So I have an activator. If I use the vanilla motorcycle model (Vehicles\Motorcycle01.NIF) it makes loud metallic sounds when thrown around (as it bounces off the ground, etc.). If I use a custom motorcycle model (mm\motorcycle_wm.nif) it makes no sound when thrown around.

The custom motorcycle used the vanilla one as a base; I replaced the model and collision model, plus tweaked some of the rigidbody settings.

What am I missing? Does the nif actually control the impact sound? Is it a file name issue?

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Aaand I figured it out. So, the answer was found in bhkConvexVerticesShape. I had used NifSkope's built-in capability to generate a low-poly collision mesh, but doing so had reset the Material/HavokMaterial entry to a default (stone, which New Vegas doesn't seem to have sound for). I changed it to a metallic material entry that made sound in-game.

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Where in NifSkope is the low-poly collision generation?

The easiest way to access it is to right-click the 3D model itself in the model preview area; it's under a ''Havok'' submenu when you right-click. The default rounding is 0.250, but most stuff I've worked on (things about the size of a human) get better results with 1.0-2.0.

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Thanks. :yes: