Main Content

collisionMesh

Create convex mesh collision geometry

expand all in page

Description

Use collisionMesh to create a collision geometry as a convex mesh using a list of 3-D vertices relative to a frame of choice.

Creation

Syntax

MSH = collisionMesh(Vertices)
MSH = collisionMesh(___,Pose=pose)

Description

MSH = collisionMesh(Vertices) creates a convex mesh collision geometry from the list of 3-D Vertices. The vertices are specified relative to a frame of choice (collision geometry frame). By default, the collision geometry frame collocates with the world frame.

example

MSH = collisionMesh(___,Pose=pose) sets the Pose property of the mesh to pose, relative to the world frame.

Properties

expand all

Vertices of a mesh, specified as an N-by-3 matrix, where N is the number of vertices. Each row of Vertices represents the coordinates of a point in 3-D space. Note that some of the points can be inside the constructed convex mesh.

Data Types: double

Pose of the collision geometry relative to the world frame, specified as a 4-by-4 homogeneous matrix or an se3 object. You can change the pose after you create the collision geometry.

Note

Note that when the pose is specified as an se3 object, the Pose property stores the pose as a numeric 4-by-4 matrix.

Data Types: single | double

Object Functions

checkCollisionCheck if two geometries are in collision
fitCollisionCapsuleFit collision capsule around collision geometry
showShow collision geometry

Examples

collapse all

Open Live Script

Create an array consisting of the coordinates of ten points randomly chosen on the unit sphere. For reproducibility, set the random seed to the default value.

rng default
n = 10;
pts = zeros(n,3);
for k = 1:n
    ph = 2*pi*rand(1);
    th = pi*rand(1);
    pts(k,:) = [cos(th)*sin(ph) sin(th)*sin(ph) cos(ph)];
end

Create a convex mesh collision geometry from the array. Visualize the collision geometry.

m = collisionMesh(pts);
show(m)

Figure contains an axes object. The axes object with xlabel X, ylabel Y contains an object of type patch.

Create a second array similar to the first, but this time consisting of 1000 points randomly chosen on the unit sphere.

n = 1000;
pts2 = zeros(n,3);
for k = 1:n
    ph = 2*pi*rand(1);
    th = pi*rand(1);
    pts2(k,:) = [cos(th)*sin(ph) sin(th)*sin(ph) cos(ph)];
end

Create and visualize a mesh collision geometry from the array. Observe that choosing more points on the sphere results in a sphere-like mesh.

m2 = collisionMesh(pts2);
show(m2)

Figure contains an axes object. The axes object with xlabel X, ylabel Y contains an object of type patch.

Create an array consisting of the coordinates of the eight corners of a cube. The cube is centered at the origin and has side length 4.

cubeCorners = [-2 -2 -2 ; -2 2 -2 ; 2 -2 -2 ; 2 2 -2 ;...
    -2 -2 2 ; -2 2 2 ; 2 -2 2 ; 2 2 2]
cubeCorners = 8×3

    -2    -2    -2
    -2     2    -2
     2    -2    -2
     2     2    -2
    -2    -2     2
    -2     2     2
     2    -2     2
     2     2     2

Append cubeCorners to pts2. Create and visualize the mesh collision geometry from the new array. Because the cube contains the sphere, the sphere points that are interior to the cube are disregarded when creating the geometry.

pts3 = [pts2;cubeCorners];
m3 = collisionMesh(pts3);
show(m3)

Figure contains an axes object. The axes object with xlabel X, ylabel Y contains an object of type patch.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced in R2019b

expand all

See Also

Objects

Functions

Topics