#### NIFF 1.0 Specification

## 3. Binary Format

### 3.17 CollList

#### 2) CollGroup Area

> The CollGroup area has several Coll nodes stored as a group. Even if there is only one Coll node, it belongs to a CollGroup. The memory map for CollGroup is as follows.

CollGroupHeader | u32 | coll_group_tag
u32 | this_coll_group_index
u32 | coll_group_header_size
u32 | coll_group_size
u32 | coll_group_name_index
u32 | coll_num
u32 | nintendo_extension_block_size
u32 | user_extension_block_size
u32 | coll_num_byte(0)
...
u32 | coll_num_byte(cull_num - 1)
| Coll(0)
...
Coll(coll_num - 1)
NintendoExtensionBlock
UserExtensionBlock

CollGroup Area Memory Map

u32 coll_group_tag | Tag indicating CollGroup
    TAG_COLL_GROUP  0x000d1000
u32 this_coll_group_index | Index number of this CollGroup
u32 coll_group_header_size | Size of this CollGroupHeader
u32 coll_group_size | Size of this CollGroup
u32 coll_group_name_index | Specifes CollGroup name by index number
u32 coll_num | Number of Coll in this CollGroup
u32 nintendo_extension_block_size | Nintendo extension block size
u32 user_extension_block_size | User extension block size
u32 coll_num_byte | Number of bytes of each Coll
Coll | Actual collision data
NintendoExtensionBlock | Nintendo extension block
UserExtensionBlock | User extension block

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