How to fixed the grid size in the mayavi?

[rockywind]

Dear, author, I found that if only one object is in the scene, the grid size is larger than the two objects in the scene. My code is below.

    # Compute the voxels coordinates
    grid_coords = get_grid_coords(
        [voxels.shape[0], voxels.shape[1], voxels.shape[2]], voxel_size
    )

    # Attach the predicted class to every voxel

    grid_coords = np.vstack([grid_coords.T, voxels.reshape(-1)]).T

    # Remove empty and unknown voxels
    occupied_voxels = grid_coords[(grid_coords[:, 3] > 0) & (grid_coords[:, 3] < 255)]

    # Draw occupied voxels
    plt_plot = mlab.points3d(
        occupied_voxels[:, 0],
        occupied_voxels[:, 1],
        occupied_voxels[:, 2],
        occupied_voxels[:, 3],
        colormap="viridis",
        scale_factor=voxel_size - 0.5 * voxel_size,
        mode="cube",
        opacity=1.0,
        vmin=0,
        vmax=12,
    )

    colors = np.array(
        [
            [100, 150, 245, 255],
            [100, 230, 245, 255],
            [30, 60, 150, 255],
            [80, 30, 180, 255],
            [100, 80, 250, 255],
            [255, 30, 30, 255],
            [255, 40, 200, 255],
            [150, 30, 90, 255],
            [255, 0, 255, 255],
            [255, 150, 255, 255],
            [75, 0, 75, 255],
            [175, 0, 75, 255],
            [255, 200, 0, 255],
            [255, 120, 50, 255],
            [0, 175, 0, 255],
            [135, 60, 0, 255],
            [150, 240, 80, 255],
            [255, 240, 150, 255],
            [255, 0, 0, 255],
        ]
    ).astype(np.uint8)

    plt_plot.glyph.scale_mode = "scale_by_vector"

    plt_plot.module_manager.scalar_lut_manager.lut.table = colors

    mlab.show()
    mlab.savefig(filename=save_path)

[anhquancao]

Hi @rockywind, I don't understand your problem? The grid_size is defined here:

# Compute the voxels coordinates
  grid_coords = get_grid_coords(
      [voxels.shape[0], voxels.shape[1], voxels.shape[2]], voxel_size
  )

It doesn't depend on the objects.

[rockywind]

Dear author, The grid size is 0.25. But some objects grid size drawed in the picture is larger than anthor. I am confused.

[rockywind]

Dear author, Just like the two pictures below. Their grid size is 0.25. But the first picture's grid size looked larger the the second one.

[anhquancao]

Do you have the same voxels.shape? I think the scene will be scaled according to it

[rockywind]

The voxel's shape is 400 400 25 in all scenes, and the voxel size is 0.25. I can't find any scale factor in the code. I found that the grid size is smaller with the object's number increase.

[anhquancao]

Did you set the viewpoint? I think the problem is that the viewpoint was not set. You can follow this post to set the mayavi viewpoint https://anhquancao.github.io/blog/2022/how-to-define-viewpoint-programmatically-in-mayavi/