beta1.1

app.py

@@ -280,11 +280,12 @@ async def generate_model(request: GenerateRequest):
             
         # 3. Flatten coordinates for PyPRT InitialShape
         # Frontend ENU convention:  x = east,  y = north
-        # PyPRT/CGA convention:     X = east,  Y = height (up),  Z = north (depth)
-        # Mapping: [enu_x, 0, enu_y]  →  [CGA_X, CGA_Y=0, CGA_Z]
+        # PyPRT/CGA convention:     X = east,  Y = height (up),  Z = south (depth, negated)
+        # CGA Z increases southward, but ENU Y increases northward — negate to align.
+        # Mapping: [enu_x, 0, -enu_y]  →  [CGA_X, CGA_Y=0, CGA_Z]
         flattened_coords = []
         for p in coords:
-            flattened_coords.extend([p[0], 0, p[1]])
+            flattened_coords.extend([p[0], 0, -p[1]])
 
 
         indices = list(range(len(coords)))
@@ -713,9 +714,10 @@ async def get_model_report(request: GenerateRequest):
         if coords[0] == coords[-1]:
             coords = coords[:-1]
 
+        # Same CGA Z-axis negation as /generate: ENU Y = north, CGA Z = south
         flattened_coords = []
         for p in coords:
-            flattened_coords.extend([p[0], 0, p[1]])
+            flattened_coords.extend([p[0], 0, -p[1]])
 
         indices = list(range(len(coords)))
         face_counts = [len(coords)]