55 lines
2.5 KiB
Markdown
55 lines
2.5 KiB
Markdown
# Europa Model Mesh (.msh)
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> [!WARNING]
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> This document is mostly complete, however some pieces of it are not.
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Europa mesh files are used to store submodel data. They are referenced by .mdl files.
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# Magic/version
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Magic/version is indicated as 2 Windows (CR-LF) formatted lines:
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- `MESH\r\n`
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- `[version]\r\n`
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A file which does not start with the first line SHALL be rejected as a invalid .msh regardless of version.
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The following versions are known to exist:
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| Version | Description |
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| ------- | ------------------------------------------------------------------------------------------------------------------------- |
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| 1.2 | Very early text format. Used by a grand total of one accidentally shipped(?) mesh (RESOURCE.PAK `model\default.msh`) file |
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| 2.0 | Binary format. Used by literally everything else |
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# Version 1.2
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> [!CAUTION]
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> This format is currently not supported by libeuropa, since it can more than likely be imported by hand. Maybe for historic curiousity I'll document it later, but don't expect much.
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# Version 2.0
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### Block
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Mesh 2.0 files use a block structure for lists of information.
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A block consists of a 16-bit unsigned integer of count of items (not bytes!) in that block, then the serialized items themselves.
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A empty block will always be serialized as just `00 00` regardless of type.
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### Mesh piece
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A mesh piece is used to change material or potentionally to split a mesh if it exceeds 64k verts.
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In practice it's usually probably the first one.
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First the material name is read (until a new line character is read). This corresponds to a <!-- FIXME: Write doc --> .mtl material file the game will also parse.
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Next, the following blocks are read and parsed:
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- Vertex block. This block corresponds of Vec3s (your usual float x, float y, float z deal) which repressent each vertex.
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- Vertex color block. Consists of a struct of rgba colors for each vertex.
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- Normal block. Consists of Vec3s which define normal. May possibly not be pressent (normals probably have to be generated then.)
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- UV block. This consists of a set of UV coordinates over all verticies (and there can be multiple UVs, but I haven't fully worked this out..)
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- Face block. This consists of 3 uint16 face indicies for XYZ for each vertex.
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In version 2.0, the mesh file consists of a block of mesh pieces, except there will be at least one in a valid mesh file.
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