how to merge 2D and 3D plots with desired positioning
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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
回答（1 个）
Hugo
2013-7-2
0 个投票
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.
4 个评论
Davit Hakobyan
2013-7-2
Hugo
2013-7-2
surf(x,y,z,c) x,y,z are the positions of the nodes of the grid and c are the colours. You need to specify 'EdgeColor','none', so that they are not drawn.
For moving the surface around, you just need to add a constant value to x, y or z. For rotations, you need to group the points in a 3D matrix and multiply by an appropriate rotation matrix. I suggest you to find what rotation matrices in 3D are in wikipedia if you don't know them, as it is much easier than explain that here.
Davit Hakobyan
2013-7-2
Davit Hakobyan
2013-7-2
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