GMesh data structure UML.txt

GMesh (inspired by Blender BMesh and UnityBMesh)

https://wiki.blender.org/wiki/Source/Modeling/BMesh/Design


Thought: each struct with class wrapper?

class Vertex
{
    struct VertexData
    {
        int index;
        float3 pos;
        int edgeIndex; // an index to the referenced struct for native enumeration
    }
    
    GMesh mesh; // backref?
    VertexData vertexData; // the data struct
    Edge edge; // a class reference
}


Uses PlantUML (Rider plugin) to render UML graph:

@startuml
class GMesh
{
    List: verts, edges, loops, faces;
    Add/RemoveVertex()
    Add/RemoveEdge()
    Add/RemoveFace()
    FindEdge(v1, v2)
}
struct Vertex
{
    int index
    float3 pos, normal
    Edge e (index of e?)
}
struct Edge
{
    int index
    Vertex v0, v1
    Edge prev0, prev1
    Edge next0, next1
    Loop l (index of l?)
}
struct Loop
{
    (int index)
    Vertex firstEdgeVertex
    float2 uv0, uv1
    Edge e
    Face f
    Loop radialPrev, radialNext  //around edge
    Loop prev, next //around face
}
struct Face
{
    int index
    Loop startLoop
    int vertexCount //eq: loop, edge
    float3 faceNormal
    int materialIndex
}

Vertex }-- Edge
Edge }--{ Edge
Edge *--* Loop
Loop }--{ Loop
Loop }--{ Loop
Loop x--> Vertex
Loop *--* Face
@enduml

GMesh --> Vertex
GMesh --> Edge
GMesh --> Loop
GMesh --> Face