Convex Cell: VBW::index_t or ushort

[PlathC]

I'm building Voronoi cell geometry from the triangulation through the ConvexCell class as follows:

for(GEO::index_t nn = 0; nn < cell.nb_v(); nn++) {
    if(cell.vertex_triangle(nn) == VBW::END_OF_LIST)
        continue;

    if(cell.v_global_index(nn) == VBW::global_index_t(-1))
        continue;

    VBW::index_t start = cell.vertex_triangle(nn);
    VBW::index_t t = start;
    do {
        if(t != GEO::index_t(-1)) {
            // Here: t must be converted to VBW::ushort
            const GEO::vec3 vertex = cell.triangle_point(t);
            
            // Actual computation on cell vertex
        }

        // Continue traversal
        VBW::index_t lv = cell.triangle_find_vertex(t, nn);
        t = cell.triangle_adjacent(t, (lv + 1) % 3);
    } while(t != start);
}

In this example, the user must perform a cast from VBW::index_t to VBW::ushort even if it seems that the API actually only needs a VBW::ushort from function declaration:

• index_t vertex_triangle(index_t v) const -> Returns a VBW::index_t by performing a cast from a VBW::ushort.
• vec3 triangle_point(ushort t) const -> Asks for a VBW::ushort which is converted to VBW::index_t in its call of compute_triangle_point