Water.extm: Difference between revisions
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|2 | |2 | ||
|Unsigned Short | |Unsigned Short | ||
|<code>xAxisFlowRate 128= no flow | |<code>xAxisFlowRate</code> 128 = no flow | ||
|- | |- | ||
|0x04 | |0x04 | ||
|2 | |2 | ||
|Unsigned Short | |Unsigned Short | ||
|<code>zAxisFlowRate 128= no flow | |<code>zAxisFlowRate</code> 128 = no flow | ||
|- | |- | ||
| | |0x06 | ||
|1 | |1 | ||
|Unsigned Byte | |Unsigned Byte | ||
|<code>materialIndex + 3</code>. This may act as a checksum? | |<code>materialIndex + 3</code>. This may act as a checksum? | ||
|- | |- | ||
| | |0x07 | ||
|1 | |1 | ||
|Unsigned Byte | |Unsigned Byte | ||
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|} | |} | ||
<code>height</code> and <code> | <code>height</code> and <code>flowRate</code> are stored as unsigned shorts, but seem to map to float values. These can be calculated by dividing by the max size of an unsigned short: | ||
<syntaxhighlight lang="c" line="line"> | <syntaxhighlight lang="c" line="line"> |
Latest revision as of 16:37, 26 August 2024
water.extm
files describe the water heightmap and the texture of the main field and add-on content field.
water.extm File Specification
water.extm File Layout
Each file contains a 64×64 grid. For each vertex there is 8 bytes of data that describe the height of the mesh, the material type and flow speed.
Water Map Data
Each entry in the water data table is 8 bytes long.
Offset (h) | Size | Data Type | Description |
---|---|---|---|
0x00 | 2 | Unsigned Short | height (Vertex y component)
|
0x02 | 2 | Unsigned Short | xAxisFlowRate 128 = no flow
|
0x04 | 2 | Unsigned Short | zAxisFlowRate 128 = no flow
|
0x06 | 1 | Unsigned Byte | materialIndex + 3 . This may act as a checksum?
|
0x07 | 1 | Unsigned Byte | materialIndex
|
height
and flowRate
are stored as unsigned shorts, but seem to map to float values. These can be calculated by dividing by the max size of an unsigned short:
32767 / 0xffff = 0.5
height
is further multiplied by another constant to get the final height (the constant is unknown at this time, but is close to 0x300 / 0xffff
).
x
and z
[1] can be calculated, while iterating through the data table:
for (int index = 0; index < 64 * 64; index++) {
uint x = index % 64;
uint z = index / 64;
}
Flow Rates are calculated as (flowRate * 2) - 1
and ranges from -1
to 1
. On the x-axis this changes flow direction from East (-1
) to West (+1
) and on the z-axis from North (-1
) to South (+1
).
Material Index
This data is stored in Terrain.Tex1.bfres.
id | file | name | attribute | attribute_sub | flag | Google Translated |
---|---|---|---|---|---|---|
0 | Water | 水 | Water | Water | 0 | Water |
1 | HotWater | 熱湯 | Water | Water_Hot | 0 | Hot water |
2 | Poison | 毒水 | Water | Water_Poison | 0 | Poison water |
3 | Lava | 溶岩 | Lava | Lava | 0 | Lava |
4 | IceWater | 冷たい水 | Water | Water_Ice | 0 | Cold water |
5 | Mud | 泥沼 | Bog | Bog | 0 | Bog |
6 | Clear01 | 透明水01 | Water | Water | 0 | Clear water 01 |
7 | Sea | 海 | Water | Water | 0 | Ocean |
- ↑
z
is expected to be an integer quotient. Thefloor
function can be used if integer division is not supported.