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Creating Bodies and Shapes

This example will show the basic operations to create bodies and shapes, and add modifiers to it.

Create a Sketch

A sketch is a shape, and all shapes define static Create functions. Always use this functions instead of instantiating the class yourself. It makes sure that it is correctly initialized and linked inside the body.

var sketch = Sketch.Create();

After we have created the sketch, we can fill it. A sketch is defined by three components: points, segments and constraints. Points are just that - 2d points. They are represented by the value class Pnt2d and referenced by an index. The profile we want to define is a half circle, so we need three points: Two corner points and a rim point of the half circle.

sketch.Points.Add(0, new Pnt2d(-5.0, 0.0)); // Corner 1
sketch.Points.Add(1, new Pnt2d( 0.0, 5.0)); // Rim point of circle arc
sketch.Points.Add(2, new Pnt2d( 5.0, 0.0)); // Corner 2

Now we want to define the segments. A segment is represented by a class derived from SketchSegment. The following segments are available:

Segment Type

Description

SketchSegmentLine

A straight line connecting two points.

SketchSegmentBezier

A quadratic or cubic Bézier curve connecting two points, taking another one or two control points.

SketchSegmentCircle

A complete circle, described by the center point and a rim point.

SketchSegmentArc

A circle arc, described by the end points and a rim point.

SketchSegmentEllipse

A complete ellipse, described by the center point, a rim point and the point on the major axis.

SketchSegmentEllipticalArc

A elliptical arc, described by the end points and the center point. The start point must be a rim point, the end point on the major axis.

For our profile, we need a circle arc, and a line segment.

sketch.Segments.Add(0, new SketchSegmentArc(0, 2, 1));
sketch.Segments.Add(1, new SketchSegmentLine(2, 0));
Create a Body

Now we have an initial shape (primitive), we can create a body. For this, we use again the static Create function. This function takes the initial shape as parameter, this is why we need to create the shape first.

var body = Body.Create(sketch);

The body needs to be added to the current model to get available outside the script.

Document.Add(body);

That's it, we have created a new sketch with a simple profile.

Adding a Modifier

Now we have a sketch profile, we want to extrude it to get a solid. We create a new shape, this time not a primitive, but a modifier. Modifier shapes always take the body as creation parameter and takes care for the whole topology work for you. The only task you need to do is to tune the parameters of the modifier.

var extrude = Extrude.Create(body);
extrude.Depth = 100.0;
Complete Script
// This script creates a simple half circle profile.
// It shows how to create a sketch, add a extrude to it
// and create a body for it.

// Create new Sketch
var sketch = Sketch.Create();

// Add profile points
sketch.Points.Add(0, new Pnt2d(-5.0, 0.0));
sketch.Points.Add(1, new Pnt2d( 0.0, 5.0));
sketch.Points.Add(2, new Pnt2d( 5.0, 0.0));

// Add profile segments
sketch.Segments.Add(0, new SketchSegmentArc(0, 2, 1));
sketch.Segments.Add(1, new SketchSegmentLine(2, 0));

// Create Body and add to model
var body = Body.Create(sketch);
Document.Add(body);

// Extrude
var extrude = Extrude.Create(body);
extrude.Depth = 100.0;
See Also

Other Resources