Event Listener for Stationary Camera

My colleagues and I are working on some Python code which includes a heads up display containing information about the model.

We'd like for the HUD to only appear when the user is not moving the viewport around, or, in other words, when the current viewport camera is stationary for more than, say, a couple seconds.

Is there a way to listen for an event like a stationary camera?

Replies to This Discussion

Permalink Reply by Andrew Heumann on October 29, 2014 at 4:29pm

doing such a thing requires - if I'm not mistaken - a bit of fancy footwork. There are events associated with camera motion - but in order to evaluate that a camera has NOT moved, you'll need to start a timer going in a background thread after every camera move that gets reset whenever the camera moves again - and once that timer hits a time threshold it triggers some delegate function.

Disclaimer: I know very little about event handling and even less about threading! so this could all be 100% wrong.

Permalink Reply by Dan Taeyoung on October 29, 2014 at 5:39pm

Yes, it's possible. You could use the data dam and a camera component in order to do that; comparing the buffered data from the data dam with the current data would return false only when the camera is moving.

Here's a gif attached:

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hud_on_camera_move.gif, 456 KB

Permalink Reply by Dan Taeyoung on October 29, 2014 at 5:41pm

Although, upon rereading your question, it looks like you're doing it in python. You could activate the python component via the boolean returned, in that case.

Permalink Reply by Anders Holden Deleuran on October 30, 2014 at 4:13am

I've attached a version using GHPython to get the camera location of the active viewport and a subsequent component which uses the sticky to store this vector and check the difference between the stored and the current vector. I think it should be possible to develop this logic within the same GHPython component. Hope that helps get the ball rolling :)

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