How do you represent a object like mesh with data class in taichi?

[artmortal93]

For signed distance function of 3D object, It could represent the object like this:
@ti.dataclass
class Sphere:
center: vec3
radius: float

@ti.dataclass
class Triangle:
p1: vec3
p2: vec3
p3:vec3

Or more generally

@ti.dataclass
class SDFObject:
floatField1:float
...
floatFieldN:float
vec3Field1:vec3
...
vec3FieldN:vec3
GeoType:int # 1 for sphere 2 for triangle and so on

But how do you represent a triangle mesh object? I want to do somethng like this:

@ti.dataclass:
class Mesh:
face: ti.Matrix(n,3) #dynamic size,but can be determined on runtime
normal:ti.Matrix() #same size as face
n:int #number of triangles
Meshfield = Mesh.field(shape=(10,)) #represent all the mesh in the scene

Or do I need to construct the cloud into something like this, this solution make the AABB box searching difficult?
AllFaces = ti.root.dynamic(ti.i, N, chunk_size=32) #represent all the faces of all mesh,precaculate the total faces number in the scene?
face = ti.Vector.field(n=3, dtype=float, shape=(3,))
AllFaces.place(face)