#### NIFF 1.0 Specification

## 3. Binary Format

### 3.11 TriList

#### 3) Reference VtxData Area

When TRI_ANIM_VTX_FULL is specified

u32 | vtx_group_index(0)
...
u32 | vtx_group_index(tri_anim_frame_num)

Reference VtxData Area Memory Map

u32 vtx_group_index | Index number of VtxGroup area to be referred

When TRI_ANIM_VTX_KEY is specified

u32 | vtx_anim_key_num
u32 | vtx_anim_key(0)
...
u32 | vtx_anim_key(vtx_anim_key_num - 1)
u32 | vtx_group_index(0)
...
u32 | vtx_group_index(vtx_anim_key_num - 1)

ReferenceVtxData Area Memory Map

u32 vtx_anim_key_num | Total Number of keyframe animation keys.
u32 vtx_anim_key | Key frame value
u32 vtx_group_index | Index number of VtxGroup corresponding to key.

When vertex animation is not performed

u32 | vtx_group_index

ReferenceVtxData Area Memory Map

u32 vtx_group_index | Index number of VtxGroup to be referred

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