Creating 3D mesh file from mediapipe facial landmarks

[Sawaiz8]

Is there a way to convert landmarks into meshes? I extracted facial landmarks from mediapipe facial landmarker it gave me 3 dimensional facial landmarks i.e it has x, y, z coordinates of each landmark. I want to use them to create a 3D mesh but I am having trouble converting them into a mesh.
This is my code:

x_coords, y_coords, z_coords = get_marks(detection_result)

Create a NumPy array of vertices
vertices = np.column_stack((x_coords, y_coords, z_coords))
Create a mesh object
mesh = o3d.geometry.TriangleMesh()

Set the vertices of the mesh
mesh.vertices = o3d.utility.Vector3dVector(vertices)

Compute the Delaunay triangulation to create faces
mesh.compute_triangle_normals()
mesh.compute_vertex_normals()

output_path = "output_mesh.obj"

Save the mesh as an OBJ file
o3d.io.write_triangle_mesh(output_path, mesh)

When I load the file in blender, it does have any mesh.
Is there a good way to accomplish this?

[stormboy]

You need to define the triangles as references to the vertices.

Perhaps the easiest way to do this is to create a point cloud first, and then create a mesh using TriangleMesh.create_from_point_cloud_alpha_shape or one of the other functions to create a mesh from a point cloud?

See surface reconstruction in the docs.

Besides that, with prior knowledge of the landmarks and their neighbours, you may construct the triangles yourself to populate the mesh with.