Need help with fitment and joining/combining two objects!

[Anonymous]

Hello!I made a spoiler for a car, but the fitment doesn't match the trunk. I'm a complete newbie to this, so I would love to get some assistance, because I don't know how to make it so the spoiler sits smoothly on the trunk without colliding with it! Here's a pic of how it looks, and I added my project below as well for anyone interested in helping! Any tips or help is highly appreciated!

[TrippyLighting]

This looks like the same 3D model you posted yesterday and it isn't exactly a beginner project.

My advise would be the same. Model the spoiler in box-view mode and change to smooth-view mode for checking. You have very many self-intersecting polygons in that model so it is unlikely going to convert into a solid body or surface body.

You are aware that your timeline is turned off because you are working on an imported model ?

That isn't necessarily a bad thing f you are working with T-Splines only (in that case it can actually be quite helpful)  but if you are starting to work with surfaces and/or the tools in the Model environment you might want to consider turning the timeline on.

There are several ways this can be "matched". You can convert the trunk mesh to a T-Spline and then into a surface body or solid body. Then, if you spoiler is a solid body you can combine-cut the trunk and the spoiler.

The mesh you downloaded was modeled in a Sub-D mesh modeling software such as Modo, Maya, 3DS Max, Blender etc. This mesh is not the original mesh o the Sub-D control cage it is the already subdivided mesh. That means the original mesh has already be subdivided in the originating software likely using catmul-clark subdivision (or open subdiv).

That mesh/model you imported into Fusion 360. Because it is a quad mesh (no triangles) it can be converted not a T-Spline and then into a solid body or surface body. These sort of meshes are almost always modeled for visual representation, so they are not closed (water tight) so they convert into a surface body.

You can now model your spoiler and then, after you have modeled the T-Spline convert the spoiler into a solid body and use the trunk surface to split that solid body. The split surface then will match the trunk perfectly.