View Analysis_view distance and direction to a particular building facade

chris · March 29, 2022, 1:56am

This is a good question but it’s probably going to need an extra calculation. Essentially, you’ll have to first figure out the number of _view_points that are within a given distance of a particular grid point. Once you have that, it’s pretty easy. You’ll just have to edit this line of code inside the component:

github.com

ladybug-tools/ladybug-grasshopper/blob/master/ladybug_grasshopper/src/LB Visibility Percent.py#L147

    
      
          int_mtx = objectify_output('Visibility Intersection Matrix', int_matrix)
          vec_count = len(_view_points)
          if pt_weights_:  # weight intersections by the input point weights
              tot_wght = sum(pt_weights_) / vec_count
              adj_weights = [wght / tot_wght for wght in pt_weights_]
              results = []
              for int_vals in int_matrix:
                  w_res = [ival * wght for ival, wght in zip(int_vals, adj_weights)]
                  results.append(sum(w_res) * 100 / vec_count)
          else:  # no need to wieght results
              results = [sum(int_list) * 100 / vec_count for int_list in int_matrix]
          
          
# create the mesh and legend outputs
          graphic = GraphicContainer(results, study_mesh.min, study_mesh.max, legend_par_)
          graphic.legend_parameters.title = '%'
          if legend_par_ is None or legend_par_.are_colors_default:
              graphic.legend_parameters.colors = Colorset.view_study()
          title = text_objects(
              'Visibility Percent', graphic.lower_title_location,
              graphic.legend_parameters.text_height * 1.5,
              graphic.legend_parameters.font)

Essentially, you’ll want to divide by the number of points within the distance rather than the vec_count (aka. the total number of points). You’ll also probably need something to catch the case that no points are within the max_dist_ since you’ll otherwise get a ZeroDivisionError.

If enough people here find this useful, maybe we can add something for this natively in the official component.