package protobj;

// 4D Vertex
message Vertex {
    optional float x = 1 [default=0];
    optional float y = 2 [default=0];
    optional float z = 3 [default=0];
    optional float w = 4 [default=1];
}

// RGB color (each color in [0,255])
message Color {
    optional uint32 r = 1 [default=255];
    optional uint32 g = 2 [default=255];
    optional uint32 b = 3 [default=255];
}

// Texture coordinate 
message UV {
    optional float u = 1 [default=0];
    optional float v = 2 [default=0];
    optional float w = 3 [default=1];
}

// Polygonal face
message Face {
    optional uint32 poly_type = 1    [default=3];        //polygonal type = number of sides
    repeated uint32 vert_index = 2   [packed=true];      //vertex array index
    repeated uint32 uv_index = 3     [packed=true];      //uv array index
    repeated uint32 norm_index = 4   [packed=true];      //normal array index
    repeated uint32 order = 5        [packed=true];      //Original order (to preserve original array order)  
}

// Mesh data
message Mesh {
    optional string name = 1;
    optional string comments = 2;

    // Core
    repeated Vertex vertices = 3;   //Vertex array, Should *never* be empty
    repeated Face faces = 4;        //Face array, can be empty
    repeated Vertex normals = 5;    //Normal array, can be empty
    repeated Color colors = 6;      //Color array, can be empty
    repeated UV uvs = 7;            //UV array, can be empty

    // Extension support
    extensions 2000 to max;
}