Patch tool, (Error: The operation failed. Try adjusting the values or changing the input geometry.)

[elijahcha]

I'm trying to patch the bottom of this car design, but It keeps saying

"Error: The operation failed.
Try adjusting the values or changing the input geometry."

Any ideas on how to sort this out?

[laughingcreek · Accepted solution]

hard to say without seeing the model (file\export as .f3d and attach)

you will possibly need to add some interior rails and/or patch it in smaller bits.   

It looks like the surface may have originally been a tspline/form body.  surface quality close to star points can also cause surfacing features to fail.  It looks like you may have a few right along the edge.  Will be able to help more once we see the model.

[elijahcha]

Ok, yes I made it using T-splines then converted it to BRep. I've now attached the file.

Thank you

[TrippyLighting · Accepted solution]

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@laughingcreek wrote:

hard to say without seeing the model

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It's pretty easy to say. The reason is almost always the same.

1. Trimming the bottom and rear of a T-spline with a spline (probably a fit-point spline) will almost always exhibit curvature problems.

2. Trying to 'fill" the entire bottom with a single patch, even if a patch would be created is almost 100% certainly no going to result in "flat" surfaces.

etc.

[elijahcha]

Thanks everyone, I fixed it by removing the small curves behind the wheel and that seemed to fix the problem! 😄

[TrippyLighting · Accepted solution]

I did not have a chance to look at the model earlier. Nicely modeled!

I still would be very careful with some of the workflows.

For example, for the front lamps, you create a T-spline body, which you use to trim another T-Spline.

This kills the curvature of edges and can lead to modeling problems down the line. Might be Ok for this model, but I would not use that technique for production-ready product design.

[elijahcha]

Thanks for the advice, after all, I'm just doing a small project to practice using tools in Fusion 360.

I quite like the outcome of it. Thanks, everyone! 😄