UNWANTED SKETCH ENTITIES ADDED AUTOMATICALLY

[Anonymous]

I have encountered this problem to varying degrees since I started using fusion, but today the problem is bad enough that I have decided to actually see if there is anything that can be done about it. I'm not sure if it's a software problem, or a problem with computer on which I have Fusion installed, so any advice would be appreciated.

When I draw sketches; I only recall this happening whilst using the 'line' tool, I will click on the point from which I wish a line to extend, but an extra line is added prior to the line that has been drawn to the dimension required, meaning that the line will be longer than necessary. The extra line occurs as I click the point of origin then move the cursor in the direction in which the line is to extend, and it is often quite short and easy to go unnoticed until a significant amount of sketching has been done, only to realise that the addition of this line has caused the geometry to be totally incorrect. On other, less frequent occasion, the same thing has occured, but instead of a line being drawn, an arc is drawn. I understand this is an integrated feature of the 'line' tool, and I am aware of how to use this function, but on the occasions where this has happened, the cursor was not moved in such a way.

Does this happen to any one else? My computer isn't exactly new, and the hardware limitations aren't much beyond the minimum requirements for the Fusion system, so I could understand if there wasn't much that could be done, but I'm fairly certain the system was updated at the end of last week, and the increased occurrence of this issue seems to correspond with that update, so I thought I would ask on here and see if it had anything to do with software bugs.

Thanks for your time if you read this.

[g-andresen]

Hi,

I am familiar with the phenomenon.

That is why I just tried to reproduce it, and could observe the effect several times, but I cannot see a clear connection between action and effect. At the moment I can neither confirm nor exclude without doubt the cause PC.

günther

[Phil.E]

Turn off auto project. This is in preferences, under the menu that has your name on it, top right corner of Fusion.

[g-andresen]

Hi Phil,

the described behaviour occurs independently of the mentioned setting, and not always.

günther

[Phil.E]

Can you post a screencast video of this? 

[Anonymous]

Yes, it is strange, it doesn't always happen. I haven't tested with various different settings, but there are some that I have changed on occasion and noticed that it has no impact on this occurrence.

I have attached a screen cast, hopefully this will show you in detail what I have described; bearing in mind that when the line tool is activated, the origin point has been selected and the cursor is moved to the left, the horizontal line that is generated was not selected, no other 'mouse clicks' were performed, and yet the line has been placed.

Sometimes this phenomenon will happen consistently, making the drawing process particularly frustrating, sometimes not at all. The components I tend to draw are of a fairly small size, dimensions are usually between a 1/8th to 1/2 an inch. I'm sure I notice this happening more when drawing at smaller scales.

https://knowledge.autodesk.com/community/screencast/009b33e8-3ef4-4231-b4bd-dc3d446d998f

[Anonymous]

https://knowledge.autodesk.com/community/screencast/009b33e8-3ef4-4231-b4bd-dc3d446d998f

[g-andresen]

Hi Phil,

here  is a recording of the behaviour  ( 0:09)  as i just experienced it.

As already mentioned, sometimes the effect happens only once, occasionally but also several times in a row.

günther

[wmhazzard]

That comes from dragging the mouse while in mid click. If you click and hold then move the mouse you will draw a line until you release the button click just like when drawing an arc from a straight line. 

[Anonymous]

I can assure you that I'm not clicking and dragging, or even clicking and the moving at a particularly high pace, but if this is this case then it would indicate some sort of lag, a delay in the recognition of the click prior to movement of the cursor. I couldn't say whether this is a software, hardware, or connectivity issue. When this occurs you can usually see some sort of a delay in the cursor (there are changes that indicate an origin is selected and that a line is being drawn).

So I'm still unsure as to whether or not this could be classed as a bug, and if there is no fix other than possibly a hardware upgrade it would still be good to know. I'm using Fusion professionally and I'm not comfortable with the risks this issue poses for the models being generated having incorrect geometry; and this problem, being fairly subtle, is quite easy to miss.

[jeff_strater · Accepted solution]

@Anonymous - we have investigated this issue in the past.  @wmhazzard is technically correct - these artifacts come from mouse events that is recognized by the system as a move, and passed onto the line command.  I've noticed that this issue quite tightly correlated to which input device I'm using.  Some computer mice seem to send more events based on very small movements, that you might not even realize are happening.  

As to whether this is a bug or not, that is debatable.  You could argue that Fusion should filter out these events, but it become a bit difficult to determine what is a valid mouse event and what is an invalid event.  Because most people do not see these problems, we have hesitated to try to fix this on our side.  I suggest that you try different input devices to see if that helps.

[Anonymous]

Oh right, I see, that makes sense. What do you mean by 'input devices'? Do you mean, for example, to try a different mouse? The one I'm using is a cheap standard infra red mouse, I don't use any other pads or joysticks for design, I work with fairly simple geometries for the most part.

Thank you for your help, and to everyone who contributed or paid attention to this thread.

[Phil.E]

Definitely try another mouse. My personal favorite is over a decade old Dell 3 button (with wheel) USB mouse. These are commonly available in thrift stores for a couple bucks. The reason I mention it is that for little money you could try a different mouse just to compare. There are specifically CAD mice out there, 3Dconnexion makes a good one.

[Phil.E]

If you put Screencast on 0.5 speed, and watch closely, the mouse is moving the entire time the unwanted line is drawn. It starts moving as the first click is registered. This would be interpreted as a drag.

[davebYYPCU]

You can log me as one who figured this was mouse sensitivity, annoying when you see it happen, worse when you have go check because you didn’t see it (when it happened).

I don’t think it’s random, and I do try to slow down to hardware speed.  I thought about changing mice, but hasn’t happened yet.