Source Engine models use up to 3 bone weights per vertex (configurable, but usually 3).
is not a standalone 3D format, you must decompile the associated file into a generic format (like ) before exporting it as an Stack Overflow Phase 1: Extract and Decompile You cannot convert a vtx to fbx
Once you have the SMD files, you need a bridge to a modern format. : The most common free tool for this. Install the Blender Source Tools plugin. Source Engine models use up to 3 bone
The vtx file has no scene hierarchy, no material definitions, and no bone names—only indexed vertices and strips. Therefore, requires a decompilation step. no material definitions