如何删除3D Matlab图的背面 [英] How can I remove the back faces of a 3D matlab plot

问题描述

在matlab中绘制3d图形时，边界框的背面用白色填充:

When plotting a 3d graph in matlab, the back faces of the bounding box are filled in white:

这些可以很容易地通过以下方式全部删除

These can easily all be removed with

ax = gca;
ax.Color = [0, 0, 0, 0];

如何才能仅去除背面? (除了地板上的所有东西)

How can I remove just the rear sides? (everything but the floor)

推荐答案

使用未记录的Axes.Backdrop属性，您可以得到这种行为. Axes.Backdrop.Face.VertexData包含背景顶点的列表.我们可以找到并保持地板:

Using the undocumented Axes.Backdrop property, you can sort of get this behaviour. Axes.Backdrop.Face.VertexData contains a list of the vertices of the backdrop. We can find and keep the floor with:

ax = gca;
face = ax.Backdrop.Face;

% can be replaced with conditions on other axes and limits
point_on_face = face.VertexData(3,:) == ax.ZLim(1);
is_target_face = all(reshape(point_on_face, 4, []));
target_face_verts = logical(kron(is_target_face, ones(1, 4)));

% discard all but the first quad (the floor)
face.VertexData = face.VertexData(:,target_face_verts);

但是，当轴旋转时，将重新绘制这些四边形，这不是有效的解决方案.

However, when the axes are rotated, these quads are redrawn, making this not an effective solution.

我们可以通过添加事件侦听器来做进一步的工作:

We can go further by adding an event listener:

function h = set_walls(ax, varargin)
  function update()
    face = ax.Backdrop.Face;
    data = face.VertexData;
    if empty(data); return; end
    keep_verts = false(1, size(data, 2));
    for side = varargin'
      side = side{:};
      switch side
        case 'xmin'; point_on_face = data(1,:) == ax.XLim(1);
        case 'xmax'; point_on_face = data(1,:) == ax.XLim(2);
        case 'ymin'; point_on_face = data(2,:) == ax.YLim(1);
        case 'ymax'; point_on_face = data(2,:) == ax.YLim(2);
        case 'zmin'; point_on_face = data(3,:) == ax.ZLim(1);
        case 'zmax'; point_on_face = data(3,:) == ax.ZLim(2);
        otherwise; error('Unknown face');
      end
      is_target_face = all(reshape(point_on_face, 4, []));
      keep_verts = keep_verts | logical(kron(is_target_face, ones(1, 4)));
    end
    face.VertexData = data(:,keep_verts);
  end
  h = addlistener(ax, 'MarkedClean', @(x, y) update);
end

这会闪烁，但可以.该功能可用作set_walls(gca, 'zmin')

This flickers, but it works. The function can be used as set_walls(gca, 'zmin')

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