diff --git a/olaflow/.gitignore b/olaflow/.gitignore
new file mode 100644
index 0000000..b825560
--- /dev/null
+++ b/olaflow/.gitignore
@@ -0,0 +1,2 @@
+/inp*
+/out*
diff --git a/olaflow/config.ini b/olaflow/config.ini
new file mode 100644
index 0000000..57bed2c
--- /dev/null
+++ b/olaflow/config.ini
@@ -0,0 +1,8 @@
+[swash]
+npz_out=../swash/inp_post
+
+[bathy]
+bathy=../swash/data/bathyhires.dat
+hstru=../swash/data/Hstru.dat
+scale=[0.5,10,1]
+out=out_bathy
diff --git a/olaflow/processing/bathy.py b/olaflow/processing/bathy.py
index ad61b3e..c2d8906 100644
--- a/olaflow/processing/bathy.py
+++ b/olaflow/processing/bathy.py
@@ -2,12 +2,11 @@ import argparse
 import configparser
 import logging
 import pathlib
-import subprocess
-import tempfile
-import shutil
 
 import numpy as np
 
+from .stl import stl_from_1d
+
 parser = argparse.ArgumentParser(
     description="Convert swash output to olaFlow input"
 )
@@ -22,14 +21,17 @@ config = configparser.ConfigParser()
 config.read("config.ini")
 
 bathy = np.loadtxt(config.get("bathy", "bathy"))
+poro = bathy + np.loadtxt(config.get("bathy", "hstru"))
 
-with tempfile.TemporaryDirectory() as tmppath:
-    tmpdir = pathlib.Path(tmppath)
-    np.savetxt(tmpdir.joinpath("bathy.dat"), np.stack((bathy, bathy)))
-    shutil.copy2(
-        pathlib.Path(config.get("bathy", "scad")), tmpdir.joinpath("scad")
-    )
-
-    subprocess.run(("openscad", "scad", "-o", "bathy.stl"), cwd=tmpdir)
-
-    shutil.copy2(tmpdir.joinpath("bathy.stl"), config.get("bathy", "out"))
+out = pathlib.Path(config.get("bathy", "out"))
+out.mkdir(exist_ok=True)
+stl_from_1d(
+    bathy,
+    out.joinpath("bathy.stl"),
+    config.get("bathy", "scale"),
+)
+stl_from_1d(
+    poro,
+    out.joinpath("poro.stl"),
+    config.get("bathy", "scale"),
+)
diff --git a/olaflow/processing/stl.py b/olaflow/processing/stl.py
new file mode 100644
index 0000000..a69bbf3
--- /dev/null
+++ b/olaflow/processing/stl.py
@@ -0,0 +1,18 @@
+import pathlib
+import shutil
+import subprocess
+import tempfile
+
+import numpy as np
+
+
+def stl_from_1d(data, output, scale=[1, 1, 1]):
+    with tempfile.TemporaryDirectory() as tmppath:
+        tmpdir = pathlib.Path(tmppath)
+        np.savetxt(tmpdir.joinpath("data.dat"), np.stack((data, data)))
+        with open(tmpdir.joinpath("scad"), "wt") as scad:
+            scad.write(f"""scale({scale})surface("data.dat");""")
+
+        subprocess.run(("openscad", "scad", "-o", "data.stl"), cwd=tmpdir)
+
+        shutil.copy2(tmpdir.joinpath("data.stl"), output)