Scene viewer as a widget in a window

[wkentaro]

To use SceneViewer as a widget in a window (for real application with buttons, labels, and additional image widgets), glooey looks good.
(trimesh.SceneViewer is a pyglet.Window by itself, so we can create multiple windows but we cannot tile multiple SceneViewer in a single window.)

Does anyone know any other options?

---

In glooey, it creates pyglet.Window and add Widgets (e.g., glooey.Image) to that.
So, in order to render trimesh.Scene or trimesh.Trimesh in a widget, we need creates a custom widget (e.g, TrimeshSceneViewerWidget), which is similar to trimesh.viewer.SceneViewer.

Here is a workaround of this (actually it still doesn't work): https://gist.github.com/wkentaro/d8cc30c6634389db02ba53adb7b934b2

[mikedh]

I played with this briefly- glooey looks awesome! Heh I tried their example, but just replacing the window like:

import trimesh
from trimesh.viewer import windowed
mesh= trimesh.load('models/featuretype.STL')
window = windowed.SceneViewer(mesh.scene(),
                              start_loop=False)

And it didn't work immediately. The widget would be a nice abstraction for sure, seems like it would however require a lot of re- implementation.

[wkentaro]

At least, below example does work, right?

#!/usr/bin/env python

import glooey
import pyglet
import trimesh
from trimesh.viewer import windowed

mesh= trimesh.load('models/featuretype.STL')
window = windowed.SceneViewer(mesh.scene(),
                              start_loop=False)

gui = glooey.Gui(window)
pyglet.app.run()

But it doesn't work with other widget like glooey.HBox. I'm working on this by asking the developers of glooey: kxgames/glooey#24.

[wkentaro]

I successfully implemented the widget that visualizes trimesh's scene object.
https://github.com/wkentaro/trimesh-glooey/blob/master/scene_widget.py

If you run this script, the window looks like below:

It supports multiple trimesh scenes visualized on a single window, which is desired when we create a single-window application.
What do you think of adding this widget to trimesh with an optional dependency on glooey?

Another thing, this is a bit out of the scope of this issue, but I felt pyrender.Trackball is quite easy to rotate the camera compared to trimesh.transformations.Arcball.
That's why I use pyrender.Trackball in the above script.
I think that would be great if we integrate pyrender.Trackball into trimesh if it's license-ok. What do you think of this?

cc @kalekundert

[mikedh]

Oh neat! Yeah definitely, maybe included as something like:
trimesh/viewers/widget.py
Then main as:
examples/widget.py

What do you think? Your example looked pretty much ready to go, though if you could add a few docstrings it would be nice.

With regards to including pyrender.trackball as something like trimesh.viewers.trackball, or trimesh.scene.trackball, sounds great to me unless @mmatl objects (license is compatible). It doesn't have any external dependencies and looks better than trimesh.transformations.Arcball for sure.

[wkentaro]

Nice. First of all, I sent PR about Trackball here: #381

[mmatl]

I'm totally cool with it, of course! Feel free to copy code over as needed.

[wkentaro]

Thanks, @mmatl !

[mikedh]

Added in #387. Thanks for the PR!