How t generate cone using scattered random point cloud?

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M.S. Khan 2020-10-20

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评论： anuradha verma 2022-11-11

Using the below code, i have geneated sphere. could anyone please guide me how to geneate cone using random scattered point cloud.

I will be very thankful. Thanks in advance to all community members for their cooperation and guidance. Regards

r = randn (10000,3);
r = round(bsxfun(@rdivide,r,sqrt(sum(r.^2,2)))*130);
    x = r(:,1);
    y = r(:,2);
    z = r(:,3);
    scatter3(x,y,z)

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M.S. Khan 2020-10-20

Dear KSSV, thanks for your kind reply. This code provides cone also but not random scattered point cloud. Regards

M.S. Khan 2020-10-20

They are using grid that means its uniform spaced points? Could you guide me how to generate cone using scattered random point cloud.

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采纳的回答

Bruno Luong 2020-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/619763-how-t-generate-cone-using-scattered-random-point-cloud#answer_518973

编辑：Bruno Luong 2020-10-20

在 MATLAB Online 中打开

This code provides the uniform distribution on the surface of the cone

h = 3; % height
r  = 1; % base radius
n = 1e4; % number of points
topcapflag = true; % include the top cap or not
rho = sqrt(rand(1,n));
z = h*rho;
if topcapflag
    z(rand(1,n)<r/(h+r))=h;
end
theta = (2*pi)*rand(1,n);
rho = r*rho;
x = cos(theta).*rho;
y = sin(theta).*rho;
% graphic check
figure
plot3(x,y,z,'.')
axis equal

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M.S. Khan 2020-10-21

Thanks Dearest Bruno for your professional supprot. Regards!

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更多回答（1 个）

Ameer Hamza 2020-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/619763-how-t-generate-cone-using-scattered-random-point-cloud#answer_518918

在 MATLAB Online 中打开

This is one way. The distribution is non-uniform

h = 2; % height of cone
r = 1; % maximum radius of cross section of the cone
n = 10000;
z = rand(1, n)*h;
t = rand(1, n)*2*pi;
r = interp1([0 h], [0 r], z);
[x, y] = pol2cart(t, r);
scatter3(x, y, z)