OBD:OTLF
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Main Page >> Oni Binary Data >> File Types >> OTLF File
Oct Tree Leaf Node Array - Level File
| Hex | Translation | Meaning |
| 01 45 02 00 | 581 | 00581-.OTLF |
| 01 00 00 06 | 3 | level 3 |
| AD DE | dead | not used |
| 03 49 00 00 | 18691 | 18691 packages follow (one package is edged in black) |
| Below follows the first package. | ||
| 00 00 00 00 | 0, 0 | Bits 0-11 (12 bits) contain the number of gunk quads that intersect this leaf, bits 12-31 (20 bits) contain the index of the gunk quad list. See details below. |
| FF FF FF FF | -1 | negative x neighbour |
| 01 00 00 80 | 1, high bit | positive x neighbour |
| FF FF FF FF | -1 | negative y neighbour |
| 02 00 00 80 | 2, high bit | positive y neighbour |
| FF FF FF FF | -1 | negative z neighbour |
| 04 00 00 80 | 4, high bit | positive z neighbour |
| 7F FE FC 39 | 7, 127, 127, 127 | Bits 0-8 (9 bits) contain the index of max x, bits 9-17 (9 bits) contain the index of max y, bits 18-26 (9 bits) contain the index of max z and bits 27-31 (5 bits) contain the index of the size of this leaf. See details below. |
| 00 00 00 00 | 0 | Bits 0-7 (8 bits) count of something, bits 8-31 (24 bits) index of something. See details below. |
- Intersected gunk quads
- An octtree leaf (OTLF) stores its size and position and the gunk quads that intersect it. The first field contains an index/count pair that is used to access the first IDXA field that is stored in the AKOT that owns this leaf. This IDXA contains the gunk quad numbers that intersect the leaf.
- The last field also contains an index/count pair and that one is used to access the second IDXA field of AKOT but what this IDXA contains is currently unknown.
- Position and size
- The position (of leaf's positive corner) is stored as three 9 bit fields. These values are not the x, y and z coordinates themselfs but they are indexes into a constant table. This constant table has 512 entries starting with -4080.0 and going up to 4096.0 in 16 units increments. The size of leaf is stored in a 5 bit field and it is and index into another constant table. This table has 9 entries starting with 16.0 and going up to 4096.0 (each entry is double the previous one). All this leads to the facts that the maximum environment size is (8192.0, 8192.0, 8192.0), the minimum coordinate is (-4096.0, -4096.0, -4096.0) and the maximum coordinate is (4096.0, 4096.0, 4096.0). The minimum leaf size is 16.0 and the maximum leaf size is 4096.0 (this means that there will always be at least 8 leafs because the size of the environment is double).
- Neighbours
- A leaf can have 6 neighbours (one for each face). If a face does not have a neighbour (it's on an environment border) then the coresponding field is -1. If a neighbour field value has its high bit set then the value (without the high bit) is the index of another octtree leaf (this is the case when when the neighbour leaf is equal to or larger than the leaf). If the high bit is not set then the value is an index into a quadtree node array (the QTNA field of AKOT) (this is the case when there is more than one leaf neighbour for a face).
- Example
- The above leaf does not intersect any quads, has its maximum corner at (-2048.0, -2048.0, -2048.0), a size of 2048.0, no neighbours for all negative faces (its right in the negative corner of the environment) and positive faces have leafs as neighbours (no quadtree nodes here).
Main Page >> Oni Binary Data >> File Types >> OTLF File