Sketch mode drops mouse tracking

[lure23]

Video: why not follow

The motion should be smooth and keep tracking the mouse cursor, right? I had the button pressed down, but within a short, variable time, Fusion 360 Sketch mode decides it's enough and won't continue tracking the mouse any more.

This must be a bug.

Hardware: Apple Macbook Air Core i7, HD 3000 graphics, 4GB memory

Only Fusion was running while recording this.

[NicolasXu]

Hi Asko,

Thanks for letting us know the issue.

It sounds like a performance issue. Would you provide more information about which situation you see the problem in? Create new geometries, or move geometries, or something else? Is it a simple sketch or complex sketch? A video would be much intuitive for us to detect the problem. 

Best Regards,

[lure23]

Link to video is there on the first line, but due to the way the Forum style kind of hides them (we've discussed with Kat) it's easy to miss.

I don't think it's a performance issue. That's also what I initially expected, so I closed all other apps. I will test on another Mac today to be sure.

It's a simple sketch. I expect the fact that the line crosses over the circle (see the video), which causes sections to be calculated I guess, can lead you to the solution. I'm pretty sure it's a thing within the Fusion 360 code base that can be fixed. i.e. while a person is dragging a point sections don't need to be calculated.

[NicolasXu]

Oops, I missed it.

Yes, it’s an interesting case. I will discuss with the development team for the behavior.

When you test it, can you try dragging the line segment near the end point instead of dragging the end point, to see if there is any difference?  

[lure23]

I find it interesting, as well.

I've tried pulling the other end of the line to make it  move, and the behaviour is the same.

[lure23]

Okay, tested this on another Mac (Macbook Pro Core i5 with dual GPU).

- tracking still drops if held from the dot on the circle (= left end)

- worked fine when dragging from the other (right) end; however managing the movements of the part are more difficult this way

I think this was still running with the Core i5's "onboard" HD 3000 GPU (the same as my Macbook Air has). Will try later today with the dedicated AMD GPU to see if it is GPU type specific.

[NicolasXu]

Thanks for all the testing and the information, Asko!

I can see the similar behavior on my Windows machine with NVIDIA GPU, so it seems not a GPU type specific issue.

I have reported it to the development team for further investigation.

Meanwhile, there are two workaround may be helpful. You may check if it works for you: https://dl.dropboxusercontent.com/u/73595450/SketchDragging.mp4

-   0”-11”: Drag the end point. When starting the dragging, firstly, quickly/suddenly dragging the left end point for a distance. (I suspect the issue is related to constraint inferring. This workaround is to ensure the inferring doesn’t get triggered.)

-  12”-24”: Drag the line. Select the line (not the left end pint) close to left end and drag.