如何在 MATLAB 中圍繞一個點繪制立方體（3D 框）？

Question

如何在 Matlab 中圍繞 3D 點繪制 3D 邊界框？ 例如，圍繞 3D 點 (20,3,10) 繪制立方體 (15x15x15)； 該點應位於立方體的內部和中心。

Answer 1

你想讓盒子的六個面是半透明的嗎？ 如果是這樣，您可以使用以下內容：

% 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

相反，如果您希望六個面完全透明，您可以重復上面的代碼，但將FaceAlpha設置為0.0而不是0.3