WOW M2 文件格式学习

Header

The header has mostly the layout of number-offset pairs, containing the number of a particular record in the file, and the offset. These appear at fixed places in the header. Record sizes are not specified in the file.

The unknown blocks have (mostly arbitrary) alphabetic names until we figure out what they are.

Offset

Type

Description

0x000

char[4]

"MD20"

0x004

uint8[4]

Version (always 00 01 00 00)

0x008

uint32

model name length

0x00C

uint32

model name offset

0x010

uint32

Model type? always 0, 1 or 3 (mostly 0)

0x014

uint32

nGlobalSequences - number of global sequences 全局的时间序列，各个动画的duration

0x018

uint32

ofsGlobalSequences - offset to global sequences

0x01C

uint32

nAnimations - number of animation sequences

0x020

uint32

ofsAnimations - offset to animation sequences

0x024

uint32

nC

0x028

uint32

ofsC

0x02C

uint32

nD - always 201 or 203 depending on WoW client version

0x030

uint32

ofsD

0x034

uint32

nBones - number of bones

0x038

uint32

ofsBones - offset to bones

0x03C

uint32

nF - bone lookup table

0x040

uint32

ofsF

0x044

uint32

nVertices - number of vertices

0x048

uint32

ofsVertices - offset to vertices

0x04C

uint32

nViews - number of views (LOD versions?) 4 for every model

0x050

uint32

ofsViews - offset to views

0x054

uint32

nColors - number of color definitions   Material的Emissive, Specular Color动画

0x058

uint32

ofsColors - offset to color definitions  

0x05C

uint32

nTextures - number of textures  全局纹理

0x060

uint32

ofsTextures - offset to texture definitions

0x064

uint32

nTransparency - number of transparency definitions  感觉这里是模型的透明度动画?

0x068

uint32

ofsTransparency - offset to transparency definitions

0x06C

uint32

nI - always 0

0x070

uint32

ofsI

0x074

uint32

nTexAnims - number of texture animations

0x078

uint32

ofsTexAnims - offset to texture animations

0x07C

uint32

nK

0x080

uint32

ofsK

0x084

uint32

nRenderFlags - number of blending mode definitions 与场景的混合方式，共有6种。

0x088

uint32

ofsRenderFlags - offset to blending mode definitions

0x08C

uint32

nY - bone lookup table

0x090

uint32

ofsY

0x094

uint32

nTexLookup - number of texture lookup table entries  全局纹理数组的查询表

0x098

uint32

ofsTexLookup - offset to texture lookup table

0x09C

uint32

nTexUnits - texture unit definitions?  子材质Sub of Material，对应一次提交（一组渲染状态）

0x0A0

uint32

ofsTexUnits

0x0A4

uint32

nTransLookup - number of transparency lookup table entries   

0x0A8

uint32

ofsTransLookup - offset to transparency lookup table

0x0AC

uint32

nTexAnimLookup - number of texture animation lookup table entries  

0x0B0

uint32

ofsTexAnimLookup - offset to texture animation lookup table

0x0B4

14 * float

float values ... ? (in range -1000...1000, mostly in -20...30)

0x0EC

uint32

nBoundingTriangles   绑定Mesh的三角形索引，用来做较精确的碰撞检测。

0x0F0

uint32

ofsBoundingTriangles    

0x0F4

uint32

nBoundingVertices   绑定Mesh的顶点数据

0x0F8

uint32

ofsBoundingVertices

0x0FC

uint32

nBoundingNormals  绑定Mesh的法向量

0x100

uint32

ofsBoundingNormals

0x104

uint32

nO

0x108

uint32

ofsO

0x10C

uint32

nP

0x110

uint32

ofsP

0x114

uint32

nQ

0x118

uint32

ofsQ

0x11C

uint32

nLights - number of lights 光源

0x120

uint32

ofsLights - offset to lights

0x124

uint32

nCameras - number of cameras

0x128

uint32

ofsCameras - offset to cameras

0x12C

uint32

nCameraLookup

0x130

uint32

ofsCameraLookup

0x134

uint32

nRibbonEmitters - number of ribbon emitters

0x138

uint32

ofsRibbonEmitters - offset to ribbon emitters

0x13C

uint32

nParticleEmitters - number of particle emitters

0x140

uint32

ofsParticleEmitters - offset to particle emitters

 

Particle emitters

nparticleEmitters records of 0x1F8 bytes starting at ofsParticleEmitters, followed by data referenced in these records.

The records have the following structure:

Offset

Type

Description

0x000

int32

id (always -1?)

0x004

int32

flags 表示粒子行为和表现的标记位，如面向摄像机的方式、属性随机的方式（光晕、武器光等），我觉得这部分可以归纳为不同的发射器，如光晕效果可以用一个环形发射器实现。

0x008

float[3]

position

0x014

int16

Bone ID

0x016

int16

Texture ID

0x018

uint32

Number of ints referenced #1

0x01C

uint32

Offset to list of ints #1

0x020

uint32

Number of ints referenced #2

0x024

uint32

Offset to list of ints #2

0x028

int16

Blending mode 与场景混合方式

0x02A

int16

Emitter type 发射器类型

0x02C

int16

Particle type 面向摄像机方式

0x02E

int16

Texture tile rotation (-1,0,1)

0x030

int16

Rows on texture  ? 使用的纹理包含纹理动画时，一行包含的动画帧数目

0x032

int16

Columns on texture  ? 一列包含的动画帧数目

0x034

AnimationBlock (float) [10]

Parameters 10个属性的关键帧数据

0x14C

float[36]

unknown float values - more parameters?

0x14C

float

Midpoint in lifespan? (0 to 1)

0x150

uint32[3]

ARGB colors (start, mid, end) 颜色动画关键帧

0x15C

float[3]

Particle sizes (start, mid, end) 缩放关键帧

0x168

short[10]

Indices into the tiles on the texture?如果是索引，那为什么要记录这些数据？顺序播放不成吗，难道同一个纹理动画有多种播放策略？ 需要在WOW里面需求例子。

0x17C

float[3]

Unknown

0x188

float[3]

Something about particle scaling? Hm.

0x194

float

Slowdown

0x198

float

Particle rotation

0x19C

float[10]

Unknown (usually all 0)

0x1C4

float[6]

Unknown, usually (2.5, 0.7, 7, 0.9, 0, 0)

0x1DC

AnimationBlock (int)

unknown

About slowdown: for nonzero values, instead of travelling linearly the particles seem to slow down sooner. I can't work out the exact function but for a value of, say, 10, the particles pretty much stay in place. Not the same effect as gravity, though. Update: thanks to nsz for the formula. Speed is multiplied by exp( -slowdown * t )

About particle rotation: 0 for none, 1 to rotate the particle 360 degrees throughout its lifetime.

The ten animatable particle parameters are:

Number

Description

0

Emission speed 发射速度

1

Speed variation (range: 0 to 1) 速度变化

2

Spread? (range: 0 to pi) 相对发射器发射方向的扩散角度

3

 ? (range: 0 to 2*pi)

4

Gravity 重力

5

Lifespan 寿命

6

Emission rate 发射率

7

Emission area length 发射区域的长度

8

Emission area width发射区域的宽度

9

Gravity? (much stronger) 重力

Emitter types:

Value

Description

1

Plane (rectangle)

2

Sphere

3

(Spline? can't be bothered to find one)

Particle types:

Value

Description

0

"normal" particle

1

large quad from the particle's origin to its position (used in Moonwell water effects)

2

seems to be the same as 0 (found some in the Deeprun Tram blinky-lights-sign thing)

Flags:

Value

Description

0x1000

do not billboard (used for some water wake ripple effects)