OCCT can be best applied in development of software dealing with 3D modeling (CAD), manufacturing / measuring (CAM) or numerical simulation (CAE). Since more than one face can be removed from the initial solid, the BRepOffsetAPI_MakeThickSolid constructor takes a list of faces as arguments. 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. This section shows some of the ways that OpenCascadeLink can be applied. 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. However, the Geom package provides only the data structure of geometric entities. 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. Build your first application with Open CASCADE: The Open CASCADE tutorial helps you take your first steps with the components. To get the X axis, just call the gp::OX method: As previously explained, the 3D geometric transformation is defined with the gp_Trsf class. This information is given with the. has a plane (planar surface) as underlying geometry; is the highest face (in Z coordinates) of the bottle. Our professional services can maximize the power of your Open CASCADE Technology applications. Welcome to Open CASCADE Technology (OCCT), a software development platform providing services for 3D surface and solid modeling, CAD data exchange, and visualization. As previously mentioned, these thread profiles are computed on two cylindrical surfaces. Your bottle is complete. Open Cascade Commercial Platform is a unified technology, which as a backbone connects all the variety of proprietary software functionalities. Here is the result snapshot of the Tutorial application: We hope that this tutorial has provided you with a feel for the industrial strength power of Open CASCADE Technology. The combination of all these resources will allow you to create substantial applications. All the necessary data are now available so you can create your hollowed solid by calling the BRepOffsetAPI_MakeThickSolid constructor: Up to now, you have learned how to create edges out of 3D curves. We first define the bottle specifications as follows: In addition, we decide that the bottle's profile (base) will be centered on the origin of the global Cartesian coordinate system. To create a face, use the BRepBuilderAPI_MakeFace class. When creating the bottle's profile, you used classes from the GC package, providing algorithms to create elementary geometries. 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. The loft function is implemented in the BRepOffsetAPI_ThruSections class, which you use as follows: You are almost done building the bottle. It also creates an output file of the geometry in STEP format. You need to concatenate them to compute a single shape. Three edges out of the previously computed curves. compute the edges of the neck's threading. The theory is more complex than in previous steps, but applying it is very simple. The file is located in build/bin/boxWitHole.stp. Provided by an Open Cascade expert directly, the training is the fastest way to start working with our software. 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. You have created two wires: aWire and aMirroredWire. It accepts a shape and a direction as input and generates a new shape according to the following rules: Your current profile is a wire. Once this is done, you perform the last step of the procedure by asking for the filleted shape. As a first step, you compute these cylindrical surfaces. The Prism functionality of Open CASCADE Technology is the most appropriate for that task. If you need to create a quarter of a circle, you create a Geom_TrimmedCurve on C limited between 0 and M_PI/2. Welcome to OpenCASCADE tutorials! 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. Reply Delete. To access the point corresponding to the parameter of a curve or a surface, you use the Value or D0 method (meaning 0th derivative), D1 method is for first derivative, D2 for the second one. O, *Dir, yDir and zDir are respectively the origin, the X direction, Y direction and Z direction of the cylindrical surface local coordinate system. To simplify the modeling, it would be right to manipulate these three curves as a single entity. You need to concatenate them to compute a single shape. As a first step, you compute these cylindrical surfaces. 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. Due to the nature and complexity of this task, this tutorial will be a bit longer than usual, but the reward is massive. compute a new wire by reflecting the existing one. Lastly, you can build your own very first application. Each one must then be added in the BRepFilletAPI_MakeFillet instance with the Add() method. In order to do object recognition/detection with cascade files, you first need cascade files. One important data item is missing as far as these wires are concerned: there is no information on the 3D curves. 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. Then try out Draw, to test or demonstrate them, and learn how to run the samples. This is a brief tutorial for setting up Python OpenCASCADE wrapper pythonOCC and loading an IGES file Programmatic Modeling Consultants 978-992-7689 email@example.com For example, a Geom2d_Ellipse ellipse is defined from: To describe portions of curves for the arcs drawn above, you define Geom2d_TrimmedCurve trimmed curves out of the created ellipses and two parameters to limit them. The bottle's profile is almost finished. All objects manipulated by handle, like Geom_Surface, inherit from the Standard_Transient class which provides two very useful methods concerning types: DynamicType returns the real type of the object, but you need to compare it with the existing known types to determine whether aSurface is a plane, a cylindrical surface or some other type. You will create the profile of threading by creating 2D curves on such a surface. You will now learn how to create an edge out of a 2D curve and a surface. One important data item is missing as far as these wires are concerned: there is no information on the 3D curves. But in this tutorial all will use Opencascade 6.6.0. The purpose of this tutorial is not to describe all Open CASCADE Technology classes but to help you start thinking in terms of Open CASCADE Technology as a tool. This tutorial assumes … 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). To create a face, use the BRepBuilderAPI_MakeFace class. Now you can create a cylindrical surface (Geom_CylindricalSurface) using: Using the same coordinate system neckAx2 used to position the neck, you create two cylindrical surfaces Geom_CylindricalSurface with the following radii: Notice that one of the cylindrical surfaces is smaller than the neck. 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. 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. 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). Haar-cascade Detection in OpenCV¶ OpenCV comes with a trainer as well as detector. For example, Geom_Line and Geom_Circle classes belong to the Geom package. The combination of all these resources will allow you to … Remember that these wires were built out of a surface and 2D curves. All geometries defined in the Geom package are parameterized. Referring to the Shape/Generates table, you need to compute a face out of its wire to generate a solid. The Qt programming tutorial teaches how to use Open CASCADE Technology services to model a 3D object. the shape on which the transformation must be applied. It includes a set of C++ class libraries providing services for 3D surface and solid modeling, CAD data exchange, and visualization. Welcome to an object detection tutorial with OpenCV and Python. Do not forget to specify the radius of the fillet along with it. the derivative vectors of order 1, 2 to N at this point. As previously explained, a face is a part of a surface bounded by a closed wire. To handle possible errors more explicitly, you may use the IsDone and Value methods. As previously explained, a face is a part of a surface bounded by a closed wire. Part 5 ... Great tutorial congratulations! Hello I am new to OPENCASCADE and i want to understand the STEP file format i.e produce the shapes in it and do various type of modifications in a STEP file, basically i must be able to extract all the information given in a STEP file. Just apply the BRepPrimAPI_MakePrism class to compute the solid: The edges of the bottle's body are very sharp. Referring to the Shape/Generates table, you need to compute a face out of its wire to generate a solid. To simplify the modeling, it would be right to manipulate these three curves as a single entity. Your final step before creating the hollowed solid is to put this face in a list. the shape on which the transformation must be applied. XDE offers a pre-defined document sub-structure to store colors, names, layers as well as other attributes (see XDE User’s Guide for details). 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. As its name implies, this static method is used to downcast objects to a given type with the following syntax: Remember that the goal of all these conversions is to find the highest face of the bottle lying on a plane. To replace them by rounded faces, you use the Fillet functionality of Open CASCADE Technology. Now, you can create the two profiles of the threading, lying on each surface. To create the bottle's profile, you first create characteristic points with their coordinates as shown below in the (XOY) plane. The BRepAlgoAPI package provides services to perform Boolean operations between shapes, and especially: common (Boolean intersection), cut (Boolean subtraction) and fuse (Boolean union). 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Raise an exception if construction has failed classifier training face ( s ) D ) all edges the! The hollowed solid is open cascade tutorial put this face in a list, use the and.