barycentricToCartesian

Convert coordinates from barycentric to Cartesian

Description

example

C = barycentricToCartesian(TR,ID,B) returns the Cartesian coordinates of the points in B relative to the triangulation object TR. Each row of B contains the barycentric coordinates of a point with respect to the triangle or tetrahedron indexed by ID. The identification numbers of the triangles or tetrahedra in TR are the corresponding row numbers of the property TR.ConnectivityList.

Examples

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Create a triangulation from a set of points P and a triangulation connectivity list T, and plot the triangulation.

P = [2.5 8.0; 6.5 8.0; 2.5 5.0; 6.5 5.0; 1.0 6.5; 8.0 6.5];
T = [5 3 1; 3 2 1; 3 4 2; 4 6 2];
TR = triangulation(T,P);
triplot(TR) Specify the identification number of the first (leftmost) triangle in TR, and the barycentric coordinates of the triangle's second point.

ID = 1;
B = [0 1 0];

Convert the barycentric coordinates to Cartesian coordinates with respect to the first triangle in TR.

C = barycentricToCartesian(TR,ID,B)
C = 1×2

2.5000    5.0000

Input Arguments

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Triangulation representation, specified as a scalar triangulation or delaunayTriangulation object.

Data Types: triangulation | delaunayTriangulation

Triangle or tetrahedron identification, specified as a scalar or a column vector whose elements each correspond to a single triangle or tetrahedron in the triangulation object. The identification number of each triangle or tetrahedron is the corresponding row number of the ConnectivityList property.

Data Types: double

Barycentric coordinates, specified as a three-column matrix for 2-D coordinates or a four-column matrix for 3-D coordinates.

Data Types: double