Structure d'un fichier milkshape 3d (ms3d)

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Je poste cette explication que j'ai fait il y a peu de temps, je suis désolé elle est en anglais et j'ai pas eu le temps de la traduire .....

J'ai mis ce code sous vb car je donne les differents type en vb a la fin du tuto.

Source / Exemple :


First, I'm going to describe variables which will be used along explanation, then I will explain how the file is structured.

Bytes / Visual basic / C ++ 
1 byte / Byte / Byte 
2 bytes / Integer / Word 
4 bytes / Long / DWord 
4 bytes floating / Single Float 
8 bytes floating / Double Double 
Multiple text size / String / Char 

A vector is in fact a compound of three compononents : x = 4 bytes floating, y = 4 bytes floating and z = 4 bytes floating.

MilkShape 3d File structure :

Now, I shall say you how a ms3d is writen, or how you can read it. 

The firts bytes in a ms3d file describes the header

10 bytes are reserved for identification, the value is = MS3D000000 
in vb it's Dim Id as String * 10 and in c++ char Id[10]

2 bytes are used for the file's version, here the value is = 8

Then you can get the vertices :

2 bytes are reserved for an uknown use (in the most case the value is 0)
First 2 bytes decribe the vertices' numbers
Then, for each vertices :
a flag As Byte
x As Single
y As Single
z As Single
Bone As Byte
reference As Byte

After vertices you can retrieve the triangles :

Firsts 2 bytes are use for the number of vertices
Then, for each vertices :
flag As Integer
IndiceVertex0 As Integer
IndiceVertex1 As Integer
IndiceVertex2 As Integer 
a little sophisticated, you can put in order the next bytes in a table :

NormalVertex_0_X   NormalVertex_0_Y    NormalVertex_0_Z 
NormalVertex_1_X   NormalVertex_1_Y    NormalVertex_1_Z 
NormalVertex_2_X   NormalVertex_2_Y    NormalVertex_2_Z 

In fact it's 3 vectors for the normal of the triangle, with Single property
tu1 As Single
tu2 As Single
tv1 As Single
tv2 As Single
SmoothingGroup As Byte
IndexGroup As Byte

You have got the triangles, now groups :

Like other parts, the number of groups is reffered on 2 bytes
Then for each vertex :
Flag As Integer
Name as string (32 bytes max)
NumberTriangles As Integer
TrianglesIndices as Integer, it's also a large table he have the dimension of NumberTriangles - 1
MaterialIndex as byte, if is equal to -1 then no material

Now material "chunk" :

Number of Material As Integer
Only if the number is > 1 then for each vertices :
Name As String (32 bytes max)
AmbientX As Single
AmbientY As Single
AmbientZ As Single
DiffusX As Single
DiffusY As Single
DiffusZ As Single 
SpeculaireX As Single
SpeculaireY As Single
SpeculaireZ As Single 
EmetteurX As Single
EmetteurY As Single
EmetteurZ As Single 
Glow As Single
Transparency As Single
Mode As String
Texture As String (128 bytes max)
MapAlpha As String (128 bytes max)

You have got the material, you have few information about animation :

Frame per Seconde As Single
Current Time for the animation (the frame selected ??) As Single
Frame's Number As Long     '<-- Before i have make a mistake (Integer)

You ARE almost finished, remains the bones : 

Number of Bone in the scene As Integer
Flag As Byte
Name As String (32 byte max)
Parent's Name As String (32 byte max)
RotationX As Single
RotationY As Single
RotationZ As Single
PositionX As Single
PositionY As Single
PositionZ As Single
Number of key frame for rotation As Integer
Number of key frame for translation As Integer
KeyFrame for rotation :
  Time as Single
  RotationX as Single
  RotationY as Single
  RotationZ as Single
KeyFrame for transformation :
 Time as Single
 PositionX as Single
 PositionY as Single
 PositionZ as Single

A last accuracy, for all flags, in fact it's an information about selected or hidden.
I hope you have succeeded in your project and that my english is not too bad or weird ... 

Here you can find the variable of my explanation: Voiçi donc les différentes variables correspondant à mon explication : Public Type ms3D_header ID As String * 10 version As Integer End Type Public Type ms3D_vertex drapeau As Byte X As Single '<--- Ou Coordonée as D3DVECTOR Y As Single Z As Single Bone As Byte reference As Byte End Type Public Type ms3d_Triangle drapeau As Integer IndiceVertex(2) As Integer NormalVertex(2, 2) As Single Tu(2) As Single Tv(2) As Single GroupeLissage As Byte IndexGroup As Byte End Type Public Type ms3d_edge IndiceEdge(1) As Integer End Type Public Type ms3d_group Flag As Byte 'Selectionné/caché Select/Hide name As String * 32 nbTriangle As Integer triangleIndices() As Integer materialIndex As Byte '-1 pas de materiel -1 = No material End Type Public Type ms3d_material Nom As String * 32 Ambient(3) As Single Diffus(3) As Single Speculaire(3) As Single Emetteur(3) As Single Brillant As Single Transparence As Single Mode As String Texture As String * 128 MapAlpha As String * 128 End Type Public Type ms3d_framecle_rot Durée As Single Rotation As D3DVECTOR End Type Public Type ms3d_framecle_trans Durée As Single Rotation As D3DVECTOR End Type Public Type ms3d_Struct Flag As Byte ' Sélectionné ou non Nom As String * 32 NomParrent As String * 32 RotationX As Single RotationY As Single RotationZ As Single PositionX As Single PositionY As Single PositionZ As Single NbrFrameCléRotation As Integer NbrFrameCléTranslation As Integer FrameCleRotation() As ms3d_framecle_rot FrameCleTranslation() As ms3d_framecle_trans End Type Public Entete As ms3D_header Public Vertices() As ms3D_vertex Public Triangles() As ms3d_Triangle Public Edge() As ms3d_edge Public Group() As ms3d_group Public Materiaux() As ms3d_material Public Structure() As ms3d_Struct Public NbrVertices As Integer Public NbrTriangles As Integer Public NbrGroup As Integer Public NbrMateriaux As Integer Public NbrStructure As Integer Public FPS As Single Public TempsCourrant As Single Public NbrFrame As Long '<--- Before i have make a mistake (Integer)

Conclusion :


Je sais pas si il y a de bug dans mes explications, si vous en voyez faite moi le savoir.
J'ai couvert l'ensemble du fichier il me semble.

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OneHacker
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J'ai mis 8/10 ! Car c'est du travail !
ciberrique
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lundi 25 août 2003
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Merci, la note m'importe peu, je veux juste partagé des connaissances ... Comme j'ai peu le faire avec les 2 beta viewer 3ds et ms3d. Ou encore la dixaine de tuto sur dx.
Merci encore.
shadowmoy
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petite corrections :

Private Type ms3d_material
Nom As String '* 32
Ambient As ARGBcolor '(3) As Single
Diffus As ARGBcolor '(3) As Single
Speculaire As ARGBcolor '(3) As Single
Emetteur As ARGBcolor '(3) As Single
Brillant As Single
Transparence As Single
mode As Byte 'not used
Texture As String '* 128
MapAlpha As String '* 128
End Type

Private Type ms3d_keyframe_rot_t
time As Single ' time in seconds
Rotation(2) As Single ' x, y, z angles
End Type


Private Type ms3d_keyframe_pos_t
time As Single ' time in seconds
position(2) As Single ' x, y, z local position
End Type

Private Type ms3d_Struct
flag As Byte ' Sélectionné ou non
Nom As String * 32
NomParent As String * 32

Rotation As D3DVECTOR
' RotationX As Single
' RotationY As Single
' RotationZ As Single

Translation As D3DVECTOR
' TranslationX As Single
' TranslationY As Single
' TranslationZ As Single

NbrFrameCléRotation As Integer 'nombres de rotations
NbrFrameCléTranslation As Integer 'nombre de translation

keyFramesRot() As ms3d_keyframe_rot_t 'tablo de rotations
keyFramesTrans() As ms3d_keyframe_pos_t 'tablo de translations

End Type


et d'autres encore ....

je mettrais le lecteur individuel de ms3d des que j'aurai fini la partie rendue des animations par bones (squelette)
ciberrique
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Merci pour les corrections sa ne peut faire qu'evoluer les sources ... J'ai hate de voir le lecteur individuel, car je ne connais pas les animations sous dx, donc j'en apprendrais d'avantage ...
shadowmoy
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pour les anim des fichiers ms3d fo gerer les bones et la je capte pas encore trop le fonctionnement
Commenter la réponse de ticomic

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