如何在MATLAB中绘制点周围的立方体(3D盒)？

Question

在Matlab中，如何在3D点周围绘制三维包围框？例如，在3D点(20、3、10)周围绘制立方体(15x15x15)；该点应位于立方体的内部和中心。

Answer 1

你想要盒子的六面是半透明的吗？如果是这样的话，您可以使用以下内容：

% Center point is at coordinate [ax ay az].
ax = 20;  ay = 3;  az = 10;

% Full-width of each side of cube.
w = 15;

% For readability.
h = w/2;

patch_args = { 'FaceColor', 'b', 'FaceAlpha', 0.3 };

% Side #1 of 6.
patch( 'XData', ax+[-h -h  h  h], 'YData', ay+[-h  h  h -h], 'ZData', az+[-h -h -h -h], patch_args{:} )
daspect( [1 1 1] )  % 1:1:1 aspect ratio.
hold on
% Side #2 of 6.
patch( 'XData', ax+[-h -h  h  h], 'YData', ay+[-h  h  h -h], 'ZData', az+[ h  h  h  h], patch_args{:} )
% Side #3 of 6.
patch( 'XData', ax+[-h -h  h  h], 'YData', ay+[ h  h  h  h], 'ZData', az+[-h  h  h -h], patch_args{:} )
% Side #4 of 6.
patch( 'XData', ax+[-h -h  h  h], 'YData', ay+[-h -h -h -h], 'ZData', az+[-h  h  h -h], patch_args{:} )
% Side #5 of 6.
patch( 'XData', ax+[ h  h  h  h], 'YData', ay+[-h -h  h  h], 'ZData', az+[-h  h  h -h], patch_args{:} )
% Side #6 of 6.
patch( 'XData', ax+[-h -h -h -h], 'YData', ay+[-h -h  h  h], 'ZData', az+[-h  h  h -h], patch_args{:} )

% Red dot in middle.
scatter3( ax, ay, az, 'or', 'filled', 'SizeData', 150 )

hold off

如果您希望六方完全透明，则可以重复上面的代码，但将FaceAlpha设置为0.0而不是0.3