How to get rid of dark (thick) lines mesh?

[Anonymous]

I have made a design for car body part. As shown in the picture below, there are dark (thick) lines visible. Does anyone know how to get rid of them? 

[jodom4]

Hey infoG2FFU,

I think what you're seeing there is mesh surfaces overlapping. What are you trying to do with the mesh? This type of geometry is generally not advised for work in Fusion 360. In most cases, we recommend rebuilding the surfaces with Patch tools.

[Anonymous]

Dear Jodom,

Thank you for your reply. I thought I answered, but apparently my answer didn't send.

I think you are right about the overlapping mesh part. What I did was the following: I am currently designing a car body part. I was doing this by merging two different car body parts I had found on the internet. But because the parts did not overlap nicely, I patched the "holes" by using the loft tool. So the "thick lines" are actually patched surfaces.

Initially, the parts I had downloaded from the internet were meshes. I converted these meshes to BREP's before I started working on them. I also tried to convert them to T-splines so I could work with them better. But I did not manage to get that working.

I also want to mirror my final mesh, but this is not working.

What are your thoughts?

Kind regards, Ewoud

[mavigogun]

Autodesk offers a great free product (FREE!) for handling meshes- and you're gonna love the name:   Meshmixer.    One of the demos for the product takes the head off a duck and puts it on a bunny.    You can find it here:

http://www.meshmixer.com/

Of course, like anything, there is a learning curve.   Judging from the manor in which those meshes seem to have been cut prior to the Lofting attempt, I suspect a lack of familiarity with the tool.    I reckon Meshmixer will be a great help for combining those forms, if that is how you decide to confront the challenge.    Otherwise, if determined to use Lofts, fashioning the parts to present clean edges for Lofting seems critical; you might switch to the Patch Workspace, Split  the edge Faces to provide well-matching transitions, and then get to the tedious work of Lofting all those many, many facets.   Frankly, it sounds like a nightmare- and advanced work.

Another rout is to convert those Meshes into quads as a transitional step towards T-Spline to BRep conversion- allowing for, perhaps, some nice contiguous curves.   Again, advanced work.    That said, here's a narrative of the process:

[Anonymous]

Thank you for your reply. I have tried something similar as you are suggesting. But you also provided me with a lot of new information I didn't know yet.

I already tried to use meshmixer and I also already tried converting it to a quad-mesh. But my model gets "destroyed" when I do that. Unfortunately I cannot show you a screenshot right now. I have time for this on Sunday night. I will upload a screenshot with the issue I have then. I will then also try to fix it with the ideas you gave me. I will let you know when I fix my issue (Y) 

[TheCADWhisperer]

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@Anonymous wrote: 

…. parts I had found on the internet. 

What are your thoughts?

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My thought is to use the downloaded mesh geometry only as reference in recreating from scratch proper geometry, then delete the mess, err, I mean mesh geometry.

[mavigogun]

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@Anonymous wrote:

I already tried to use meshmixer and I also already tried converting it to a quad-mesh. But my model gets "destroyed" when I do that.

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Ya, in my experiments since posting, from exporting  from ReCap to Conversion to T-Spline, a number of deformations were introduced.    I'll explore the workflow for cause.

[Anonymous]

I notice now that the extensive answer I wrote did not upload. I am not sure when I have time again to work that out again. I will do this as soon as I can (but this might take a week!)