# Plotting 3D by rotate 2D plot around y-axis

12 次查看（过去 30 天）
Tuan2023-3-23

I have a question to draw a 3D cup of coffe (no need to draw a handle). I think to be easy we need to draw 2 parabol ( inner and outter ) , the upper bound and bottom bound, then rotate that 2D plot around y-axis, but I dont have any idea and knowledge to do that, is there another way ? Can anyone help me with this, many thanks

### 采纳的回答

Star Strider 2023-3-23
Probably the easiest way is to define a cylinder and a shape vector —
yv = [linspace(0.3, 1, 50)];
ys1 = yv.*exp(-1.75*yv)*5;
ys2 = (1-exp(-25*(yv-0.3)))*0.7;
figure
plot(ys1, yv)
hold on
plot(ys2, yv)
hold off
grid
% xlim([0 1.5])
axis ('equal')
[X1,Y1,Z1] = cylinder(ys1,50);
[X2,Y2,Z2] = cylinder(ys2,50);
figure
surf(X1,Y1,Z1, 'EdgeColor','interp', 'FaceAlpha',0.5) % Outer Surface
hold on
surf(X2,Y2,Z2, 'EdgeColor','interp') % Inner Survface
patch([X1(end,:) X2(end,:)], [Y1(end,:) Y2(end,:)], [Z1(end,:) Z2(end,:)], 'r', 'EdgeColor','r') % Top Rim
patch([X1(1,:) X2(1,:)], [Y1(1,:) Y2(1,:)], [Z1(1,:) Z2(1,:)], 'b', 'EdgeColor','b') % Lower Surface
hold off
colormap(turbo)
This demonstrates the construction approach, and setting the outer ‘FaceAlphs’ value to shows the internal structure as well.
Experiment with the ‘ys1’ and ‘ys2’ shape vectors to get the result you want. To get the inner and outer thicknesses, it will likely be necessary to use two cyllinder objects with different shapes, and the hold function to plot both of them on the same axes. The patch call creating the top rim will autoomatically adapt to whatever the inner and outer contour functions are. Another patch call can provide a solid lower surface as well, if that is necessary. (I use the turbo colormap her because I like it. Choose the appropriate colormap for your plot.)
.
##### 4 个评论显示 3更早的评论隐藏 3更早的评论
Star Strider 2023-3-24
As always, my pleasure!
Thank you! You, too!

### 更多回答（1 个）

KSSV 2023-3-23
This might be useful. Checkout:
##### 1 个评论显示 无隐藏 无
Tuan 2023-3-23
Thanks but this still a static image, what i mean is create a 3D object with this

### 类别

Find more on Lighting, Transparency, and Shading in Help Center and File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by