From 3aeef8fead04d390d71f867cda4fb1e2d18363e4 Mon Sep 17 00:00:00 2001
From: Mayeul Aubin <mayeul.aubin@iap.fr>
Date: Tue, 24 Jun 2025 11:42:54 +0200
Subject: [PATCH] convert snapshots

---
 .../scripts/convert_snapshot_to_density.py    | 73 +++++++++++++++++--
 1 file changed, 66 insertions(+), 7 deletions(-)

diff --git a/sbmy_control/scripts/convert_snapshot_to_density.py b/sbmy_control/scripts/convert_snapshot_to_density.py
index dadefed..869ee90 100644
--- a/sbmy_control/scripts/convert_snapshot_to_density.py
+++ b/sbmy_control/scripts/convert_snapshot_to_density.py
@@ -34,6 +34,55 @@ def convert_snapshot_to_density(snapshot_path, output_path, N=None, corner=(0.0,
     F.write(output_path)
     print("Density written to", output_path)
     print("Done.")
+    
+
+def convert_snapshots_to_density(snapshot_base_path, output_path, N=None, corner=(0.0, 0.0, 0.0)):
+    """
+    Convert multiple snapshots to density fields.
+
+    Parameters
+    ----------
+    snapshot_base_path : str
+        Base path for the snapshot files.
+    output_path : str
+        Path to the output density file.
+    N : int
+        Size of the density field grid (N x N x N).
+    corner : tuple of float
+        Corner of the box (x, y, z).
+    """
+    # Get all snapshot files with path "snapshot_base_path*"
+    import glob
+    snapshot_files = glob.glob(snapshot_base_path + "*")
+    if not snapshot_files:
+        raise FileNotFoundError(f"No snapshot files found at {snapshot_base_path}")
+    
+    A = None
+    F = None
+    
+    for snapshot_path in snapshot_files:
+        # Read the snapshot
+        print(f"Reading snapshot {snapshot_path}...")
+        snap = read_snapshot(snapshot_path)
+
+        if N is None:
+            N = snap.Np0
+
+        # Calculate density
+        print("Calculating density...")
+        F = get_density_pm_snapshot(snap, N, N, N, corner[0], corner[1], corner[2])
+        
+        if A is None:
+            A = F.data
+        else:
+            A += F.data
+    
+    F.data = A # Combine densities from all snapshots
+    # Write density to file
+    print("Writing density...")
+    F.write(output_path)
+    print("Density written to", output_path)
+    print("Done.")
 
 
 def console_main():
@@ -70,13 +119,23 @@ def console_main():
 
     args = parser.parse_args()
 
-    convert_snapshot_to_density(
-        snapshot_path=args.snapshot,
-        output_path=args.output,
-        N=args.N,
-        corner=args.corner,
-    )
+    if args.snapshot.endswith("h5") or args.snapshot.endswith("hdf5") or args.snapshot.endswith("gadget3"):
+        # If the snapshot is a single file, convert it to density
+        convert_snapshot_to_density(
+            snapshot_path=args.snapshot,
+            output_path=args.output,
+            N=args.N,
+            corner=args.corner,
+        )
+    else:
+        # If the snapshot is a base path, convert all snapshots to density
+        convert_snapshots_to_density(
+            snapshot_base_path=args.snapshot,
+            output_path=args.output,
+            N=args.N,
+            corner=args.corner,
+        )
 
 
 if __name__ == "__main__":
-    console_main()
\ No newline at end of file
+    console_main()