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README.md

@@ -1,20 +1,18 @@
----
-title: Step File Compare
-emoji: 🚀
-colorFrom: red
-colorTo: red
-sdk: docker
-app_port: 8501
-tags:
-- streamlit
-pinned: false
-short_description: 'Compares 3D Models '
-license: mit
----
 
-# Welcome to Streamlit!
+# STEP File Comparator
 
-Edit `/src/streamlit_app.py` to customize this app to your heart's desire. :heart:
+Upload and compare two STEP files with the same origin. This tool will calculate and visualize 3D geometric deviations.
 
-If you have any questions, checkout our [documentation](https://docs.streamlit.io) and [community
-forums](https://discuss.streamlit.io).
+## Features
+- STEP parsing with `pythonOCC-core`
+- Basic surface point deviation analysis
+- Streamlit frontend
+
+## Usage
+1. Upload two `.step` files
+2. View the max and average deviation
+3. Visualize with a simple deviation chart
+
+## Future Improvements
+- Add 3D viewer for live inspection
+- Export report to CSV

app.py

@@ -0,0 +1,68 @@
+
+import streamlit as st
+import tempfile
+from OCC.Extend.DataExchange import read_step_file
+from OCC.Core.BRep import BRep_Tool
+from OCC.Core.BRepMesh import BRepMesh_IncrementalMesh
+from OCC.Core.TopExp import TopExp_Explorer
+from OCC.Core.TopAbs import TopAbs_FACE
+from OCC.Core.TopoDS import topods_Face
+from OCC.Core.BRepTools import breptools_UVBounds
+from OCC.Core.gp import gp_Pnt
+
+def extract_faces_points(shape):
+    BRepMesh_IncrementalMesh(shape, 0.1)
+    exp = TopExp_Explorer(shape, TopAbs_FACE)
+    points = []
+
+    while exp.More():
+        face = topods_Face(exp.Current())
+        u_min, u_max, v_min, v_max = breptools_UVBounds(face)
+        for u in [u_min, (u_min + u_max)/2, u_max]:
+            for v in [v_min, (v_min + v_max)/2, v_max]:
+                pnt = gp_Pnt()
+                BRep_Tool().Surface(face).D0(u, v, pnt)
+                points.append((pnt.X(), pnt.Y(), pnt.Z()))
+        exp.Next()
+
+    return points
+
+def compare_step_files(file1, file2):
+    shape1 = read_step_file(file1)
+    shape2 = read_step_file(file2)
+
+    points1 = extract_faces_points(shape1)
+    points2 = extract_faces_points(shape2)
+
+    diffs = []
+    for p1, p2 in zip(points1, points2):
+        diff = ((p1[0]-p2[0])**2 + (p1[1]-p2[1])**2 + (p1[2]-p2[2])**2) ** 0.5
+        diffs.append(diff)
+
+    max_dev = max(diffs)
+    avg_dev = sum(diffs) / len(diffs)
+
+    return max_dev, avg_dev, diffs
+
+st.title("🔍 STEP File Comparison Tool")
+st.markdown("Upload two STEP files with the same origin and compare their 3D geometry.")
+
+uploaded_file1 = st.file_uploader("📤 Upload STEP File 1", type=["step", "stp"])
+uploaded_file2 = st.file_uploader("📤 Upload STEP File 2", type=["step", "stp"])
+
+if uploaded_file1 and uploaded_file2:
+    with tempfile.NamedTemporaryFile(delete=False) as tmp1:
+        tmp1.write(uploaded_file1.read())
+        path1 = tmp1.name
+
+    with tempfile.NamedTemporaryFile(delete=False) as tmp2:
+        tmp2.write(uploaded_file2.read())
+        path2 = tmp2.name
+
+    st.info("🔧 Processing and comparing files...")
+    max_dev, avg_dev, all_diffs = compare_step_files(path1, path2)
+
+    st.success(f"📏 Max Deviation: {max_dev:.3f} mm")
+    st.info(f"📉 Average Deviation: {avg_dev:.3f} mm")
+
+    st.line_chart(all_diffs[:100])

requirements.txt

@@ -1,3 +1,2 @@
-altair
-pandas
-streamlit
+streamlit
+pythonOCC-core