Geometry projection severely affecting file loading performance

[Intuos5]

Last week, I stumbled upon something quite interesting, so I'll share the files here. This performance issue happened on both files, V1 and V2 despite having been made in a slightly different manner. When I project the surfaces highlighted in Projection.png Fusion requires ~15-30 minutes to compute the to projected lines. However, this is not all there is to it, because loading the file after saving the projection causes the load times to increase to the values of the computation time. How come this is the case, since the projected lines are basically offset splines that were trimmed?

[Beyondforce]

Hey @Intuos5 ,

I have just tested the files and I can't see any problem!

Could you please create a screencast and show exactly what you are doing?

Ps.

What is your computer HW specs?

Cheers / Ben
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[Intuos5]

My computer specs shouldn't be a problem: 7th gen high-end Intel mobile quad core, Geforce GTX 1070, NVME SSD and 32GB RAM. 

I've added a screencast, if I were to let Fusion solve the computation and save the file to the cloud, close it and re-open it that's when the file drastically increases in load time. 

Thanks for taking the time to check it out!

[Beyondforce · Accepted solution]

Okay, I see what's the problem... In theory the way you projected those surfaces shouldn't have worked since those surfaces are not flat - they are wavy. For some reason, the normal project command "Acted" like the "Include 3D geometry" command, but it's not supposed to! - This is a bug!

Solution: When dealing with 3D geometry, you should use the "Include 3D geometry" project command. If you do that, it will work perfectly.

@jeff_strater - Will you please forward this bug to the right team? Thanks.

@Intuos5 , Please let me know if you have more questions.

Cheers / Ben.

[Intuos5]

---

@Beyondforce wrote:

Okay, I see what's the problem... In theory the way you projected those surfaces shouldn't have worked since those surfaces are not flat - they are wavy. For some reason, the normal project command "Acted" like the "Include 3D geometry" command, but it's not supposed to! - This is a bug!

Solution: When dealing with 3D geometry, you should use the "Include 3D geometry" project command. If you do that, it will work perfectly.

@jeff_strater - Will you please forward this bug to the right team? Thanks.

@Intuos5 , Please let me know if you have more questions.

Cheers / Ben.

---

I'm not sure whether the surfaces aren't entirely flat, since I recall making the surfaces as extruded splines in the first place. So they are wavy horizontally, but supposed to be flat in vertical direction. Nevertheless, I forgot about the Include 3D command while working on this file, good call.  Thanks again!

[laughingcreek · Accepted solution]

Fusions's difficulties with computing this projection might be a bug, but the way the projection is working isn't.   The regular sketch projection will try to project the silhouette of what ever you select.  Your selecting the face instead of the edge.  by selecting the edge a lot of extraneous information is included b/c it's trying to project the silhouette of that face.  include 3d is only working for you because that edge happens to lie on the sketch pane you want it on.  if you use the regular project on just the edge, do you still experience the same problems?

the screen cast illustrates what I mean.  when I project the face, you can see there are multiple projected lines lying on top of each other.  this might be desirable if I intend to change the angle of the face being projected.  but if I project just the edge I don't get the extra lines.

https://knowledge.autodesk.com/community/screencast/c3e983b3-6b3d-4962-85dc-f0fda33b2807

[laughingcreek]

correction, when projecting a face it will try to project ALL the edges of the face, all the way around, not the silhouette.  that happens when projecting a body.

[Intuos5]

Projecting the bottom edges of the face or using include 3D geometry both do the trick. I was not aware that projecting a faces actually projects all the edges of the face. I really like the information both of you provided!

Regardless of this, Fusion shouldn't have such a hard time opening a file with a wrong projection, should it? Have you tried saving the file with the faces projected (after waiting for Fusion to solve them first...) and seen the difference it takes when loading the file?