Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

ambient : C3D_Material
bottom : Tex3DS_SubTexture
c : C3D_FVec
diffuse : C3D_Material
emission : C3D_Material
height : Tex3DS_SubTexture
i : C3D_FVec
j : C3D_FVec
k : C3D_FVec
left : Tex3DS_SubTexture
m : C3D_Mtx
r : C3D_FVec, C3D_Mtx
right : Tex3DS_SubTexture
specular0 : C3D_Material
specular1 : C3D_Material
top : Tex3DS_SubTexture
w : C3D_FVec
width : Tex3DS_SubTexture
x : C3D_FVec
y : C3D_FVec
z : C3D_FVec