topic Re: Patch preview showing insane surfaces in Fusion Design, Validate & Document Forum

Patch preview showing insane surfaces

matthewrjacobs — Sun, 01 May 2022 22:01:28 GMT

Since the last update I have run into a couple of issues with the patch command.

1st Problem:

When using Patch, if I try to use tangent or curvature I'm getting a preview surface like the one below. I recalled a friend running into the same issue, but when he hit OK the actual surface is fine. So, I tried this and it worked, but it isn't ideal.

Below is the preview surface, and the computed surface below that. I probably scrapped 100 surfaced this weekend because of this.

2nd Problem:

I have had to hit Ctrl+B to get some surfaces to show up. meaning, I hit OK and the timeline shows a feature, but no surface on the screen. If I compute all, it shows up. I never had to to this before the update.

Preview

Computed

Re: Patch preview showing insane surfaces

stiller.design — Mon, 02 May 2022 05:41:36 GMT

simplify and extend the profile. split the surface later on to the desired shape

Re: Patch preview showing insane surfaces

aliobidi — Mon, 02 May 2022 07:26:37 GMT

Hi,

I just fixed it for you
I just fixed the Yellow sketch warning
your file below

Re: Patch preview showing insane surfaces

TrippyLighting — Mon, 02 May 2022 15:42:25 GMT

When I open the file you attached and edit the patch in question I see the same strange surface @matthewrjacobs posted about.

Re: Patch preview showing insane surfaces

TrippyLighting — Mon, 02 May 2022 15:47:25 GMT

I cannot comment on why Fusion 360 creates these strange surfaces sometimes. This is is only a preview problem so the actual generated surface seems to be OK.

However, this is a tricky shape and I'd be tempted to model this using T-Splines rather than trying to do this with surfacing techniques. It's not that it cannot be done, but it requires a lot of experimentation with different loft approaches.

There are at least two edges where you have connectivity but not even tangency:

Re: Patch preview showing insane surfaces

matthewrjacobs — Mon, 02 May 2022 23:26:31 GMT

@aliobidi, I should have prefaced this with I'm only concerned about the Component named "Top" , I'm aware that some of the other components are broken. I'm reusing components from other files which reference other geometry, and haven't gotten around to fixing them yet.

@TrippyLighting, thanks for pointing out the continuity errors, the one in the back was just a brain fart, the one's by the neck were because of the preview errors. I've corrected them.

Re: T-splines, I may give it a go, but I've use surfacing techniques for this in the past with success, just never have to deal with the preview error before.

@jeff_strater, Can you guys please have a look at the preview rendering issues I'm seeing.