/simple/sample_002/normal.png
new file mode 100644
index 0000000..489f629
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_002/normal.png
diff --git a/cnn_v3/training/dataset/simple/sample_002/shadow.png b/cnn_v3/training/dataset/simple/sample_002/shadow.png
new file mode 100644
index 0000000..f356fb2
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_002/shadow.png
diff --git a/cnn_v3/training/dataset/simple/sample_002/target.png b/cnn_v3/training/dataset/simple/sample_002/target.png
new file mode 100644
index 0000000..d1d7192
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_002/target.png
diff --git a/cnn_v3/training/dataset/simple/sample_002/transp.png b/cnn_v3/training/dataset/simple/sample_002/transp.png
new file mode 100644
index 0000000..2561108
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_002/transp.png
diff --git a/cnn_v3/training/dataset/simple/sample_003/albedo.png b/cnn_v3/training/dataset/simple/sample_003/albedo.png
new file mode 100644
index 0000000..fe714bc
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_003/albedo.png
diff --git a/cnn_v3/training/dataset/simple/sample_003/depth.png b/cnn_v3/training/dataset/simple/sample_003/depth.png
new file mode 100644
index 0000000..eac97a6
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_003/depth.png
diff --git a/cnn_v3/training/dataset/simple/sample_003/matid.png b/cnn_v3/training/dataset/simple/sample_003/matid.png
new file mode 100644
index 0000000..60a5b09
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_003/matid.png
diff --git a/cnn_v3/training/dataset/simple/sample_003/normal.png b/cnn_v3/training/dataset/simple/sample_003/normal.png
new file mode 100644
index 0000000..36dd1fd
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_003/normal.png
diff --git a/cnn_v3/training/dataset/simple/sample_003/shadow.png b/cnn_v3/training/dataset/simple/sample_003/shadow.png
new file mode 100644
index 0000000..c943f56
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_003/shadow.png
diff --git a/cnn_v3/training/dataset/simple/sample_003/target.png b/cnn_v3/training/dataset/simple/sample_003/target.png
new file mode 100644
index 0000000..56205ca
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_003/target.png
diff --git a/cnn_v3/training/dataset/simple/sample_003/transp.png b/cnn_v3/training/dataset/simple/sample_003/transp.png
new file mode 100644
index 0000000..60a5b09
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_003/transp.png
diff --git a/cnn_v3/training/dataset/simple/sample_004/albedo.png b/cnn_v3/training/dataset/simple/sample_004/albedo.png
new file mode 100644
index 0000000..a1b817d
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_004/albedo.png
diff --git a/cnn_v3/training/dataset/simple/sample_004/depth.png b/cnn_v3/training/dataset/simple/sample_004/depth.png
new file mode 100644
index 0000000..083c4a3
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_004/depth.png
diff --git a/cnn_v3/training/dataset/simple/sample_004/matid.png b/cnn_v3/training/dataset/simple/sample_004/matid.png
new file mode 100644
index 0000000..f14721f
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_004/matid.png
diff --git a/cnn_v3/training/dataset/simple/sample_004/normal.png b/cnn_v3/training/dataset/simple/sample_004/normal.png
new file mode 100644
index 0000000..0694ac1
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_004/normal.png
diff --git a/cnn_v3/training/dataset/simple/sample_004/shadow.png b/cnn_v3/training/dataset/simple/sample_004/shadow.png
new file mode 100644
index 0000000..9b6a5e0
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_004/shadow.png
diff --git a/cnn_v3/training/dataset/simple/sample_004/target.png b/cnn_v3/training/dataset/simple/sample_004/target.png
new file mode 100644
index 0000000..019d7a8
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_004/target.png
diff --git a/cnn_v3/training/dataset/simple/sample_004/transp.png b/cnn_v3/training/dataset/simple/sample_004/transp.png
new file mode 100644
index 0000000..f14721f
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_004/transp.png
diff --git a/cnn_v3/training/dataset/simple/sample_005/albedo.png b/cnn_v3/training/dataset/simple/sample_005/albedo.png
new file mode 100644
index 0000000..5dfada7
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_005/albedo.png
diff --git a/cnn_v3/training/dataset/simple/sample_005/depth.png b/cnn_v3/training/dataset/simple/sample_005/depth.png
new file mode 100644
index 0000000..db65c11
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_005/depth.png
diff --git a/cnn_v3/training/dataset/simple/sample_005/matid.png b/cnn_v3/training/dataset/simple/sample_005/matid.png
new file mode 100644
index 0000000..f098c4d
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_005/matid.png
diff --git a/cnn_v3/training/dataset/simple/sample_005/normal.png b/cnn_v3/training/dataset/simple/sample_005/normal.png
new file mode 100644
index 0000000..40305ec
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_005/normal.png
diff --git a/cnn_v3/training/dataset/simple/sample_005/shadow.png b/cnn_v3/training/dataset/simple/sample_005/shadow.png
new file mode 100644
index 0000000..8e270d3
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_005/shadow.png
diff --git a/cnn_v3/training/dataset/simple/sample_005/target.png b/cnn_v3/training/dataset/simple/sample_005/target.png
new file mode 100644
index 0000000..41ead45
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_005/target.png
diff --git a/cnn_v3/training/dataset/simple/sample_005/transp.png b/cnn_v3/training/dataset/simple/sample_005/transp.png
new file mode 100644
index 0000000..f098c4d
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_005/transp.png
diff --git a/cnn_v3/training/dataset/simple/sample_006/albedo.png b/cnn_v3/training/dataset/simple/sample_006/albedo.png
new file mode 100644
index 0000000..6fd43d4
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_006/albedo.png
diff --git a/cnn_v3/training/dataset/simple/sample_006/depth.png b/cnn_v3/training/dataset/simple/sample_006/depth.png
new file mode 100644
index 0000000..4ccb0bc
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_006/depth.png
diff --git a/cnn_v3/training/dataset/simple/sample_006/matid.png b/cnn_v3/training/dataset/simple/sample_006/matid.png
new file mode 100644
index 0000000..32e1b1c
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_006/matid.png
diff --git a/cnn_v3/training/dataset/simple/sample_006/normal.png b/cnn_v3/training/dataset/simple/sample_006/normal.png
new file mode 100644
index 0000000..e2623bd
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_006/normal.png
diff --git a/cnn_v3/training/dataset/simple/sample_006/shadow.png b/cnn_v3/training/dataset/simple/sample_006/shadow.png
new file mode 100644
index 0000000..880ccf9
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_006/shadow.png
diff --git a/cnn_v3/training/dataset/simple/sample_006/target.png b/cnn_v3/training/dataset/simple/sample_006/target.png
new file mode 100644
index 0000000..383e2d3
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_006/target.png
diff --git a/cnn_v3/training/dataset/simple/sample_006/transp.png b/cnn_v3/training/dataset/simple/sample_006/transp.png
new file mode 100644
index 0000000..32e1b1c
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_006/transp.png
diff --git a/cnn_v3/training/dataset/simple/sample_007/albedo.png b/cnn_v3/training/dataset/simple/sample_007/albedo.png
new file mode 100644
index 0000000..80f4f1c
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_007/albedo.png
diff --git a/cnn_v3/training/dataset/simple/sample_007/depth.png b/cnn_v3/training/dataset/simple/sample_007/depth.png
new file mode 100644
index 0000000..5708605
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_007/depth.png
diff --git a/cnn_v3/training/dataset/simple/sample_007/matid.png b/cnn_v3/training/dataset/simple/sample_007/matid.png
new file mode 100644
index 0000000..2561108
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_007/matid.png
diff --git a/cnn_v3/training/dataset/simple/sample_007/normal.png b/cnn_v3/training/dataset/simple/sample_007/normal.png
new file mode 100644
index 0000000..489f629
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_007/normal.png
diff --git a/cnn_v3/training/dataset/simple/sample_007/shadow.png b/cnn_v3/training/dataset/simple/sample_007/shadow.png
new file mode 100644
index 0000000..f356fb2
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_007/shadow.png
diff --git a/cnn_v3/training/dataset/simple/sample_007/target.png b/cnn_v3/training/dataset/simple/sample_007/target.png
new file mode 100644
index 0000000..ea276e4
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_007/target.png
diff --git a/cnn_v3/training/dataset/simple/sample_007/transp.png b/cnn_v3/training/dataset/simple/sample_007/transp.png
new file mode 100644
index 0000000..2561108
--- /dev/null
+++ b/cnn_v3/training/dataset/simple/sample_007/transp.png
diff --git a/cnn_v3/training/gen_sample b/cnn_v3/training/gen_sample
new file mode 100755
index 0000000..21519f1
--- /dev/null
+++ b/cnn_v3/training/gen_sample
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# gen_sample — pack an input/target photo pair into a CNN v3 sample directory.
+#
+# Usage:
+#   gen_sample <input> <target> <output_dir>
+#
+# Example:
+#   gen_sample input/photo1.jpg target_1/photo1_out.png dataset/simple/sample_001
+
+set -euo pipefail
+
+if [ $# -ne 3 ]; then
+    echo "Usage: gen_sample <input> <target> <output_dir>" >&2
+    exit 1
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+python3 "$SCRIPT_DIR/pack_photo_sample.py" \
+    --photo  "$1" \
+    --target "$2" \
+    --output "$3"
diff --git a/cnn_v3/training/input/photo7.jpg b/cnn_v3/training/input/photo7.jpg
new file mode 100644
index 0000000..a662fa8
--- /dev/null
+++ b/cnn_v3/training/input/photo7.jpg
diff --git a/cnn_v3/training/pack_photo_sample.py b/cnn_v3/training/pack_photo_sample.py
index b2943fb..ca80301 100644
--- a/cnn_v3/training/pack_photo_sample.py
+++ b/cnn_v3/training/pack_photo_sample.py
@@ -18,7 +18,8 @@ mip1 and mip2 are computed on-the-fly by the dataloader from albedo.
 prev = zero during training (no temporal history).
 
 Usage:
-    python3 pack_photo_sample.py --photo photos/img_001.png \\
+    python3 pack_photo_sample.py --photo input/photo1.jpg \\
+                                 --target target_1/photo1_out.png \\
                                  --output dataset/simple/sample_001/
 
 Dependencies:
@@ -56,7 +57,7 @@ def pyrdown(img: np.ndarray) -> np.ndarray:
 
 # ---- Main packing ----
 
-def pack_photo_sample(photo_path: str, output_dir: str) -> None:
+def pack_photo_sample(photo_path: str, target_path: str, output_dir: str) -> None:
     os.makedirs(output_dir, exist_ok=True)
 
     print(f"[pack_photo_sample] Loading {photo_path} …")
@@ -110,9 +111,10 @@ def pack_photo_sample(photo_path: str, output_dir: str) -> None:
         os.path.join(output_dir, "transp.png")
     )
 
-    # ---- target — albedo (= photo; no GT styled target) ----
-    # Store as RGBA (keep alpha for potential masking by the dataloader).
-    target_u8 = (np.clip(img_np, 0, 1) * 255.0).astype(np.uint8)
+    # ---- target — styled ground truth ----
+    print(f"  Loading target {target_path} …")
+    target_img = Image.open(target_path).convert("RGBA")
+    target_u8 = np.asarray(target_img, dtype=np.uint8)
     Image.fromarray(target_u8, mode="RGBA").save(
         os.path.join(output_dir, "target.png")
     )
@@ -129,7 +131,6 @@ def pack_photo_sample(photo_path: str, output_dir: str) -> None:
     print("  Files: albedo.png  normal.png  depth.png  matid.png  "
           "shadow.png  transp.png  target.png")
     print("  Note: normal/depth/matid are zeroed (no geometry data).")
-    print("  Note: target = albedo (no ground-truth styled target).")
 
 
 def main():
@@ -138,10 +139,12 @@ def main():
     )
     parser.add_argument("--photo",  required=True,
                         help="Input photo file (RGB or RGBA PNG/JPG)")
+    parser.add_argument("--target", required=True,
+                        help="Styled ground-truth image (PNG/JPG)")
     parser.add_argument("--output", required=True,
                         help="Output directory for sample files")
     args = parser.parse_args()
-    pack_photo_sample(args.photo, args.output)
+    pack_photo_sample(args.photo, args.target, args.output)
 
 
 if __name__ == "__main__":
diff --git a/cnn_v3/training/target_1/photo2_1_out.png b/cnn_v3/training/target_1/photo2_out.png
index 5398232..5398232 100644
--- a/cnn_v3/training/target_1/photo2_1_out.png
+++ b/cnn_v3/training/target_1/photo2_out.png
diff --git a/cnn_v3/training/target_1/photo2_2_out.png b/cnn_v3/training/target_1/photo7_out.png
index b0a76bd..b0a76bd 100644
--- a/cnn_v3/training/target_1/photo2_2_out.png
+++ b/cnn_v3/training/target_1/photo7_out.png