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Transparent Sphere on a Polygon Plot

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I want to create a transparent sphere. First I plot a polygon, then I plot a transparent sphere (according to this: https://www.mathworks.com/matlabcentral/answers/59536-how-to-create-a-transparent-sphere), but the first polygon doesn't appear in the transparent sphere. Even though I plot the polygon over sphere, it still doesn't appear. How should I do that? Many thanks. My code is this:
close all;clear all;clc;
pA1=[-2.9,-0.9,0]';
pA2=[-1.2,3.0,0]';
pB1=[1.3,-2.3,0]';
pB2=[-1.2,-3.7,0]';
pC1=[2.5,4.1,0]';
pC2=[3.2,1.0,0]';
patch([pA1(1),pA2(1),pC1(1),pC2(1),pB1(1),pB2(1)],[pA1(2),pA2(2),pC1(2),pC2(2),pB1(2),pB2(2)],0)
grid on; axis equal;hold on;
text(pA1(1),pA1(2),'A1');text(pA2(1),pA2(2),'A2')
text(pB1(1),pB1(2),'B1');text(pB2(1),pB2(2),'B2')
text(pC1(1),pC1(2),'C1');text(pC2(1),pC2(2),'C2')
L1=5.0;L2=4.5;L3=5.0;L4=5.5;L5=5.5;L6=5.7;
[x y z] = sphere(128);x=L1*x;y=L1*y;z=L1*z;
h = surfl(x, y, z);
set(h, 'FaceAlpha', 0.1)
shading interp

Accepted Answer

WalterWhite
WalterWhite on 6 Jan 2021
try using flat shading (shading flat) instead of interpolating colormap shading (shading interp)

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