occ.md

title
OCC (Open CASCADE)

OCCT (Open CASCADE Technology)

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pythonocc-core

Install with conda

安装 conda：

wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh
chmod 755 Miniconda3-latest-Linux-x86_64.sh
./Miniconda3-latest-Linux-x86_64.sh
# 根据提示，输入 yes 或 ENTER
# 安装完成后，需重启 shell，以更新环境变量

安装 pythonocc：

conda create --name=pyoccenv
source activate pyoccenv
conda install -c conda-forge pythonocc-core

典型用例

读取 STEP 文件

from OCC.Core.STEPControl import STEPControl_Reader

def get_one_shape_from_cad(step_file: str):
    step_reader = STEPControl_Reader()
    status = step_reader.ReadFile(step_file)
    if status != 1:
        raise Exception("Error reading STEP file.")
    step_reader.TransferRoots()
    one_shape = step_reader.OneShape()
    return one_shape

查询最近点

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeVertex
from OCC.Core.BRepExtrema import BRepExtrema_DistShapeShape
from OCC.Core.gp import gp_Pnt

def get_nearest_point(x: float, y: float, z: float, shape: TopoDS_Shape) -> tuple[float, float, float]:
    vertex = BRepBuilderAPI_MakeVertex(gp_Pnt(x, y, z)).Vertex()
    dist_shape_shape = BRepExtrema_DistShapeShape(vertex, shape)
    dist_shape_shape.Perform()
    point_on_shape = dist_shape_shape.PointOnShape2(1)
    distance = dist_shape_shape.Value()
    x, y, z = point_on_shape.X(), point_on_shape.Y(), point_on_shape.Z()
    return x, y, z, distance