The last step consists in defining the segment, which is the same for the two profiles: a line limited by the first and the last point of one of the arcs. In Open CASCADE Technology a package is a group of classes providing related functionality. In U parameter: between 0 and 2PI for the angle description. This is because the GC provides two algorithm classes which are exactly what is required for our profile: Both of these classes return a Geom_TrimmedCurve manipulated by handle. Open CASCADE notes A blog about the Open Source 3D modeling kernel : notes from its former developer and project manager How to import SOLIDWORKS (or Parasolid, JT, NX, Creo) files into Open CASCADE Your bottle is complete. You have already used the Geom package to define 3D geometric entities. The thickness between the two walls W1 and W2 (distance D). The most commonly used methods of this class are: As you can see, the BRep_Tool::Surface method returns an instance of the Geom_Surface class manipulated by handle. Now, you can create the two profiles of the threading, lying on each surface. This can be done by using the topological data structure of Open CASCADE Technology defined in the TopoDS package: it defines relationships between geometric entities which can be linked together to represent complex shapes. Among them is the BRepPrimAPI_MakePrism class. Welcome to an object detection tutorial with OpenCV and Python. the coordinate system where the cylinder will be located; Remove one or more faces from the initial solid to obtain the first wall W1 of the hollowed solid. The Geom package implements 3D geometric objects: elementary curves and surfaces are provided as well as more complex ones (such as Bezier and BSpline). Open CASCADE has a pretty good tutorial on their web site. The first way is to define it from scratch, using its geometric definition: The second and simplest way is to use the geometric constants defined in the gp package (origin, main directions and axis of the global coordinate system). The last step consists in defining the segment, which is the same for the two profiles: a line limited by the first and the last point of one of the arcs. OccTutorial This repository contains a set of tutorials for OpenCASCADE, the open source geometry kernel. But, since a cylindrical surface is U periodic, you can decide to extend this angle evolution to 4PI as shown in the following drawing: A center located in the middle of the neck's cylinder parametric space at (2*PI, myNeckHeight / 2) in U, V coordinates. There are two ways of building a wire with this class: When building a wire from less than four edges, as in the present case, you can use the constructor directly as follows: Once the first part of your wire is created you need to compute the complete profile. add the reflected wire to the initial one. For example, to get the X coordinate of a point: With the help of the previously defined points, you can compute a part of the bottle's profile geometry. One possibility is to create an edge directly from two points, in which case the underlying geometry of this edge is a line, bounded by two vertices being automatically computed from the two input points. Its full details are given here: Cascade Classifier Training. a vector for a finite prism or a direction for finite and infinite prisms. To align the neck with the center of the top face, being in the global coordinate system (0, 0, myHeight), with its normal on the global Z axis, your local coordinate system can be defined as follows: To create a cylinder, use another class from the primitives construction package: the BRepPrimAPI_MakeCylinder class. To create a face, use the BRepBuilderAPI_MakeFace class. If you want to know more and develop major projects using Open CASCADE Technology, we invite you to study our training, support, and consulting services on our site at https://www.opencascade.com/content/technology-support. In the following figure, curves on the left define the base (on aCyl1 surface) and the curves on the right define the top of the thread's shape (on aCyl2 surface). To create a face, use the BRepBuilderAPI_MakeFace class. Part of a surface bounded by a closed wire(s). In this tutorial, you will be shown how to create your very own Haar Cascades, so you can track any object you want. However, the Geom_Surface class does not provide information about the real type of the object aSurface, which could be an instance of Geom_Plane, Geom_CylindricalSurface, etc. This kind of functionality is provided with the TopExp_Explorer class, which explores the data structure described in a TopoDS_Shape and extracts the sub-shapes you specifically need. There are two ways of building a wire with this class: When building a wire from less than four edges, as in the present case, you can use the constructor directly as follows: Once the first part of your wire is created you need to compute the complete profile. add all edges of the two wires by using the. For example, aEdge1 and aEdge3 could have been computed in a simpler way: To connect the edges, you need to create a wire with the BRepBuilderAPI_MakeWire class. In Open CASCADE Technology, a hollowed solid is called a Thick Solid and is internally computed as follows: To compute a thick solid, you create an instance of the BRepOffsetAPI_MakeThickSolid class by giving the following information: The challenging part in this procedure is to find the face to remove from your shape - the top face of the neck, which: To find the face with such characteristics, you will once again use an explorer to iterate on all the bottle's faces to find the appropriate one. In Windows, you can use the cascade windows option to arrange all open windows to overlap one another with their title bars remaining visible so you can quickly see which windows are open to switch to one. There are two ways to define this axis. Suppose that you have these two global variables: You can easily find the plane whose origin is the biggest in Z knowing that the location of the plane is given with the Geom_Plane::Location method. P is the point defined by parameters (U, V). Open CASCADE Technology provides a quick way to do this by building a loft: a shell or a solid passing through a set of wires in a given sequence. This sample demonstrates how to use OCCT libraries in .Net application written using CSharp and Windows Forms or Windows Presentation Foundation (WPF).. ##How are the tutorials organized The series is organized into Chapters, with each chapter focusing on one or two packages of OpenCASCADE. Here we will deal with detection. As the parametric equation of an ellipse is P(U) = O + (MajorRadius * cos(U) * XDirection) + (MinorRadius * sin(U) * YDirection), the ellipses need to be limited between 0 and M_PI. Class names and behaviors are similar to those in GC. You now have all necessary data to apply the transformation with the BRepBuilderAPI_Transform class by specifying: BRepBuilderAPI_Transform does not modify the nature of the shape: the result of the reflected wire remains a wire. There are two different ways to use this class: Since the simplest approach is always the best one, you should use the SetMirror method with the axis as the center of symmetry. A X direction defined with the (2*PI, myNeckHeight/4) vector in U, V coordinates, so that the curves occupy half of the neck's surfaces. In the BRepLib tool package, you can use the BuildCurves3d method to compute 3D curves for all the edges of a shape. Reply Delete. If you want to train your own classifier for any object like car, planes etc. Open CASCADE Technology provides a quick way to do this by building a loft: a shell or a solid passing through a set of wires in a given sequence. Particularly, we will use the functions: 3.1. cv::CascadeClassifier::loadto load a .xml classifier file. This can be a lengthy operation. Lastly, you can build your own very first application. As shown in the figure below, it will consist of two segments and one arc. You can directly instantiate classes belonging to Geom, but it is easier to compute elementary curves and surfaces by using the GC package. We'll do face and eye detection to start. To do this, you use the BRepBuilderAPI_MakeWire class as follows: To compute the main body of the bottle, you need to create a solid shape. P is the point defined by parameters (U, V). This can be done by using the topological data structure of Open CASCADE Technology defined in the TopoDS package: it defines relationships between geometric entities which can be linked together to represent complex shapes. (This is 10x the size of the Open CASCADE tutorial. For example: You have now found the top face of the neck. Our professional services can maximize the power of your Open CASCADE Technology applications. O, *Dir, yDir and zDir are respectively the origin, the X direction, Y direction and Z direction of the cylindrical surface local coordinate system. By default, it can be offered for both individuals and groups of up to 4 trainees. compute the edges of the neck's threading. Once this is done, you perform the last step of the procedure by asking for the filleted shape. Then try out Draw, to test or demonstrate them, and learn how to run the samples. Algorithm classes available to compute standard topological objects can be found in the BRepBuilderAPI package. This coordinate system will be defined with: To use 2D primitive geometry types of Open CASCADE Technology for defining a point and a coordinate system, you will once again instantiate classes from gp: You will now define the curves. We would like to show you a description here but the site won’t allow us. This video demonstrates basic techniques to interactively simplify heavy CAD assemblies using the new technology of OPEN CASCADE. To instantiate a gp_Pnt object, just specify the X, Y, and Z coordinates of the points in the global Cartesian coordinate system: Once your objects are instantiated, you can use methods provided by the class to access and modify its data. has a plane (planar surface) as underlying geometry; is the highest face (in Z coordinates) of the bottle. Class names and behaviors are similar to those in GC. These points will be the supports that define the geometry of the profile. Each one must then be added in the BRepFilletAPI_MakeFillet instance with the Add() method. To create the bottle's profile, you first create characteristic points with their coordinates as shown below in the (XOY) plane. To handle possible errors more explicitly, you may use the IsDone and Value methods. Your bottle is complete. The loft function is implemented in the BRepOffsetAPI_ThruSections class, which you use as follows: You are almost done building the bottle. Both ellipses have the same major radius of 2*PI. The threading will be a solid shape, so you must now compute the faces of the wires, the faces allowing you to join the wires, the shell out of these faces and then the solid itself. Then try out Draw, to test or demonstrate them, and learn how to run the samples. Welcome to OpenCASCADE tutorials! Remember that these wires were built out of a surface and 2D curves. For example: You have now found the top face of the neck. To learn this aspect of Open CASCADE Technology, you will build helicoidal profiles out of 2D curves on cylindrical surfaces. The collection for shapes can be found in the TopTools package. Open Cascade training programs give a complete overview to those who want to become operational with the Open CASCADE Technology or SALOME platform. There are two classes to describe a 3D Cartesian point from its X, Y and Z coordinates in Open CASCADE Technology: A handle is a type of smart pointer that provides automatic memory management. When the wire lies on a plane, the surface is automatically computed. The TopoDS global functions provide this kind of service by casting a shape into its real type. In the following figure, curves on the left define the base (on aCyl1 surface) and the curves on the right define the top of the thread's shape (on aCyl2 surface). The result is a new vertex Vn with 3D point Pn and tolerance value Tol(Vn).. In V parameter: between 0 and myHeighNeck for the height description. The bottle's profile is almost finished. For 2D, you will use the Geom2d package. For example, consider the parametric ranges of the neck's surface: Suppose that you create a 2D line on this parametric (U, V) space and compute its 3D parametric curve. This tutorial assumes that you have experience in using and setting up C++. has a plane (planar surface) as underlying geometry; is the highest face (in Z coordinates) of the bottle. Open Cascade training programs give a complete overview to those who want to become operational with the Open CASCADE Technology or SALOME platform. This tutorial assumes that you have experience in using and setting up C++. It also creates an output file of the geometry in STEP format. To define a 2D point from its X and Y coordinates, use the, To define a 2D direction (unit vector) from its X and Y coordinates, use the, To define a 2D right-handed coordinate system, use the. To add a neck to the bottle, you will create a cylinder and fuse it to the body. Compute a solid from the two walls W1 and W2. If you need to create a quarter of a circle, you create a Geom_TrimmedCurve on C limited between 0 and M_PI/2. The vector, defined with the gp_Vec class on its X, Y and Z coordinates, is: All the necessary data to create the main body of your bottle is now available. On the neck's surface, the evolution laws of this curve will be: In this (U, V) parametric space, you will create a local (X, Y) coordinate system to position the curves to be created. Is there anyone who already worked with Open Cascade and can help me with my Problem? The information you must provide is: You now have two separate parts: a main body and a neck that you need to fuse together. by adding other wire(s) or edge(s) to an existing wire (this is explained later in this tutorial). When creating the bottle's profile, you used classes from the GC package, providing algorithms to create elementary geometries. Description. the shape on which the transformation must be applied. For example, consider the parametric ranges of the neck's surface: Suppose that you create a 2D line on this parametric (U, V) space and compute its 3D parametric curve. To choose the best class for this application, consider the following: Since all the points you will define are only used to create the profile's curves, an object with a limited lifetime will do. However, the Geom package provides only the data structure of geometric entities. To do this, you use the BRepBuilderAPI_MakeWire class as follows: To compute the main body of the bottle, you need to create a solid shape. Three edges out of the previously computed curves. Note that this method will raise an exception if construction has failed. It includes a set of C++ class libraries providing services for 3D surface and solid modeling, CAD data exchange, and visualization. Three edges out of the previously computed curves. As a first step, you compute these cylindrical surfaces. The Prism functionality of Open CASCADE Technology is the most appropriate for that task. The function body is provided in the file samples/qt/Tutorial/src/MakeBottle.cxx. Lastly, you can build your own very first application. To create such entities, you need a specific data structure, which implements 3D geometric objects. To position the cylinder, you need to define a coordinate system with the gp_Ax2 class defining a right-handed coordinate system from a point and two directions - the main (Z) axis direction and the X direction (the Y direction is computed from these two). As previously mentioned, these thread profiles are computed on two cylindrical surfaces. From here, I like to just name it what it is, and how many stages. Ask for the resulting loft shape with the Shape method. You have computed the wires of the threading. From a programming standpoint, Open CASCADE Technology is designed to enhance your C++ tools with 3D modeling classes, methods and functions. You are for me one of the most read blog poster, and for sure the first relating on OpenCascade. And read the number of shapes in my file tutorial helps you your... 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