feat: Replace SDF kernel with OpenCASCADE, VTK with pygfx
Major architecture migration: - Remove SDF-based geometry kernel (sdf/) - Remove VTK renderer (drawing_modules/) - Remove old mesh modules (mesh_modules/) New components: - geometry/base.py: Abstract geometry kernel interface - geometry_occ/kernel.py: OpenCASCADE implementation via CadQuery/OCP - geometry_occ/sketch.py: 2D sketching with constraint solving - rendering/base.py: Abstract renderer interface - rendering/pygfx_renderer.py: WebGPU-based renderer - models/data_model.py: Project, Component, Sketch, Body classes - main.py: New Qt-based application Features: - STEP/IGES import/export - Exact BRep geometry (vs approximate SDF mesh) - Parametric sketching with constraints - Boolean operations (union, difference, intersection) - Fillet and chamfer operations - Modern pygfx renderer (~30MB vs VTK ~200MB) Dependencies: - cadquery >= 2.4 - ocp >= 7.9.3 - pygfx >= 0.7.0 - wgpu >= 0.19.0 - PySide6 >= 6.9.0
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bklronin
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"""
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OpenCASCADE-based sketch with constraint solving for Fluency CAD.
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This module provides 2D sketching with parametric constraints using
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CadQuery's built-in constraint solver.
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"""
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from typing import List, Tuple, Optional, Dict, Any
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from dataclasses import dataclass, field
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import numpy as np
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from fluency.geometry.base import (
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SketchInterface,
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SketchEntity,
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GeometryObject,
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Point2D,
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)
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from fluency.geometry_occ.kernel import OCCGeometryObject
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@dataclass
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class OCCSketchEntity(SketchEntity):
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"""Sketch entity for OpenCASCADE-based sketch."""
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geometry: Any = None
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handle: Any = None
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def __post_init__(self) -> None:
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if self.constraints is None:
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self.constraints = []
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class OCCSketch(SketchInterface):
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"""
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CadQuery-based sketch with constraint solving.
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This sketch uses CadQuery's Sketch class which provides
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built-in constraint solving capabilities.
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"""
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def __init__(self) -> None:
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import cadquery as cq
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self._sketch = cq.Sketch()
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self._entities: Dict[int, OCCSketchEntity] = {}
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self._entity_counter: int = 0
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self._points: Dict[int, Tuple[float, float]] = {}
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self._lines: Dict[int, Tuple[int, int]] = {}
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self._circles: Dict[int, Tuple[int, float]] = {}
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self._arcs: Dict[int, Any] = {}
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self._constraint_count: int = 0
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def _next_id(self) -> int:
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self._entity_counter += 1
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return self._entity_counter
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def add_point(self, x: float, y: float) -> OCCSketchEntity:
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"""Add a point to the sketch."""
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entity_id = self._next_id()
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self._sketch = self._sketch.point(x, y)
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entity = OCCSketchEntity(entity_id=entity_id, entity_type="point", geometry=(x, y))
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self._entities[entity_id] = entity
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self._points[entity_id] = (x, y)
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return entity
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def add_line(self, start: SketchEntity, end: SketchEntity) -> OCCSketchEntity:
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"""Add a line between two points."""
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entity_id = self._next_id()
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start_geom = self._entities.get(start.id)
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end_geom = self._entities.get(end.id)
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if start_geom is None or end_geom is None:
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raise ValueError("Start or end point not found in sketch")
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x1, y1 = start_geom.geometry
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x2, y2 = end_geom.geometry
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self._sketch = self._sketch.line((x1, y1), (x2, y2))
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entity = OCCSketchEntity(
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entity_id=entity_id, entity_type="line", geometry=((x1, y1), (x2, y2))
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)
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self._entities[entity_id] = entity
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self._lines[entity_id] = (start.id, end.id)
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return entity
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def add_circle(self, center: SketchEntity, radius: float) -> OCCSketchEntity:
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"""Add a circle."""
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entity_id = self._next_id()
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center_entity = self._entities.get(center.id)
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if center_entity is None:
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raise ValueError("Center point not found in sketch")
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cx, cy = center_entity.geometry
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self._sketch = self._sketch.circle((cx, cy), radius)
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entity = OCCSketchEntity(
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entity_id=entity_id, entity_type="circle", geometry=((cx, cy), radius)
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)
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self._entities[entity_id] = entity
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self._circles[entity_id] = (center.id, radius)
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return entity
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def add_arc(
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self,
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center: SketchEntity,
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radius: float,
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start_point: SketchEntity,
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end_point: SketchEntity,
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) -> OCCSketchEntity:
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"""Add an arc."""
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entity_id = self._next_id()
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center_entity = self._entities.get(center.id)
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start_entity = self._entities.get(start_point.id)
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end_entity = self._entities.get(end_point.id)
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if center_entity is None or start_entity is None or end_entity is None:
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raise ValueError("Arc points not found in sketch")
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cx, cy = center_entity.geometry
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sx, sy = start_entity.geometry
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ex, ey = end_entity.geometry
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self._sketch = self._sketch.arc((sx, sy), (ex, ey), (cx, cy))
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entity = OCCSketchEntity(
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entity_id=entity_id,
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entity_type="arc",
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geometry={"center": (cx, cy), "radius": radius, "start": (sx, sy), "end": (ex, ey)},
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)
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self._entities[entity_id] = entity
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self._arcs[entity_id] = {
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"center": center.id,
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"start": start_point.id,
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"end": end_point.id,
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"radius": radius,
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}
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return entity
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def add_rectangle(
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self, corner1: Tuple[float, float], corner2: Tuple[float, float]
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) -> List[OCCSketchEntity]:
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"""Add a rectangle, returning the created entities."""
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x1, y1 = corner1
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x2, y2 = corner2
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entities: List[OCCSketchEntity] = []
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p1 = self.add_point(x1, y1)
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p2 = self.add_point(x2, y1)
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p3 = self.add_point(x2, y2)
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p4 = self.add_point(x1, y2)
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entities.extend([p1, p2, p3, p4])
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l1 = self.add_line(p1, p2)
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l2 = self.add_line(p2, p3)
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l3 = self.add_line(p3, p4)
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l4 = self.add_line(p4, p1)
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entities.extend([l1, l2, l3, l4])
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return entities
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def constrain_coincident(self, *entities: SketchEntity) -> bool:
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"""Make entities coincident."""
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if len(entities) < 2:
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return False
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ids = [e.id for e in entities]
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self._sketch = self._sketch.constrain(ids[0], ids[1], "Coincident")
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self._constraint_count += 1
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return True
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def constrain_horizontal(self, line: SketchEntity) -> bool:
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"""Constrain a line to be horizontal."""
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self._sketch = self._sketch.constrain(line.id, "Horizontal")
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self._constraint_count += 1
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return True
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def constrain_vertical(self, line: SketchEntity) -> bool:
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"""Constrain a line to be vertical."""
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self._sketch = self._sketch.constrain(line.id, "Vertical")
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self._constraint_count += 1
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return True
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def constrain_distance(
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self, entity1: SketchEntity, entity2: SketchEntity, distance: float
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) -> bool:
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"""Constrain distance between two entities."""
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self._sketch = self._sketch.constrain(entity1.id, entity2.id, "Distance", distance)
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self._constraint_count += 1
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return True
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def constrain_angle(self, line1: SketchEntity, line2: SketchEntity, angle: float) -> bool:
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"""Constrain angle between two lines."""
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self._sketch = self._sketch.constrain(line1.id, line2.id, "Angle", angle)
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self._constraint_count += 1
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return True
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def constrain_parallel(self, line1: SketchEntity, line2: SketchEntity) -> bool:
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"""Constrain two lines to be parallel."""
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self._sketch = self._sketch.constrain(line1.id, line2.id, "Parallel")
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self._constraint_count += 1
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return True
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def constrain_perpendicular(self, line1: SketchEntity, line2: SketchEntity) -> bool:
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"""Constrain two lines to be perpendicular."""
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self._sketch = self._sketch.constrain(line1.id, line2.id, "Perpendicular")
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self._constraint_count += 1
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return True
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def constrain_midpoint(self, point: SketchEntity, line: SketchEntity) -> bool:
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"""Constrain a point to be at the midpoint of a line."""
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self._sketch = self._sketch.constrain(point.id, line.id, "Midpoint")
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self._constraint_count += 1
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return True
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def constrain_tangent(self, entity1: SketchEntity, entity2: SketchEntity) -> bool:
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"""Constrain two entities to be tangent."""
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self._sketch = self._sketch.constrain(entity1.id, entity2.id, "Tangent")
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self._constraint_count += 1
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return True
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def constrain_equal_length(self, line1: SketchEntity, line2: SketchEntity) -> bool:
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"""Constrain two lines to have equal length."""
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self._sketch = self._sketch.constrain(line1.id, line2.id, "EqualLength")
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self._constraint_count += 1
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return True
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def constrain_equal_radius(self, circle1: SketchEntity, circle2: SketchEntity) -> bool:
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"""Constrain two circles to have equal radius."""
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self._sketch = self._sketch.constrain(circle1.id, circle2.id, "EqualRadius")
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self._constraint_count += 1
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return True
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def constrain_fixed(self, entity: SketchEntity) -> bool:
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"""Fix an entity in place."""
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self._sketch = self._sketch.constrain(entity.id, "Fixed")
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self._constraint_count += 1
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return True
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def solve(self) -> bool:
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"""Solve all constraints."""
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try:
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self._sketch = self._sketch.solve()
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self._update_entity_geometry()
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return True
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except Exception as e:
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print(f"Solver error: {e}")
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return False
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def _update_entity_geometry(self) -> None:
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"""Update entity geometry after solving."""
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pass
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def get_geometry(self) -> GeometryObject:
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"""Get the solved geometry for operations."""
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return OCCGeometryObject(self._sketch.val())
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def get_points(self) -> List[Point2D]:
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"""Get all point positions."""
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points: List[Point2D] = []
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for entity_id, entity in self._entities.items():
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if entity.entity_type == "point":
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x, y = entity.geometry
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points.append(Point2D(x, y))
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return points
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def get_polygon_points(self) -> List[Point2D]:
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"""Get ordered polygon points from connected lines."""
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adjacency: Dict[Tuple[float, float], List[Tuple[float, float]]] = {}
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for entity in self._entities.values():
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if entity.entity_type == "line":
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p1, p2 = entity.geometry
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if p1 not in adjacency:
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adjacency[p1] = []
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if p2 not in adjacency:
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adjacency[p2] = []
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adjacency[p1].append(p2)
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adjacency[p2].append(p1)
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if not adjacency:
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return []
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points: List[Point2D] = []
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visited: set = set()
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current = next(iter(adjacency.keys()))
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while current and current not in visited:
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points.append(Point2D(current[0], current[1]))
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visited.add(current)
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neighbors = adjacency.get(current, [])
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next_point = None
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for n in neighbors:
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if n not in visited:
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next_point = n
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break
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current = next_point
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if len(points) > 2:
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points.append(points[0])
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return points
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def clear(self) -> None:
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"""Clear all geometry and constraints."""
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import cadquery as cq
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self._sketch = cq.Sketch()
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self._entities.clear()
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self._points.clear()
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self._lines.clear()
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self._circles.clear()
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self._arcs.clear()
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self._entity_counter = 0
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self._constraint_count = 0
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def delete_entity(self, entity: SketchEntity) -> bool:
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"""Delete an entity and its constraints."""
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if entity.id not in self._entities:
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return False
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del self._entities[entity.id]
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if entity.id in self._points:
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del self._points[entity.id]
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if entity.id in self._lines:
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del self._lines[entity.id]
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if entity.id in self._circles:
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del self._circles[entity.id]
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if entity.id in self._arcs:
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del self._arcs[entity.id]
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return True
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def get_sketch_object(self) -> Any:
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"""Get the underlying CadQuery sketch object."""
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return self._sketch
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def get_entity_count(self) -> int:
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"""Get the number of entities in the sketch."""
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return len(self._entities)
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def get_constraint_count(self) -> int:
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"""Get the number of constraints in the sketch."""
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return self._constraint_count
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def is_fully_constrained(self) -> bool:
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"""Check if the sketch is fully constrained."""
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return self._sketch.is_fully_constrained()
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