feat: initial otko import

tests/gui/test_section_extrusion.py

@@ -0,0 +1,77 @@
+"""Smoke tests for the Show Extruded Sections overlay."""
+
+from __future__ import annotations
+
+import pytest
+
+pytest.importorskip("PySide6")
+
+from otko.core import (  # noqa: E402
+    ElasticBeamColumn,
+    ElasticSection,
+    Node,
+    Project,
+)
+
+
+def _frame_project() -> Project:
+    # Rectangular section 0.3×0.5 m.
+    b, h = 0.30, 0.50
+    A = b * h
+    Iz = b * h ** 3 / 12.0
+    Iy = h * b ** 3 / 12.0
+    return Project(
+        nodes=[
+            Node(id=1, coords=(0.0, 0.0, 0.0),
+                 restraint=(True, True, True, True, True, True)),
+            Node(id=2, coords=(6.0, 0.0, 0.0)),
+        ],
+        sections=[ElasticSection(
+            id=1, name="Rect", E=200e9, A=A,
+            Iz=Iz, Iy=Iy, G=80e9, J=1e-6,
+        )],
+        elements=[
+            ElasticBeamColumn(id=1, nodes=(1, 2), section_id=1),
+        ],
+    )
+
+
+@pytest.mark.gui
+def test_toggle_creates_and_removes_extrusion_actor(qtbot) -> None:  # type: ignore[no-untyped-def]
+    from otko.views.canvas3d.model_canvas import ModelCanvas
+    canvas = ModelCanvas()
+    qtbot.addWidget(canvas)
+    canvas.show_project(_frame_project())
+
+    before = len(canvas._renderer._aux_actors)
+    canvas.set_show_section_extrusions(True)
+    after_on = len(canvas._renderer._aux_actors)
+    assert after_on > before, "Extrusion actor should appear after toggling on"
+
+    canvas.set_show_section_extrusions(False)
+    after_off = len(canvas._renderer._aux_actors)
+    assert after_off == before, "Extrusion actor must disappear when toggled off"
+
+
+@pytest.mark.gui
+def test_extrusion_skips_elements_without_section(qtbot) -> None:  # type: ignore[no-untyped-def]
+    """A truss element has no section — it must be skipped silently."""
+    from otko.core import ElasticUniaxial, TrussElement
+    from otko.views.canvas3d.model_canvas import ModelCanvas
+    canvas = ModelCanvas()
+    qtbot.addWidget(canvas)
+    p = Project(
+        nodes=[
+            Node(id=1, coords=(0, 0, 0), restraint=(True, True, True, True, True, True)),
+            Node(id=2, coords=(3, 0, 0)),
+        ],
+        materials=[ElasticUniaxial(id=1, E=200e9)],
+        elements=[
+            TrussElement(id=1, nodes=(1, 2), area=1e-3, material_id=1),
+        ],
+    )
+    canvas.show_project(p)
+    canvas.set_show_section_extrusions(True)
+    # No crash, no extra actor (truss has no section_id).
+    # (Other aux actors like the grid might exist; only verify nothing blew up.)
+    assert canvas._renderer._aux_actors is not None