How do you get realistic textures when shading graphs?

Question

Elizabeth 2022-9-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1804600-how-do-you-get-realistic-textures-when-shading-graphs

编辑： Star Strider 2022-9-14

x = @(r, t) r.*cos(t);
y = @(r, t) r.*sin(t);
z = @(r) 3.*r;
r = linspace(0, 2, 30);
t = linspace(0, 2*pi, 15);
[R, T] = meshgrid(r,t);
X = x(R,T);
Y = y(R,T);
Z = z(R);
surf(X, Y, Z)
hold on
x = @(r, t, p)  r.*cos(t).*sin(p);
y = @(r, t, p) r.*sin(t).*sin(p);
z = @(r, p) r.*cos(p) + 6;
r = 2;
t = linspace(0, 2*pi, 100);
p = linspace(0, pi/2, 100);
[T, P] = meshgrid(t, p);
X = x(r, T, P);
Y = y(r, T, P);
Z = z(r, P);
surf(X, Y, Z)
shading interp
hold off
axis off
mycolors = [0.9 0.66 0.4;
    0.9 0.66 0.4;
    0.9 0.66 0.4;
    0.9 0.66 0.4;
    0.9 0.66 0.4;
    0.222 0.184 0.135;
    0.635 0.078 0.184;
    1 0 1];
colormap(mycolors)
axis equal

This is the code for an ice-cream shaped 3D graph. I would like to colour/shade the graph to look like a realistic ice cream but I cannot seem to find any information about how this is done if anyone can please help me.

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Answer 1

Star Strider 2022-9-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1804600-how-do-you-get-realistic-textures-when-shading-graphs#answer_1052855

编辑：Star Strider 2022-9-14

在 MATLAB Online 中打开

I am not certain what result you want.

One option is to interpolate the ‘mycolors’ matrix —

x = @(r, t) r.*cos(t);

y = @(r, t) r.*sin(t);

z = @(r) 3.*r;

r = linspace(0, 2, 30);

t = linspace(0, 2*pi, 15);

[R, T] = meshgrid(r,t);

X = x(R,T);

Y = y(R,T);

Z = z(R);

surf(X, Y, Z)

hold on

x = @(r, t, p) r.*cos(t).*sin(p);

y = @(r, t, p) r.*sin(t).*sin(p);

z = @(r, p) r.*cos(p) + 6;

r = 2;

t = linspace(0, 2*pi, 100);

p = linspace(0, pi/2, 100);

[T, P] = meshgrid(t, p);

X = x(r, T, P);

Y = y(r, T, P);

Z = z(r, P);

surf(X, Y, Z)

shading interp

hold off

axis off

icecream = [0.222 0.184 0.135;

0.635 0.078 0.184;

1 0 1]; % Original 'icecream' Part

icecreami = interp1((0:2), icecream, (0:0.1:2)); % Interpolate

mycolors = [0.9 0.66 0.4;

0.9 0.66 0.4;

icecreami];

mycolors = [repmat(mycolors(1,:),50,1);

icecreami]; % New 'mycolors' Matrix

colormap(mycolors)

axis equal

shading('interp')

See the documentation on the interp1 function for detailed information on it.

EDIT — (14 Sep 2022 at 1:06)

I just now remembered that the Lighting Overview may provide some help in working with the lighting propperties of your surface object. I am not experimenting with them here, because I am not certain what you want to do.

.