# How to color triplot faces?

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Manar Al Asad on 26 Aug 2020
Answered: Cris LaPierre on 27 Aug 2020
I have a 3D DTM in the form of triangulation (has faces and vertices) where the vertices coordinates are in cartesian coordinates (X,Y,Z). I would like to plot the DTM colored based on the radial position of each point.
In 3D this looks like the following, where r1 is a structure that has 2 fields: facets which a connectivity list, and vertices which is the point coordinates:
llr1(:,1),llr1(:,2),llr1(:,3)] = cart2sph(r1.vertices(:,1),...
r1.vertices(:,2),r1.vertices(:,3)); % convert to spherical coordinates to get radial position
llr1(:,1) = rad2deg(llr1(:,1)); % convert to degrees
llr1(:,2) = rad2deg(llr1(:,2)); % convert to degrees
figure(1)
trisurf(r1.obj.facets,r1.obj.vertices(:,1),r1.obj.vertices(:,2),...
r1.obj.vertices(:,3),llr1(:,3)) Now I would like to do the same thing in 2D simple cylindrical projection
figure(2);
triplot(r1.obj.facets,llr1(:,1),llr1(:,2))
gives me a line map with the right connectivity but now I would like to color the faces in the 2d plot. Has anyone encountered this problem before and has a simple solution to it?

Cris LaPierre on 27 Aug 2020
I believe a triplot is a line plot. You can color the lines and markers (vertices), but there are no faces to color.

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