hey, you have to modify the DataAspectRatio property of the point cloud object, which defaults to [1 1 1]!
Here's an example on how to make all axis equal:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear all; close all;
% Random point cloud with 1000 (x, y, z) triplets with a dimension of roughly 30x10x5
mat = [round(30*randn(1000,1)),round(10*randn(1000,1)),round(5*randn(1000,1))];
% Show point cloud
ax = pcshow(mat)
% Normalize the data relative to the Y axis
ax.DataAspectRatio = [diff(ax.XLim), diff(ax.YLim), diff(ax.ZLim)] / diff(ax.YLim);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Hope it helps!
