msh_ply: Is it possible to define color per vertex ?

[HuguesDelorme]

Hello, So far I have used msh_ply to write a PLY file containing XYZ vertices and faces. I would like to support color per vertex, is this possible ? The PLY header would be:

ply
format binary_little_endian 1.0
element vertex 6612
property float x
property float y
property float z
property uchar red
property uchar green
property uchar blue
element face 6392
property list uchar int vertex_indices
end_header
...

How would you define the corresponding "vertex" descriptor ?

Thanks for your help!

[mhalber]

Oh my, I have completely missed this! It's a year late, but if someone else has similar issue - msh_ply can support arbitrary descriptors like so:

  msh_ply_t *pf = msh_ply_open( filename, "wb" );
  int32_t error = MSH_PLY_FILE_OPEN_ERR;
  if( pf )
  {
    error = MSH_PLY_NO_ERR;
    const char* vertex_attributes[] = { "x", "y", "z",
                                        "nx", "ny", "nz",
                                        "red", "green", "blue" };
    const char* face_attributes[] = { "vertex_indices" };

    msh_ply_desc_t positions_desc = { (char*)"vertex", &vertex_attributes[0], 3, MSH_PLY_FLOAT, MSH_PLY_INVALID, 
                                      &vertex_positions, NULL, &vertex_count, 0 };
    msh_ply_desc_t normals_desc   = { (char*)"vertex", &vertex_attributes[3], 3, MSH_PLY_FLOAT, MSH_PLY_INVALID,
                                      &vertex_normals, NULL, &vertex_count, 0 };
    msh_ply_desc_t colors_desc    = { (char*)"vertex", &vertex_attributes[6], 3, MSH_PLY_UINT8, MSH_PLY_INVALID, 
                                      &vertex_colors, NULL, &vertex_count, 0 };
    msh_ply_desc_t face_desc      = { (char*)"face",   &face_attributes[0],    1, MSH_PLY_INT32, MSH_PLY_UINT8,   
                                      &faces_ind, NULL, &face_count, 3 };

    msh_ply_add_descriptor( pf, &positions_desc );
    msh_ply_add_descriptor( pf, &normals_desc );
    msh_ply_add_descriptor( pf, &colors_desc );

    error = msh_ply_write(pf);
    if ( error) printf("%s\n", msh_ply_error_msg( error ) );
  }

  msh_ply_close(pf);