Patch FaceVertexCData being overwritten by FaceColor

Hello,

I am attempting to set up a patch with R2016b wherein one face of the patch has a certain color, and the rest share another. To do this I set up an (m x 3) array, "FacetColor," that assigned an RGB triplet to every face in the patch, according to its position in the geometry. The patch was then created with the code:

fv=struct('faces',facet,'vertices',vertex);

h=patch(fv,'FaceVertexCData', FacetColor,  ...
         'EdgeColor',       'none',        ...
          'FaceLighting',    'gouraud',     ...
         'AmbientStrength', 0.4);
alpha(h,1);

Unfortunately, whenever I attempt to run this code, MATLAB apparently ignores my FacetColor array and instead uses the default FaceColor value of [0 0 0]. This turns the entire patch uniformly black. I tried setting the FaceColor value to 'none,' thinking that doing so might force MATLAB to use the FaceVertexCData field, but instead it causes the patch to turn invisible. How am I configuring this patch incorrectly?

Any advice or assistance would be appreciated! My thanks in advance.

Answer 1

[Duncan Lilley]

In order for the patch to use the color data you have specified, you must set the "FaceColor" property to be either "flat" or "interp". As you have specified a color for each face, you will likely want to set "FaceColor" to "flat", which indicates that each face will be a uniform color, with "FaceVertexCData" specifying one color per face.

More information about this property and its possible settings can be found on the "patch" documentation page under "Name-Value Pair Arguments", here.