MATLAB: How to get smoother color using 3D data with colors using ‘trisurf’

boundarycolorMATLABsmoothersurfacetrisurf

I have 4D data (3D (X, Y, Z) and color (C) data) which I use to plot with 'trisurf' function. The colors obtained for the surface using the same color data is not matching with what is received using 'scatter3'. How can I get smoother color results?

Best Answer

You can use the 'boundary' function. Following steps can achieve the desired functionality:

K = boundary(X, Y, Z, 0.7);
figure;
trisurf(K,X,Y,Z,C,'EdgeColor','none')
title('Using Boundary function')
axis equal

For more information about this function, refer to the following documentation link:

https://www.mathworks.com/help/matlab/ref/boundary.html

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MATLAB: Specifying color data for patchm or patchesm

The "cdata" parameter of both the "patchm" and "patchesm" constructor expects to receive a singular color value, specified as either a color name (e.g. 'r' or 'red') or an RGB triplet (e.g. [1 0 0]). It will not take in a vector of color values that correspond to the different face colors.

Unlike "patch", providing a scalar value for "cdata" in the constructor for "patchm" or "patchesm" does not use the "CDataMapping" property to map into the colormap.

However, since "patchm" supports nearly all the properties that are supported by the "patch" function, we can color the faces by passing property name/property value pairs to the "patchm" function, as follows:

>> patchm(latData, lonData, 'FaceVertexCData', faceColors, 'FaceColor', 'flat')

This command will create a single patch with multiple faces, with the face colors specified by the array "faceColors". Specifics on the allowed formats of the array "faceColors" can be found on the Patch Properties documentation page, under the property "FaceVertexCData", linked here:

https://www.mathworks.com/help/matlab/ref/matlab.graphics.primitive.patch-properties.html

Since "patchesm" returns an array containing a separate patch object for each face, it is necessary to set the color of each of the patch objects individually to accomplish the same behavior.

For more information about these properties, please refer to the above link.

MATLAB: How to add 3D labeled contours to a surface plot

The functions 'surf', 'contour3', and 'clabel' can be used together to produce an elegant plot. The example below demonstrates how:

>> figureHandle = figure;
>> axesHandle = axes(figureHandle);
>> hold on
>> surfaceHandle = surf(axesHandle, peaks,'linestyle','none','FaceAlpha',0.7);
>> [contourMatrix, contourHandle] = contour3(axesHandle, peaks,'k');
>> hold off
>> clabel(contourMatrix, contourHandle)

Best Answer

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MATLAB: Specifying color data for patchm or patchesm

MATLAB: How to add 3D labeled contours to a surface plot

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