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

Answer 1

[Hugo]

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.

[Davit Hakobyan]

Thank you, but how to handle the position?

[Hugo]

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]

Can you please provide me some code. I guess for you it will take instant.I am beginner, and I get lost in process with in errors.

[Davit Hakobyan]

Thank I have solved the problem