feat(modeling): implement 3D parametric solid and rebar modeling engines

exporters.py

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+def _get_solid_objects(model_data):
+    """Safely extracts unique 3D concrete solid meshes from model_data['objects']."""
+    objs = []
+    seen = set()
+    raw = model_data.get('objects', {})
+    if 'culvert' in raw and isinstance(raw['culvert'], dict):
+        c = raw['culvert']
+        objs.append(c)
+        seen.add(c.get('id', 'CULVERT'))
+    if 'wingwalls' in raw and isinstance(raw['wingwalls'], list):
+        for w in raw['wingwalls']:
+            if isinstance(w, dict) and w.get('id') not in seen and 'vertices' in w:
+                objs.append(w)
+                seen.add(w['id'])
+    else:
+        for k, v in raw.items():
+            if isinstance(v, dict) and v.get('id') and v['id'] not in seen and 'vertices' in v:
+                objs.append(v)
+                seen.add(v['id'])
+    return objs
+
+
+def export_obj(model_data, include_rebars=True):
+    """
+    Exports 3D model data (exterior concrete solids + 3D rebars) to Wavefront OBJ format.
+    """
+    lines = ["# Wingwall & Culvert 3D Solid & Rebar Model", "# Generated by Antigravity CAD/BIM Modeler", ""]
+    v_offset = 1
+
+    solid_objects = _get_solid_objects(model_data)
+    for obj in solid_objects:
+        lines.append(f"o {obj['id']}")
+        lines.append(f"g {obj['name']}")
+
+        for v in obj['vertices']:
+            lines.append(f"v {v[0]:.4f} {v[1]:.4f} {v[2]:.4f}")
+
+        for f in obj['faces']:
+            lines.append(f"f {f[0] + v_offset} {f[1] + v_offset} {f[2] + v_offset}")
+
+        v_offset += len(obj['vertices'])
+        lines.append("")
+
+    if include_rebars and 'rebars' in model_data:
+        for ww_id, ww_rebar in model_data['rebars'].get('wingwalls', {}).items():
+            for grp in ww_rebar.get('groups', []):
+                lines.append(f"o REBAR_{ww_id}_{grp['mark']}_{grp['dia']}")
+                for poly in grp.get('polylines', []):
+                    if len(poly) < 2:
+                        continue
+                    for pt in poly:
+                        lines.append(f"v {pt[0]:.4f} {pt[1]:.4f} {pt[2]:.4f}")
+                    idx_str = " ".join(str(v_offset + i) for i in range(len(poly)))
+                    lines.append(f"l {idx_str}")
+                    v_offset += len(poly)
+                lines.append("")
+
+    return "\n".join(lines)
+
+
+def export_stl(model_data):
+    """
+    Exports 3D model data to ASCII STL format.
+    """
+    lines = ["solid WingwallCulvertModel"]
+    for obj in _get_solid_objects(model_data):
+        v = obj['vertices']
+        for f in obj['faces']:
+            p1 = v[f[0]]
+            p2 = v[f[1]]
+            p3 = v[f[2]]
+            v1 = [p2[0]-p1[0], p2[1]-p1[1], p2[2]-p1[2]]
+            v2 = [p3[0]-p1[0], p3[1]-p1[1], p3[2]-p1[2]]
+            nx = v1[1]*v2[2] - v1[2]*v2[1]
+            ny = v1[2]*v2[0] - v1[0]*v2[2]
+            nz = v1[0]*v2[1] - v1[1]*v2[0]
+            mag = (nx*nx + ny*ny + nz*nz)**0.5
+            if mag > 1e-8:
+                nx, ny, nz = nx/mag, ny/mag, nz/mag
+            else:
+                nx, ny, nz = 0.0, 0.0, 1.0
+
+            lines.append(f"  facet normal {nx:.4e} {ny:.4e} {nz:.4e}")
+            lines.append("    outer loop")
+            lines.append(f"      vertex {p1[0]:.4f} {p1[1]:.4f} {p1[2]:.4f}")
+            lines.append(f"      vertex {p2[0]:.4f} {p2[1]:.4f} {p2[2]:.4f}")
+            lines.append(f"      vertex {p3[0]:.4f} {p3[1]:.4f} {p3[2]:.4f}")
+            lines.append("    endloop")
+            lines.append("  endfacet")
+    lines.append("endsolid WingwallCulvertModel")
+    return "\n".join(lines)
+
+
+def export_dxf_3d(model_data, include_rebars=True):
+    """
+    Exports 3D model data to DXF R2000 ASCII format containing 3DFACE entities for concrete
+    and 3D LINE entities for internal rebars.
+    """
+    lines = [
+        "0", "SECTION",
+        "2", "ENTITIES"
+    ]
+    for obj in _get_solid_objects(model_data):
+        layer = obj['id']
+        v = obj['vertices']
+        for f in obj['faces']:
+            p1 = v[f[0]]
+            p2 = v[f[1]]
+            p3 = v[f[2]]
+            lines.extend([
+                "0", "3DFACE",
+                "8", layer,
+                "10", f"{p1[0]:.4f}", "20", f"{p1[1]:.4f}", "30", f"{p1[2]:.4f}",
+                "11", f"{p2[0]:.4f}", "21", f"{p2[1]:.4f}", "31", f"{p2[2]:.4f}",
+                "12", f"{p3[0]:.4f}", "22", f"{p3[1]:.4f}", "32", f"{p3[2]:.4f}",
+                "13", f"{p3[0]:.4f}", "23", f"{p3[1]:.4f}", "33", f"{p3[2]:.4f}"
+            ])
+
+    if include_rebars and 'rebars' in model_data:
+        color_by_dia = {'H19': '1', 'H16': '4', 'H13': '3'}
+        for ww_id, ww_rebar in model_data['rebars'].get('wingwalls', {}).items():
+            for grp in ww_rebar.get('groups', []):
+                layer = f"REBAR_{ww_id}_{grp['mark']}_{grp['dia']}"
+                c_code = color_by_dia.get(grp['dia'], '2')
+                for poly in grp.get('polylines', []):
+                    for i in range(len(poly) - 1):
+                        p1 = poly[i]
+                        p2 = poly[i + 1]
+                        lines.extend([
+                            "0", "LINE",
+                            "8", layer,
+                            "62", c_code,
+                            "10", f"{p1[0]:.4f}", "20", f"{p1[1]:.4f}", "30", f"{p1[2]:.4f}",
+                            "11", f"{p2[0]:.4f}", "21", f"{p2[1]:.4f}", "31", f"{p2[2]:.4f}"
+                        ])
+
+    lines.extend([
+        "0", "ENDSEC",
+        "0", "EOF"
+    ])
+    return "\n".join(lines)
+
+
+def export_rebar_bom_csv(model_data):
+    """
+    Exports 3단계 철근 재료표 (Bar Bending Schedule) to UTF-8 BOM CSV format.
+    """
+    rows = [
+        "\ufeff구분(날개벽),기호(Mark),직경(Dia),배치부위,역할,간격,절곡치수,1본길이(m),수량(개),총길이(m),단위중량(kg/m),총중량(TON)"
+    ]
+    if 'rebars' in model_data:
+        for ww_id, ww in model_data['rebars'].get('wingwalls', {}).items():
+            ww_name = ww.get('wingwall_name', ww_id)
+            for g in ww.get('groups', []):
+                shape_str = " / ".join(f"{k}={v}" for k, v in g.get('shape_params', {}).items())
+                rows.append(
+                    f'"{ww_name}",{g["mark"]},{g["dia"]},"{g["zone"]}","{g["role"]}","{g["spacing"]}",'
+                    f'"{shape_str}",{g["length_m"]:.3f},{g["count"]},{g["total_length_m"]:.3f},'
+                    f'{g["unit_weight"]:.3f},{g["weight_ton"]:.4f}'
+                )
+            s = ww.get('summary', {})
+            rows.append(
+                f'"{ww_name} 소계",-,전체,-,-,-,-,-,{s.get("total_bars",0)},'
+                f'{s.get("total_length_m",0):.3f},-,{s.get("total_weight_ton",0):.3f} (할증3%: {s.get("total_surcharge_ton",0):.3f})'
+            )
+    return "\n".join(rows)