Hi! I have been working on a toy car for my class and have been running into some issues. It started off as a subd, I mirrored it, joined, turned into nurbs, and then have been building off of it ever since. I offset it which did cause it to have a few pieces sticking out that I’m not sure how to fix. I am wanting to boolean difference but I am unable to do so, I went to showedges and it looks like on the backside of the car there are a few naked edges. I tried cap, mergealledges, then changed it to mesh so I could repair it which did not help. I made it an stl so I could repair it too, and that didn’t work. When I checked it the back had a giant gap in it. Any help would be great, I will leave the 3dm file down below.
The panels across the back of the car overlap slightly at the centre. Then the fillets across the bottom of the window opening meet at the centre. That means the panel and fillet edges are different lengths so they won’t join. Make the pieces consistent and that will allow you to close the polysurface. There is a similar issue at the top of the rear window.
You can use surface extract to separate the fillets from the surfaces that surround them, then scale the fillets so their edges match the adjacent edges, then rejoin them.
The overlaps may be a problem and prevent the creation of a closed polysurface. I can’t be sure on a quick glimpse, particularly as I don’t understand the design intent of the ridge that seems to run all around the midline of the car body. One approach, if it doesn’t have undesirable side-effects and the overlaps exist all the way round, not just at the back, would be to split the car along that centreline and move each half outwards half the overlap distance, so the pieces then abut.
Setting the plane of symmetry on a cplane, such as the xz (y=0) plane, provides many benefits compared to using something like 1-3/8". I advise moving the model so that the plane of symmetry is on the world xz cplane.
A simple and very accurate method to eliminate the overlap on the center plane is to use SetPt command.
Turn off the layers with spare tire and wheel.
Explode the polysurfaces.
Hide the surfaces which are full width, such as the bumpers.
Turn on control points of all surfaces with edges which should be at the center plane.
Select all the control points close to the centerplane
SetPr command with only y checked. Type in the y value corresponding to the center plane (0 if you have moved the model).
Check that the center plane edges now align.
Join, etc.