Add nodes (3D) placed at a distance H from starting nodes (3D)

Hi! Is there any way to generate other red coordinates on the same plane and with a distance H = 0.1 from the black coordinates ?

C_or = importdata("C1_or.mat");
C_new = importdata("C1_new.mat");
P = [25.9349 -15.0445 77.3427];

% C_or = importdata("C3_or.mat");
% C_new = importdata("C3_new.mat");
% P = [28.73645 -15.2786 69.24005];

figure
plot3(P(:,1),P(:,2),P(:,3),'k*','Markersize',20);
hold on
plot3(C_or(:,1),C_or(:,2),C_or(:,3),'k.','Markersize',10);  
plot3(C_new(:,1),C_new(:,2),C_new(:,3),'r.','Markersize',10);  
hold off
axis equal

The second figure is the expected result.

Answer 1

[Walter Roberson]

For any particular grouping:

Subtract the mean() of the coordinates in order to shift the coordinates to be relative to the centroid. Then use cart2pol to get angle and distance relative to the centroid. Add the offset to the distance, and then pol2cart . Add back the coordinates of the centroid to get the new coordinates.

[Alberto Acri]

Thanks for your answer. I'm not very familiar with Matlab but I will try to follow your procedure.

[Alberto Acri]

Hi @Walter Roberson, can you provide me with some of code?

[Walter Roberson]

Already did, https://www.mathworks.com/matlabcentral/answers/2026002-generate-new-coordinates-starting-from-initial-coordinates-that-are-arranged-outwards-by-a-distan#answer_1318942