- Projection and extrusion fixed again

main.py

@@ -501,22 +501,37 @@ class Geometry:
         return math.sqrt((p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2)
 
     def extrude_shape(self, points, length: float, angle, normal, centroid, symet: bool = True, invert: bool = False):
-        """2D to 3D sdf always first"""
+        """
+        Extrude a 2D shape into 3D, orient it along the normal, and position it relative to the centroid.
+        """
+        # Normalize the normal vector
+        normal = np.array(normal)
+        normal = normal / np.linalg.norm(normal)
+
+        # Create the 2D shape
         f = polygon(points)
+
+        # Extrude the shape along the Z-axis
         f = f.extrude(length)
 
-        # Calculate the offset vector (half the length in the direction of the normal)
-        offset = [n * (length / 2) for n in normal]
+        # Center the shape along its extrusion axis
+        f = f.translate((0, 0, length / 2))
 
-        # Apply the offset in the direction of the normal
-        f = f.translate(offset)
-
-        # Apply the centroid translation
-        #f = f.translate(centroid)
-
-        # Apply the orientation
+        # Orient the shape along the normal vector
         f = f.orient(normal)
 
+        # Calculate the current center of the shape
+        shape_center = [0,0,0]
+
+        # Calculate the vector from the shape's center to the centroid
+        center_to_centroid = np.array(centroid) - np.array(shape_center)
+
+        # Project this vector onto the normal to get the required translation along the normal
+        translation_along_normal = np.dot(center_to_centroid, normal) * normal
+
+        # Translate the shape along the normal
+        f = f.translate(translation_along_normal)
+
         return f
 
     def mirror_body(self, sdf_object3d):