surf() function query, shading a 3d mesh plot.

Question

Jack 2015-4-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214479-surf-function-query-shading-a-3d-mesh-plot

回答： Chad Greene 2015-5-1

Hi, Here is my code/graph that I want to shade in:

n=10;maxwidth=6;maxcolor=100;map=colormap(jet(maxcolor));
nelem=size(connectivity,1);
for ielem=1:nelem
    nodei=connectivity(ielem,1);nodej=connectivity(ielem,2);
    idof=ndof*(nodei-1)+1:ndof*(nodei-1)+ndof;jdof=ndof*(nodej-1)+1:ndof*(nodej-1)+ndof;
    Xi=U(idof,1); Xj=U(jdof,1);
    x=linspace(Xi(1),Xj(1),n);y=linspace(Xi(2),Xj(2),n);z=linspace(Xi(3),Xj(3),n);
    width=A(ielem)/max(A)*maxwidth;
    color=1+floor((N(ielem)-min(N))/(max(N)-min(N))*(maxcolor-1));
    plot3(x,y,z,'LineWidth',width,'Color',map(color,:));
    hold on;
end
grid on;
xlabel(['OX axis ' lengthunits]);ylabel(['OY axis ' lengthunits]); zlabel(['OZ axis ' lengthunits]); 
caxis([min(N) max(N)]);colorbar('location','eastoutside');
title(['title ' units]);

How would I go about this? using the surf() function? Thanks.

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Jack 2015-5-1

Sorry about the lack of clarity before the code. I just would like to know how to 'fill in the gaps' of the graph if you will.

Thanks.

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Answer 1

Chad Greene 2015-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/214479-surf-function-query-shading-a-3d-mesh-plot#answer_177442

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Looks like surf will do what you want, but you'll need a X, Y, and Z as gridded 2D variables, not 1D arrays. I can't fully interpret your code, but it looks like you can easily convert your x and y linear arrays to grids with meshgrid. Here are six ways to display gridded variables. I'll use caps for gridded variables:

% linear arrays: 
x = 1:50; 
y = 301:350; 
% gridded data: 
[X,Y] = meshgrid(x,y); 
Z = peaks(50); 
subplot(231)
plot3(X,Y,Z)
title 'plot3'
subplot(232)
mesh(X,Y,Z) 
title 'mesh'
subplot(233)
imagesc(x,y,Z)
axis xy
title 'imagesc'
subplot(234)
pcolor(X,Y,Z)
shading interp
title 'pcolor'
subplot(235)
surf(X,Y,Z)
title 'surf'
subplot(236)
surf(X,Y,Z) 
shading interp
camlight
title 'surf+interp+camlight'