generate image files from canvas

[cekees]

Our team is looking for a way to generate image frames (for animations) based on our pythreejs canvas. Would this be a worthwhile thing for us to try adding to pythreejs?

https://stackoverflow.com/questions/15558418/how-do-you-save-an-image-from-a-three-js-canvas

[abelnation]

We actually already generate images from the canvas for the purposes of "freezing" the canvas when it's not in use. So yes, it's possible, and probably not that hard to add.

…

On Tue, Jun 20, 2017 at 8:24 AM, Chris Kees ***@***.***> wrote: Our team is looking for a way to generate image frames (for animations) based on our pythreejs canvas. Would this be a worthwhile thing for us to try adding to pythreejs? https://stackoverflow.com/questions/15558418/how-do-you- save-an-image-from-a-three-js-canvas — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#106>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAMNduZ4UqsKhk72izyB94LcHL1TxMAoks5sF-QSgaJpZM4N_wDc> .

-- Abel Allison abel.allison@gmail.com

[elPistolero]

I'm trying to implement this.
From what I understand I need to register a callback in Renderer.py:

self.on_msg(self._screenshot_ret_val)

And in Renderable.js I have a screenshot function that sends data back to the python side:

this.send({
    type: '...',
    method_name: 'screenshot',
    ret_val: ...,}, this.callbacks(), null);

However, I'm unclear on how ret_val needs to be packaged. I tried to set ret_val: this.renderer.domElement.toDataURL(), but then session.py complained that it could not handle a string and was expecting a byte object.
Are there some js functions I can call with exec_three_obj_method that actually return something so that I can gain a better understanding on how the communication from javascript to python is supposed to work?
I tried calling localToWorld from Object3D.js but that method could not be found.

[maartenbreddels]

see also my comment here