pythreejs | A Jupyter - Three.js bridge | Graphics library

It took a few days, didn't get cadquery working properly, neither the code from your first question on this topic without cadquery The code here made it possible to look at the issue...

The jumping happens because orbit.update() for target does not occurs and the function update() is not available in python; only in c++ or c#, etc. From the docs:

When animating the camera rotation above, we used the camera’s quaternion . This is the most robust method for animating free-form rotations. For example, the animation above was created by first moving the camera manually, and then reading out its position and quaternion properties at the wanted views...

The text can be found here on page 12. And also discussed here at github.

However, the jumping can be reproduced in IPython if you apply the following:

renderer = Renderer(scene=scene, camera=camera, controls=[orbit], position=target, width=view_width, height=view_height)

here position is added with target coordinates [0, 5, 0] but the update for this is only done when you mouse-click and adjust to position of the cube/camera. The jump is similar/equal to the jump as seen in the export.HTML.

Conclusion: the programmed camera position is seen as a jump after manual interference due to the absense of the .update() function of the OrbitControls python class and thus not a bug or mistake.

Update 1 - Ipython Renderer output while not ran in jupyter-notebook: