83 lines
1.9 KiB
Markdown
83 lines
1.9 KiB
Markdown
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# MSH
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Файл `*.msh` является NRes-контейнером. Geometry, узлы, slots, batches,
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animation и служебные streams лежат в entries с разными `type_id`.
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## Entry map
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```text
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type 1 nodes and slot selection
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type 2 header 0x8C + Slot68 records
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type 3 positions float3
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type 4 packed normals
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type 5 packed UV0
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type 6 index buffer u16
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type 7 triangle descriptors
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type 8 animation keys
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type 9 service stream
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type 10 strings and node names
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type 13 Batch20 records
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type 15 auxiliary stream
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type 17 auxiliary data
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type 18 rare stream
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type 19 animation frame map
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type 20 rare auxiliary table
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```
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Reader ищет entries по type, но сохраняет исходный порядок для roundtrip.
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## Node and slot selection
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Type 1 обычно состоит из records по 38 bytes:
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```c
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struct Node38 {
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uint16_t hdr0;
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uint16_t parent_or_link;
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uint16_t anim_map_start;
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uint16_t fallback_key;
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uint16_t slot_index[15];
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};
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```
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`slot_index[lod * 5 + group]` выбирает geometry slot. `0xFFFF` означает
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отсутствие геометрии для комбинации LOD/group.
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## Slot and batch
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Type 2 содержит header `0x8C`, затем `Slot68`:
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```c
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struct Slot68 {
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uint16_t tri_start;
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uint16_t tri_count;
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uint16_t batch_start;
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uint16_t batch_count;
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float aabb_min[3];
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float aabb_max[3];
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float sphere_center[3];
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float sphere_radius;
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uint32_t opaque[5];
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};
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```
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Type 13 задаёт draw ranges:
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```c
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#pragma pack(push, 1)
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struct Batch20 {
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uint16_t batch_flags;
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uint16_t material_index;
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uint16_t opaque4;
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uint16_t opaque6;
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uint16_t index_count;
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uint32_t index_start;
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uint16_t opaque14;
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uint32_t base_vertex;
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};
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#pragma pack(pop)
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```
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Index check выполняется как `base_vertex + index < vertex_count` для всего
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используемого slice.
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