Creating a 3D B-Spline Surface and Extruded Solid with PythonOCC

Image
In the realm of 3D computer graphics and CAD (Computer-Aided Design), Python, combined with the Open CASCADE Technology (OCC) library, offers powerful tools for creating and manipulating complex geometries. One such application is the creation of a 3D B-spline surface, a versatile type of surface that can be used in various design and engineering tasks. This article will guide you through the process of creating a 3D B-spline surface using Python and OCC. Setting Up the Environment First, ensure you have the OCC library installed. This library provides the necessary tools for working with 3D geometries in Python. Our code begins with importing the required modules from the OCC library: from OCC.Core.gp import gp_Pnt, gp_Vec from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeFace from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakePrism from OCC.Core.GeomAPI import GeomAPI_PointsToBSplineSurface from OCC.Core.TColgp import TColgp_Array2OfPnt Defining Control Points ...
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Creating a 3D prism using PythonOCC

 

Introduction

In this tutorial, we'll delve into 3D modeling with OpenCASCADE Technology (OCC), a comprehensive CAD/CAM/CAE kernel and development platform. We will create a 3D prism based on a custom wireframe shape.

Preparing the Environment

Ensure you have the OCC library installed in your Python environment. This tutorial uses PythonOCC for its Python bindings to the OCC library.

Step-by-Step Code Explanation

Importing Necessary Modules

We import classes for creating points (gp_Pnt), vectors (gp_Vec), polygons, faces, and prisms. init_display is for visualizing our 3D model. /div> Defining the Wireframe Points 

point_list = [
    gp_Pnt(0, 0, 0),
    gp_Pnt(0, 10, 0),
    gp_Pnt(3, 28, 0),
    gp_Pnt(10, 10, 0),
    gp_Pnt(10, 0, 0),
    gp_Pnt(0, 0, 0)
]
We define a list of points that will form our custom wireframe shape. These points will be connected in sequence to create a closed loop. Building the Wireframe Polygon 

polygon_builder = BRepBuilderAPI_MakePolygon()
for point in point_list:
    polygon_builder.Add(point)
polygon = polygon_builder.Wire()






We iterate through the point list, adding each point to the BRepBuilderAPI_MakePolygon object. The result is a wireframe polygon.


Creating a Face from the Polygon



face_builder = BRepBuilderAPI_MakeFace(polygon, True)
face = face_builder.Face()



Using BRepBuilderAPI_MakeFace, we convert the wireframe polygon into a face. The face is a 2D shape that will form the base of our prism.


Building the Prism



height = 2.0  # The height of the prism
prism_builder = BRepPrimAPI_MakePrism(face, gp_Vec(0, 0, height))
solid = prism_builder.Shape()



We define the height of the prism and use BRepPrimAPI_MakePrism to extrude the face along the Z-axis, forming a 3D solid prism.


Setting Up and Running the Display



display, start_display, add_menu, add_function_to_menu = init_display()
display.DisplayShape(solid, update=True)
display.FitAll()
start_display()



These lines initialize the display window, render the prism, and start the GUI loop, allowing us to view our 3D model.


Result





Conclusion


This script demonstrates the creation of a 3D prism from a custom wireframe shape using Python and OCC. It's an excellent foundation for more advanced 3D modeling and CAD tasks.


Next Steps


Experiment with different shapes, explore transformations, or learn how to export your models to various file formats.

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