How can I get rid of zig zag artifact on sphere surface in vispy?

Question

everyone

I'm working on the 3D visualization of planets in the solar system. As I am going to apply texture, I have manually computed the texture coordinates(texcoords) and I get the zig-zag artefact as appears in the image.

I believe that my computation might have something wrong. I have attached the texcoords computation below

# Compute Texture Coordinates  
def get_texcoords(vertices):
    texcoords = []
    for v in vertices:
        #thresholding
        for i in range(3):
            if np.abs(v[i]) > 1e-6:
                v[i] = v[i]
            elif np.abs(v[i]) < 1e-6:
                v[i] = 0.0

        # Compute position in uv-space
        radius = np.sqrt(v[0]**2 + v[1]**2 + v[2]**2)
        
        latitude = np.arcsin(v[2]/radius)
        longitude = np.arctan2(v[1],v[0])
            
        # Convert to texture coordinates
        u = round(0.5 + longitude/(2*np.pi),5)
        v = round(0.5 + latitude/np.pi,5)

        texcoords.append([u,v])
            
    return np.array(texcoords)

Is there any way to get those artefacts away, or does it have a smarter way to obtain texture coordinate in vispy.

Thank you for your help and suggestion.