Method do_3d_projection

lib/mpl_toolkits/mplot3d/art3d.py:1084–1127

(self)

        self.stale = True

    def do_3d_projection(self):
        mask = False
        for xyz in self._offsets3d:
            if np.ma.isMA(xyz):
                mask = mask | xyz.mask
        mask = mask | _scale_invalid_mask(*self._offsets3d, self.axes)
        if self._axlim_clip:
            mask = mask | _viewlim_mask(*self._offsets3d, self.axes)
        if np.any(mask):
            mask = np.broadcast_to(mask,
                                   (len(self._offsets3d), *self._offsets3d[0].shape))
            xyzs = np.ma.array(self._offsets3d, mask=mask)
        else:
            xyzs = self._offsets3d
        vxs, vys, vzs, vis = proj3d._scale_proj_transform_clip(*xyzs, self.axes)
        self._data_scale = _get_data_scale(vxs, vys, vzs)
        # Sort the points based on z coordinates
        # Performance optimization: Create a sorted index array and reorder
        # points and point properties according to the index array
        z_markers_idx = self._z_markers_idx = np.ma.argsort(vzs)[::-1]
        self._vzs = vzs

        # we have to special case the sizes because of code in collections.py
        # as the draw method does
        #      self.set_sizes(self._sizes, self.figure.dpi)
        # so we cannot rely on doing the sorting on the way out via get_*

        if len(self._sizes3d) > 1:
            self._sizes = self._sizes3d[z_markers_idx]

        if len(self._linewidths3d) > 1:
            self._linewidths = self._linewidths3d[z_markers_idx]

        PathCollection.set_offsets(self, np.ma.column_stack((vxs, vys)))

        # Re-order items
        vzs = vzs[z_markers_idx]
        vxs = vxs[z_markers_idx]
        vys = vys[z_markers_idx]

        # Store ordered offset for drawing purpose
        self._offset_zordered = np.ma.column_stack((vxs, vys))

        return np.min(vzs) if vzs.size else np.nan

    @contextmanager
    def _use_zordered_offset(self):