Reference model

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Reference.mdl

The Reference.mdl, conventionally named <modelname>.mdl, contains a range of key information for an in game model:

• The model's Origin, which is used to align its rendermesh (VTX), collisionmodel (PHY), gibs, etc to the Model Entity's position in the World.
• The names of any sound WAV files used by this model.
• The names of the VMT files to use as Skins. (or is this in VTX / VVD files ?)
• The name of the PHY file to use as a collisionmodel.
• The names of the MDL files used to store animations.
• etc

Reference.smd

The reference.smd, conventionally named <modelname>_ref.smd, contains some of the information that goes into the reference.mdl, but not all of it:

• Skeletal bone hierarchy (nodes) and "idle" bone coordinates (skeleton)
• Render Mesh origin, vertex and UV map coordinates (for lod_0)
• Filename of the default Skin VMT(s)
• etc