how to merge 2D and 3D plots with desired positioning

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Davit Hakobyan 2013-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/80823-how-to-merge-2d-and-3d-plots-with-desired-positioning

Hi everybody. I have one 3d cylinder and one 2d circle. I want to plot them together the circle being the fundamental layer of cylinder at z=0. Thank's in advance. Here so far what I have, I can plot them separately. clear all; clc; close all;

P = imread('image.jpg');%

A = P(:,:,2); %select one channel

D = double(A(:,:)); %make it double

r=207;% the circle radius

 k = size(D,2); %the z direction
t = 1:k;
theta=linspace(0,2*pi,size(D,1));
[time,angle]= meshgrid(t,theta);

x = r*cos(angle);

y = r*sin(angle);

c = D(:,:);

figure(1)

surface(x,y,time,c)% making cylinder

 set(gcf,'Position',[0 0 400 700 ]);
view([-164,-26])
shading interp

sz=size(A); x2=633; y2=529; % center of region

[x1grid, y1grid] = meshgrid(1:sz(2), 1:sz(1));

x1 = x1grid - x2; % offset the origin y1 = y1grid - y2;

circlemask = x1.^2 + y1.^2 > r.^2;

% Use the mask to select part of the image

circle_image = double(A) .* circlemask-double(A);

hold all

figure(2) imagesc(circle_image);% circular part

shading interp

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回答（1 个）

Hugo 2013-7-2

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You can use surf as you did with the cylinder. You then might need to define the grid small enough and set the colours outside the circle as NaN instead of zero.