Member properties Dynamic girder fixes

src/osdagbridge/core/bridge_types/plate_girder/analyser.py

@@ -1,4 +1,9 @@
-import ospgrillage as og
+HAS_OSP_GRILLAGE = True
+try:
+    import ospgrillage as og
+except (ImportError, ModuleNotFoundError):
+    HAS_OSP_GRILLAGE = False
+
 # from math import sqrt, pi
 # import openseespy.opensees as ops
 from osdagbridge.core.utils.codes.irc6_2017 import IRC6_2017

src/osdagbridge/core/bridge_types/plate_girder/analysis_results.py

@@ -134,7 +134,13 @@
 
 import math
 from collections import defaultdict, deque
-import openseespy.opensees as ops
+
+HAS_OPENSEES = True
+try:
+    import openseespy.opensees as ops
+except (ImportError, ModuleNotFoundError):
+    HAS_OPENSEES = False
+
 import pandas as pd
 from osdagbridge.core.utils.common import kN, m, m2
 from osdagbridge.core.utils.codes.irc6_2017 import IRC6_2017

src/osdagbridge/core/bridge_types/plate_girder/plot_generator.py

@@ -7,7 +7,13 @@
 from matplotlib.ticker import FuncFormatter
 from matplotlib.ticker import MaxNLocator
 import numpy as np
-import openseespy.opensees as ops
+
+HAS_OPENSEES = True
+try:
+    import openseespy.opensees as ops
+except (ImportError, ModuleNotFoundError):
+    HAS_OPENSEES = False
+
 from mpl_toolkits.mplot3d.art3d import Line3DCollection
 
 try:

src/osdagbridge/desktop/ui/cad_3d.py

@@ -19,16 +19,20 @@
 )
 from PySide6.QtCore import QTimer, Qt
 
-from OCC.Core.Quantity import Quantity_Color, Quantity_TOC_RGB
-from OCC.Display.backend import load_backend
-
-# CAD generator
-from osdagbridge.core.bridge_types.plate_girder.cad_generator import (
-    PlateGirderCADGenerator
-)
+HAS_OCC = True
+try:
+    from OCC.Core.Quantity import Quantity_Color, Quantity_TOC_RGB
+    from OCC.Display.backend import load_backend
+
+    # CAD generator
+    from osdagbridge.core.bridge_types.plate_girder.cad_generator import (
+        PlateGirderCADGenerator
+    )
 
-# Custom 3D Viewer 
-from osdagbridge.desktop.ui.utils.custom_3dviewer import CustomViewer3d
+    # Custom 3D Viewer 
+    from osdagbridge.desktop.ui.utils.custom_3dviewer import CustomViewer3d
+except (ImportError, ModuleNotFoundError) as e:
+    HAS_OCC = False
 
 from osdagbridge.core.bridge_types.plate_girder.dto import (
     BridgeParametersDTO,
@@ -46,6 +50,23 @@ class CAD3DWindow(QWidget):
     def __init__(self, parent=None):
         super().__init__(parent)
 
+        if not HAS_OCC:
+            from PySide6.QtWidgets import QLabel
+            self.layout = QVBoxLayout(self)
+            self.layout.setAlignment(Qt.AlignCenter)
+
+            self.label = QLabel(
+                "<h3>3D CAD Viewer Unavailable</h3>"
+                "<p>The 3D viewer requires <b>pythonocc-core</b>, which is not installed in your Python environment.</p>"
+                "<p>To enable 3D viewing, please install it via conda:<br>"
+                "<code>conda install -c conda-forge pythonocc-core=7.6.2</code></p>"
+            )
+            self.label.setTextFormat(Qt.RichText)
+            self.label.setAlignment(Qt.AlignCenter)
+            self.label.setStyleSheet("color: #555555; font-size: 14px; padding: 20px; border: 1px solid #cccccc; border-radius: 8px; background-color: #fafafa;")
+            self.layout.addWidget(self.label)
+            return
+
         # CAD generator
         self.generator = PlateGirderCADGenerator()
 
@@ -77,6 +98,8 @@ def init_display(self):
         Does NOT generate or render any geometry.
         Call render_3d_cad() to render the model.
         """
+        if not HAS_OCC:
+            return
         load_backend("pyside6")
 
         self.viewer = CustomViewer3d(self)
@@ -112,6 +135,8 @@ def _complete_cad_init(self):
         self.create_cad_view_controls()
 
     def _is_display_ready(self):
+        if not HAS_OCC:
+            return False
         return self.display is not None and not self._cad_init_pending
 
     # ── RENDER / CLEAR ────────────────────────────────────────────────────────

src/osdagbridge/desktop/ui/dialogs/additional_inputs.py

@@ -227,6 +227,10 @@ def init_ui(self):
         # Keep girder count in sync across tabs
         try:
             self.typical_section_tab.girder_count_changed.connect(self.section_properties_tab.set_girder_count)
+            if hasattr(self.typical_section_tab, "cad_params_changed") and hasattr(self.section_properties_tab, "update_cad_params"):
+                self.typical_section_tab.cad_params_changed.connect(self.section_properties_tab.update_cad_params)
+                if hasattr(self, "_initial_cad_state") and self._initial_cad_state:
+                    self.typical_section_tab.cad_params_changed.emit(self._initial_cad_state)
             self._sync_member_properties_girder_count()
         except Exception:
             pass