Hi,
Please try the below code to achieve what you have asked for:
figure
[X,Y,Z] = sphere(16);
x = [0.5*X(:); 0.75*X(:); X(:)];
y = [0.5*Y(:); 0.75*Y(:); Y(:)];
z = [0.5*Z(:); 0.75*Z(:); Z(:)];
scatter3(x,y,z)
hold on
P = [0,0,0] ; % you center point
L = [1,1,1] ; % your cube dimensions
O = P-L/2 ; % Get the origin of cube so that P is at center
plotcube(L,O,.8,[0 0 0]); % use function plotcube
hold on
plot3(P(1),P(2),P(3),'k')
where the plotcube function is take from: https://www.mathworks.com/matlabcentral/fileexchange/15161-plotcube
