How to Render Mesh with Textures using low-level Visualizer class

Hi there,

I would like to render & animate a mesh object that has moving sub parts.

Is there a way to render mesh with textures via low-level [Visualizer](http://www.open3d.org/docs/release/python_api/open3d.visualization.Visualizer.html)? I couldn't see any related property/function to pass material.

I've already tried [python example](https://github.com/isl-org/Open3D/blob/master/examples/python/gui/textured-model.py) that uses [O3DVisualizer](http://www.open3d.org/docs/release/python_api/open3d.visualization.O3DVisualizer.html), however animating with draw() function is quite slow.

Any feedback would be greatly appreciated!

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Here is an example of adding a mesh geometry object (without the texture):