plotting a surface on a cylinder top face

Im triying to plot a surface on the top face of a cylinder using surface command, when I ran the code I get the surface on the squre that block the the face and not only on the face- my code:

theta =0:0.01*pi:2*pi; r=0.8;

x=r*cos(theta); y=r*sin(theta); f=(1:1:4);

V=[x' y'];

Patch=patch('Faces',f,'Vertices',V,'FaceColor', [171 104 87]./255);

C=Patch.FaceColor;

xd = get(Patch, 'XData')';

yd = get(Patch, 'YData')';

z0=zeros(1,length(xd));

zf=0.1*ones(1,length(xd));

Vx_ud(:,1)=xd; Vx_ud(:,2)=xd; Vy_ud(:,1)=yd; Vy_ud(:,2)=yd;

Vz_ud(:,1)=z0; Vz_ud(:,2)=zf;

ud=patch(Vx_ud,Vy_ud,Vz_ud,C);

for i=1:length(xd)-1

Vx_s(:,i)=[xd(i) xd(i+1) xd(i+1) xd(i)];

Vy_s(:,i)=[yd(i) yd(i+1) yd(i+1) yd(i)];

Vz_s(:,i)=[0 0 0.1 0.1];

end

Vx_s(:,length(xd))=[xd(end) xd(1) xd(1) xd(end)];

Vy_s(:,length(xd))=[yd(end) yd(1) yd(1) yd(end)];

Vz_s(:,length(xd))=[0 0 0.1 0.1];

s=patch(Vx_s,Vy_s,Vz_s,C,'EdgeColor','none');

th_DPatch=[ud, s];

I=imread('road.jpg');

Z=0.1*ones(201);

Face=surface(x,y,Z,EdgeColor="none");

set(Face,'CData',I,'FaceColor','texturemap');

Answer 1

[Chunru]

theta =0:0.01*pi:2*pi;    r=0.8;
x=r*cos(theta); y=r*sin(theta); z=zeros(size(x));

% simple patch for base
p_base =patch(x, y, z, [171 104 87]./255);  hold on

% cylinder
[xc, yc, zc] = cylinder(r, length(theta)-1);
cc = repmat(reshape([171 104 87]./255, 1, 1, 3), size(xc));
surf(xc, yc, zc*0.1, cc, 'EdgeColor', 'none'); view(3)
% simple patch for base
p_top =patch(x, y, z+0.1, [171 104 87]./255);  

[Ilan Shklarsh]

Hello

May intantion is to use surface only on the top circle in round shap and not as a ractangle.

Do you know how to do that?

[Chunru]

See the update.