How can I draw separating lines between colors in a 3D volume plot?

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luca pavarino 2019-6-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466426-how-can-i-draw-separating-lines-between-colors-in-a-3d-volume-plot

评论： luca pavarino 2019-6-13

I am visualizing a 3D scalar function using the patch command and a given colormap (hsv) associated with the scalar values of the function. Unfortunately, Matlab dow not separate colors with lines, a feature which can be very useful to distinguish close values with similar colors. How can I draw lines between colors in my 3D patch plot? Many thanks for your help,

Luca

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darova 2019-6-12

Can you please attach your data?

luca pavarino 2019-6-13

在 MATLAB Online 中打开

LV_S3_LAT.m

The Matlab code fragment is the following and the data file is attached.

Thanks,

Luca

LV_S3_LAT; %load the data
V = Vertices(:,2:4);
T = Triangles(:,2:4)+1;
sV = size(V,1);
sT = size(T,1);
LAT = Values(:,4);
LAT_LV = LAT - min(LAT);
hh=patch('Faces',T,'Vertices',V,'FaceVertexCData',LAT_LV,'FaceColor','interp','EdgeColor','interp');
colormap(hsv);
colorbar;
grid on
view(115,-16);
set(gca,'Color','k');
shading interp
lightangle(-15,0)
hh.FaceLighting = 'gouraud';
hh.AmbientStrength = 0.3;
hh.DiffuseStrength = 0.8;
hh.SpecularStrength = 0.9;
hh.SpecularExponent = 25;
hh.BackFaceLighting = 'unlit';

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回答（1 个）

KSSV 2019-6-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466426-how-can-i-draw-separating-lines-between-colors-in-a-3d-volume-plot#answer_378973

在 MATLAB Online 中打开

Remove the shading interp line after plotting.

LV_S3_LAT; %load the data
V = Vertices(:,2:4);
T = Triangles(:,2:4)+1;
sV = size(V,1);
sT = size(T,1);
LAT = Values(:,4);
LAT_LV = LAT - min(LAT);
hh=patch('Faces',T,'Vertices',V,'FaceVertexCData',LAT_LV,'FaceColor','interp','EdgeColor','interp','EdgeColor','k');
colormap(hsv);
colorbar;
grid on
view(115,-16);
set(gca,'Color','k');
% shading interp
lightangle(-15,0)
hh.FaceLighting = 'gouraud';
hh.AmbientStrength = 0.3;
hh.DiffuseStrength = 0.8;
hh.SpecularStrength = 0.9;
hh.SpecularExponent = 25;
hh.BackFaceLighting = 'unlit';

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KSSV 2019-6-13

That case, you need to plot the contours on the data. Use this file exchange:

https://in.mathworks.com/matlabcentral/fileexchange/38858-contour-plot-for-scattered-data

luca pavarino 2019-6-13

These solutions do not work:

a) removing shading interp line after plotting just draw the triangles boundary, which is not what I need (I need to draw the boundary between the colors assigned by the colormap, i.e. I need to draw the isochronal lines or a scala field over a 3D volume).

b) the TRICONTOUR(TRI,X,Y,Z) function is not what I need because it draws countour lines of Z. What I need would be a TRICONTOUR(TRI,X,Y,Z,W) where W is a scalar function defined over the 3D volume described by X, Y, Z, but such a functions does not seem to exist in Matlab.

Luca

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