shape.Custom3D

Create custom 3-D shape from other shapes or triangulation

Since R2023b

Description

The shape.custom3D lets you create a custom shape by using other shapes or triangulation with metal and dielectric material properties. Use this custom shape along with the other shapes and the geometric operations to create a shape for the custom antenna.

Creation

Syntax

custom3d = shape.Custom3D

custom3d = shape.Custom3D(tr)

custom3d = shape.Custom3D(Name=Value)

Description

custom3d = shape.Custom3D creates a custom shape.

custom3d = shape.Custom3D(tr) creates a custom shape using the triangulation data, where tr object is created using the triangulation function.

custom3d = shape.Custom3D(Name=Value) sets additional Properties using one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as Name1=Value1, ..., NameN=ValueN. Properties that you do not specify retain their default values.

Properties

Name — Name of custom shape

"custom3D" (default) | string

Name of the custom shape, specified as a string.

Example: "CustomShape1"

Data Types: string

Vertices — Cartesian coordinates of polygon vertices

8-by-3 matrix (default) | N-by-3 matrix

Cartesian coordinates of the shape vertices, specified as a N-by-3 matrix in meters, where N is the number of points.

Example: [-1 0 0; -0.5 0.2 0; 0 0 0]

Data Types: double

Metal — Metal material of shape

"PEC" (default) | string

Metal material of the shape, specified as a metal name string from the Metal Catalog.

Example: "Copper"

Data Types: string

Dielectric — Dielectric material of shape

"Air" (default) | string

Dielectric material of the shape, specified as a dielectric name string from the Dielectric Catalog.

Example: "Teflon"

Data Types: string

Color — Color of shape

"y" (default) | character scalar | "Individual" | three-element real vector of RGB triplet

Color of shape, specified as either a character for color short name or a three-element real vector of RGB triplets. The default shape color is yellow. See the Types of Color Values supported by this property. When you unite two shapes of different colors, use "Individual" value to retain the colors of the original shapes in the resultant shape.

Example: "r"

Example: [0 0.447 0.741]

Data Types: double | string | char

Transparency — Transparency of shape

1 (default) | positive scalar within (0,1)

Transparency of shape, specified as a scalar in the (0,1) range, where 0 corresponds to full transparency while 1 corresponds to full opaqueness.

Example: 0.75

Data Types: double

EdgeColor — Color of shape edges

"k" (default) | character scalar | "Individual" | three-element real vector of RGB triplet

Color of shape edges, specified as either a character for color short name or a three-element real vector of RGB triplets. The default edge color is black. See the Types of Color Values supported by this property. When you unite two shapes of different edge colors, use "Individual" value to retain the edge colors of the original shapes in the resultant shape.

Example: "b"

Example: [0.4940 0.1840 0.5560]

Data Types: double | string | char

Object Functions

add	Boolean unite operation on two shapes
subtract	Boolean subtraction operation on two shapes
intersect	Intersection of shape1 and shape2
plus	Join two shapes
minus	Carve a shape from other shape
and	Boolean intersection operation on two shapes
show	Display antenna, array structures, shapes, or platform
mesh	Mesh properties of metal, dielectric antenna, or array structure
rotate	Rotate shape about axis by angle
rotateX	Rotate shape about x-axis by angle
rotateY	Rotate shape about y-axis by angle
rotateZ	Rotate shape about z-axis by angle
translate	Move shape to new location
scale	Change size of shape by fixed factor
imprintShape	Imprint 2-D shape on another shape
createHole	Create a 2-D hole on custom shape
extrude	Extrude 2-D shape on another shape
removeFaces	Interactively select and remove 3-D shape faces
addSubstrate	Add dielectric substrate to metal shape

Examples

Join Box and Custom 3-D Shape

Create and join a box and a custom 3-D shape.

b = shape.Box;
c = shape.Custom3D; 
s = plus(b,c)

s = 
  Custom3D with properties:

            Name: 'custom3D'
        Vertices: [23x3 double]
           Metal: 'PEC'
      Dielectric: 'Air'
           Color: 'Individual'
    Transparency: 'Individual'
       EdgeColor: 'Individual'

Alternatively, you can directly join shapes using the '+' operator.

b + c;

Create Custom Antenna from Horn Antenna

This example shows how to create a custom antenna from an element in the antenna catalog.

Create a default horn antenna and manually mesh it with a maximum edge length of 0.01 m.

ant = horn;
feedLoc = ant.FeedLocation;
m = mesh(ant,MaxEdgeLength=0.01);

Use triangulation to store the mesh data of this horn antenna.

p = m.Points';
t = m.Triangles';
tr = triangulation(t(:,1:4),p)

tr = 
  triangulation with properties:

              Points: [328x3 double]
    ConnectivityList: [604x4 double]

Use shape.Custom3D to generate a horn shape from triangulation data. Visualize the shape.

hornShape = shape.Custom3D(tr);
show(hornShape)

Create a box.

hole = shape.Box(Length=0.012, Width=0.004, Height=0.005);
translate(hole,[-hole.Length 0 (hole.Length/2)+hole.Height/2]);

Cut a hole in the horn geometry by subtracting the box from it. Visualize the custom shape.

hornShape = subtract(hornShape,hole);
show(hornShape)

Use customAntenna to create a custom antenna from the custom horn shape. Add feed to it and visualize the antenna.

ant = customAntenna(Shape=hornShape);
[~] = createFeed(ant,feedLoc,1);
figure
show(ant)
title("Custom Horn Antenna")

Create Custom Shape by Intersecting Shapes

This example shows how to create a custom shape using a 3-D trapezoid and sphere.

Create and view a 3-D trapezoid.

a = shape.Custom3D(Color=[0.9290 0.6940 0.1250]);
show(a)

Create and view a sphere.

b = shape.Sphere(Color=[0.9290 0.6940 0.1250]);
show(b)

Intersect the 3-D trapezoid with the sphere and view the resultant shape.

intersect(a,b);

Version History

Introduced in R2023b