how to get the polarplot from trisurf chart

From many types of theta, phi, power data, I want to draw trisurf and polarplot.

theta, phi datas include complicated value such as x.xx degree. so I used delaunay triangle to make 3d surf chart.

for example.

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theta = 0: 5: 180; 
phi = 0: 5: 355; 
[theta, phi] = meshgrid(theta,phi); 
theta = reshape(theta,2664,1); 
phi = reshape(phi,2664,1); % making basic theta,phi data. 
tri = delaunay(theta, phi);
x= measuredPowerdata.*sind(theta).*cosd(phi);
y= measuredPowerdata.*sind(theta).*sind(phi);
z=measuredPowerdata.*cosd(theta);
figure(1)
trisurf(tri,x,y,z,measuredPowerdata);
view(3);
figure(2)
trisurf(tri,theta,phi,measuredPowerdata);
view(2);

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in this case, I can find theta=60 deg phi sweep data easily and draw polarplot, because theta has specific position such as theta == 60deg position.

But, after axis conversion, theta, phi value would be changed to weird value such as 107.2434deg .......

So, I tried

tri = delaunay(theta,phi); tr = triangulation(tri,theta,phi);
ph1 = 0:5:355; th1 = ones(1,72)*60; 
P = [th1',ph1'];
ID = pointLocation(tr,P);
tr.Point(ID)??
fig1 = trisurf(tri,theta,phi,measuredPowerdata); [temp_theta,temp_rho] = find(fig1.Vertices(:,1) ==60);
polarplot(temp_theta,temp_rho);

But I failed.

How to get polarplot from weird theta, phi vector and powerdata??