Combine multiple implicit surfaces in a stl file

2 次查看（过去 30 天）

显示更早的评论

Fabian Günther 2020-8-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/581052-combine-multiple-implicit-surfaces-in-a-stl-file

关闭： Fabian Günther 2020-8-18

在 MATLAB Online 中打开

Dear community,

I am trying to write and export several simultaneously created implicit surfaces to a common stl file.

If I export the two surfaces separately I get two stl files with correct surfaces, but as soon as I combine the data in Matlab the second surface is "destroyed".

Enclosed are the images of the separately created and the common stl document and my code for the common variant.

Many thanks already and best regards

clc
clear
close all
n=60;
t=pi/n;
x_max=1;
y_max=1;
z_max=1;
r_max=6;
r_vor=2*pi*r_max;
factor=pi./6;
xi = -x_max/2:t:x_max/2;
yi = -y_max/2:t:y_max/2;
zi = -z_max/2:t:z_max/2;
[x,y,z] = meshgrid(xi,yi,zi);
F=cos(2.*pi.*x).*sin(2.*pi.*y)+cos(2.*pi.*y).*sin(2.*pi.*z)+cos(2.*pi.*z).*sin(2.*pi.*x); %   G
% First body
[fs,v]=isosurface(x,y,z,F,0);
v(:,2)=v(:,2)+r_max;
[~,rho] = cart2pol(v(:,1),v(:,2));
theta=v(:,1).*factor;
[v(:,1),v(:,2)] = pol2cart(theta,rho);
[fc,v2,c] = isocaps(x,y,z,F,0);
v2(:,2)=v2(:,2)+r_max;
[~,rho2] = cart2pol(v2(:,1),v2(:,2));
theta2=v2(:,1).*factor;
[v2(:,1),v2(:,2)] = pol2cart(theta2,rho2);
fn = [fs ; fc+length(v(:,1))];
vn = [v ; v2];
 
% Second body
[fs99,v99]=isosurface(x,y,z,F,0);
v99(:,2)=v99(:,2)+r_max;
[~,rho99] = cart2pol(v99(:,1),v99(:,2));
theta99=v99(:,1).*factor;
[v99(:,1),v99(:,2)] = pol2cart(theta99,rho99);
phi=30/360*2*pi;
R99=[cos(phi) -sin(phi) 0;sin(phi) cos(phi) 0;0 0 1];
for i=1:length(v99(:,1))
    v99(i,:)=R99*v99(i,:)';
end
[fc99,v299,c99] = isocaps(x,y,z,F,0);
v299(:,2)=v299(:,2)+r_max;
[~,rho299] = cart2pol(v299(:,1),v299(:,2));
theta299=v299(:,1).*factor;
[v299(:,1),v299(:,2)] = pol2cart(theta299,rho299);
for i=1:length(v299(:,1))
    v299(i,:)=R99*v299(i,:)';
end
fn99 = [fs99 ; fc99+length(v99(:,1))];
fn99 = fn99+max(max(fn));
vn99 = [v99 ; v299];
% Combinition and Output using function stlwrite
fnges = [fn ; fn99];
vnges = [vn ; vn99];
stlwrite('geometry.stl',fnges,vnges);