Geometric Modeler

What You Will Learn With This Use Case

In this use case, you learn how to use the CATFrFTopologicalSweep operator to create circle sweeps with three guides.

CATFrFTopologicalSweep is to be used according to the general scheme of  topological operators.  If need be, you can take a look at "Overview of the Topological Operators" [1] for more information.

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The CAAAdtCircleSweepTwoGuidesRadius Use Case

CAAAdtCircleSweepTwoGuidesRadius is a use case of the CAAAdvancedTopologicalOperators.edu framework that illustrates the  CAAAdvancedTopologicalOperators framework capabilities.

The circle sweep which is created by this use case looks something like this:

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What Does CAAAdtCircleSweepTwoGuidesRadius Do ?

The use case:

• creates the curves and radius law to be used as input data.
• creates a CATFrFTopologicalSweep operator instance.
• run the CATFrFTopologicalSweep and retrieve the resulting body.

Note
This article only focuses on the operations related to the CATFrFTopologicalSweep operator. Refer to "Overview of the Topological Operators" [1] for more information on the operations which are not detailed in the article.

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How to Launch CATFrFTopologicalSweep

To launch CAAAdtCircleSweepTwoGuidesRadius, you will need to set up the build time environment, then compile CAAAdtCircleSweepTwoGuidesRadius.m, set up the run time environment, and then execute the use case [2].

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Where to Find the CAAAdtCircleSweepTwoGuidesRadius Code

The CAAAdtCircleSweepTwoGuidesRadius use case is made of a main named CAAAdtCircleSweepTwoGuidesRadius.cpp located in the CAAAdtCircleSweepTwoGuidesRadius.m module of the CAATopologicalOperators.edu framework:

where InstallRootDirectory is the directory where the CAA CD-ROM is installed.

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Step-by-Step

The use case is divided into the following main steps:

• Creating the two guides
• Creating a CATFrFTopologicalSweep operator instance
• Setting the radius law
• Running the operator and retrieving the resulting body (common to all operators - not discussed below).

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Creating the two guides

The curves to be used as guides are CATSpline that are simply created from the geometry factory. See [3] for information on how to create a spline.

Creating a CATFrFTopologicalSweep operator instance

The CATFrFTopologicalSweep operator is created by the CATCreateFrFTopologicalCircleSweep global function. The two guides are passed in the form of a list as the third argument of the function.

CATLISTP(CATGeometry) guides0;
CATGeometry * guideGeom1 = (CATGeometry*)pWireBody1 ;
CATGeometry * guideGeom2 = (CATGeometry*)pWireBody2 ;
guides0.Append(guideGeom1);
guides0.Append(guideGeom2);
    
// (a) - Create the sweep operator
//
CATFrFTopologicalSweep * pSweepOpe = CATCreateFrFTopologicalCircleSweep(piGeomFactory, 
        &topdata, &guides0);
  

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Setting the radius law

The radius law is created from the geometry factory.

// (b) - Create the radius law
//
CATLaw * radiusLaw = ((CATLaw*)(piGeomFactory -> CreateConstantLaw(0.0, 1.0, 10.0)));
pSweepOpe->SetRadiusLaw(radiusLaw); 

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In Short

This use case is an example of how to create a circle sweep with two guides and a radius law.

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References

History

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