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.. _customized_visualization:
Customized visualization
-------------------------------------
The usage of Open3D convenient visualization functions ``draw_geometries`` and ``draw_geometries_with_custom_animation`` is straightforward. Everything can be done with the GUI. Press :kbd:`h` inside the visualizer window to see helper information. For more details, see :any:`/tutorial/visualization/visualization.ipynb`.
This tutorial focuses on more advanced functionalities to customize the behavior of the visualizer window. Please refer to examples/python/visualization/customized_visualization.py to try the following examples.
Mimic draw_geometries() with Visualizer class
````````````````````````````````````````````````````
.. literalinclude:: ../../../examples/python/visualization/customized_visualization.py
:language: python
:lineno-start: 37
:lines: 37-44
:linenos:
This function produces exactly the same functionality as the convenience function ``draw_geometries``.
.. image:: ../../_static/visualization/customized_visualization/custom.png
:width: 400px
Class ``Visualizer`` has a couple of variables such as a ``ViewControl`` and a ``RenderOption``. The following function reads a predefined ``RenderOption`` stored in a json file.
.. literalinclude:: ../../../examples/python/visualization/customized_visualization.py
:language: python
:lineno-start: 70
:lines: 70-76
:linenos:
Outputs:
.. image:: ../../_static/visualization/customized_visualization/normal.png
:width: 400px
Change field of view
````````````````````````````````````
To change field of view of the camera, it is first necessary to get an instance of the visualizer control. To modify the field of view, use ``change_field_of_view``.
.. literalinclude:: ../../../examples/python/visualization/customized_visualization.py
:language: python
:lineno-start: 47
:lines: 47-56
:linenos:
The field of view (FoV) can be set to a degree in the range [5,90]. Note that ``change_field_of_view`` adds the specified FoV to the current FoV. By default, the visualizer has an FoV of 60 degrees. Calling the following code
.. code-block:: python
custom_draw_geometry_with_custom_fov(pcd, 90.0)
will add the specified 90 degrees to the default 60 degrees. As it exceeds the maximum allowable FoV, the FoV is set to 90 degrees.
.. image:: ../../_static/visualization/customized_visualization/fov_90.png
:width: 400px
The following code
.. code-block:: python
custom_draw_geometry_with_custom_fov(pcd, -90.0)
will set FoV to 5 degrees, because 60 - 90 = -30 is less than 5 degrees.
.. image:: ../../_static/visualization/customized_visualization/fov_5.png
:width: 400px
Callback functions
````````````````````````````````````
.. literalinclude:: ../../../examples/python/visualization/customized_visualization.py
:language: python
:lineno-start: 59
:lines: 59-67
:linenos:
Function ``draw_geometries_with_animation_callback`` registers a Python callback function ``rotate_view`` as the idle function of the main loop. It rotates the view along the x-axis whenever the visualizer is idle. This defines an animation behavior.
.. image:: ../../_static/visualization/customized_visualization/rotate_small.gif
:width: 400px
.. literalinclude:: ../../../examples/python/visualization/customized_visualization.py
:language: python
:lineno-start: 79
:lines: 79-108
:linenos:
Callback functions can also be registered upon key press event. This script registered four keys. For example, pressing :kbd:`k` changes the background color to black.
.. image:: ../../_static/visualization/customized_visualization/key_k.png
:width: 400px
Capture images in a customized animation
`````````````````````````````````````````````````
.. literalinclude:: ../../../examples/python/visualization/customized_visualization.py
:language: python
:lineno-start: 109
:lines: 111-162
:linenos:
This function reads a camera trajectory, then defines an animation function ``move_forward`` to travel through the camera trajectory. In this animation function, both color image and depth image are captured using ``Visualizer.capture_depth_float_buffer`` and ``Visualizer.capture_screen_float_buffer`` respectively. The images are saved as png files.
The captured image sequence:
.. image:: ../../_static/visualization/customized_visualization/image_small.gif
:width: 400px
The captured depth sequence:
.. image:: ../../_static/visualization/customized_visualization/depth_small.gif
:width: 400px
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