@TIG said in Making a selection in a ruby script and applying command:

selected_base_face= sel.grep(Sketchup::Face)[0]

Awesome, the base face works great when a face with edges is selected!

@TIG ```
Sorry, this should read better.
Will the base face method work if there is no face, just lines that could be a face?
<# Get the active model and selection
mod = Sketchup.active_model
sel = mod.selection

<# Define z and perpendicular measurements
z_measurement = 2 * perpendicular_measurement
perpendicular_measurement = 3.0

<# Get selected edges
selected_edges = sel.grep(Sketchup::Edge)

<# Exit if there are no selected edges
if selected_edges.empty?
UI.messagebox('Please select an edge to draw the triangle connected to.')
return
end

<# Select the first selected edge
selected_edge = selected_edges.first

<# Get the start and end vertices of the selected edge
start_point = selected_edge.start.position
end_point = selected_edge.end.position

<# Calculate the midpoint of the selected edge
midpoint = Geom::Point3d.linear_combination(0.5, start_point, 0.5, end_point)

<# Calculate the direction vector perpendicular to the edge
direction_vector = end_point - start_point
perpendicular_vector = Geom::Vector3d.new(-direction_vector.y, direction_vector.x, 0).normalize
perpendicular_vector.length = perpendicular_measurement

<# Calculate the third vertex of the triangle
third_vertex = midpoint.offset(perpendicular_vector)

<# Create a point at the desired height above the midpoint
point_above_midpoint = midpoint.offset([0, 0, z_measurement])

<# Define the vertices of the triangle
triangle_vertices = [midpoint, point_above_midpoint, third_vertex]

<# Create the triangle face
triangle_face = mod.entities.add_face(triangle_vertices)

<# Create an edge between midpoint and third_vertex
midpoint_third_vertex_edge = mod.entities.add_line(midpoint, third_vertex)

<# Get the active model and selection
mod = Sketchup.active_model
sel = mod.selection

<# Get the selected edge
selected_edge = sel.grep(Sketchup::Edge).first

<# Exit if no edge is selected
unless selected_edge
UI.messagebox('Please select an edge to determine its Z height.')
return
end

<# Get the Z coordinate of the selected edge
selected_edge_start_z = selected_edge.start.position.z
selected_edge_end_z = selected_edge.end.position.z

<# Define a tolerance for comparing Z coordinates
tolerance = 1e-6

<# Select all edges with starting and ending Z coordinates matching the selected edge
mod.entities.each do |entity|
if entity.is_a?(Sketchup::Edge)
edge = entity
next if edge == selected_edge

# Get the starting and ending Z coordinates of the edge
edge_start_z = edge.start.position.z
edge_end_z = edge.end.position.z

# Check if starting and ending Z coordinates match the selected edge
if (selected_edge_start_z - edge_start_z).abs < tolerance &&
   (selected_edge_end_z - edge_end_z).abs < tolerance
  sel.add(edge)
end

end

<# Remove the edge between midpoint and third_vertex to the selection
sel.remove(midpoint_third_vertex_edge)

<# Convert the selection to an array of edges
connected_edges_array = selected_edges.to_a

<# Perform follow me operation on triangle face using selected edges as path
triangle_face.followme(connected_edges_array)
end

If I add those last two lines I mentioned for followme, I get this:

@TIG
Here is all the code that works and results in a closed loop of the edges I want. Not sure how to get the results to make a followme. I am testing this on a simple rectangle to start.

Get the active model and selection

mod = Sketchup.active_model
sel = mod.selection

Define z and perpendicular measurements

z_measurement = 2 * perpendicular_measurement
perpendicular_measurement = 3.0

Get selected edges

selected_edges = sel.grep(Sketchup::Edge)

Exit if there are no selected edges

if selected_edges.empty?
UI.messagebox('Please select an edge to draw the triangle connected to.')
return
end

Select the first selected edge

selected_edge = selected_edges.first

Get the start and end vertices of the selected edge

start_point = selected_edge.start.position
end_point = selected_edge.end.position

Calculate the midpoint of the selected edge

midpoint = Geom::Point3d.linear_combination(0.5, start_point, 0.5, end_point)

Calculate the direction vector perpendicular to the edge

direction_vector = end_point - start_point
perpendicular_vector = Geom::Vector3d.new(-direction_vector.y, direction_vector.x, 0).normalize
perpendicular_vector.length = perpendicular_measurement

Calculate the third vertex of the triangle

third_vertex = midpoint.offset(perpendicular_vector)

Create a point at the desired height above the midpoint

point_above_midpoint = midpoint.offset([0, 0, z_measurement])

Define the vertices of the triangle

triangle_vertices = [midpoint, point_above_midpoint, third_vertex]

Create the triangle face

triangle_face = mod.entities.add_face(triangle_vertices)

Create an edge between midpoint and third_vertex

midpoint_third_vertex_edge = mod.entities.add_line(midpoint, third_vertex)

Get the active model and selection

mod = Sketchup.active_model
sel = mod.selection

Get the selected edge

selected_edge = sel.grep(Sketchup::Edge).first

Exit if no edge is selected

unless selected_edge
UI.messagebox('Please select an edge to determine its Z height.')
return
end

Get the Z coordinate of the selected edge

selected_edge_start_z = selected_edge.start.position.z
selected_edge_end_z = selected_edge.end.position.z

Define a tolerance for comparing Z coordinates

tolerance = 1e-6

Select all edges with starting and ending Z coordinates matching the selected edge

mod.entities.each do |entity|
if entity.is_a?(Sketchup::Edge)
edge = entity
next if edge == selected_edge

# Get the starting and ending Z coordinates of the edge
edge_start_z = edge.start.position.z
edge_end_z = edge.end.position.z

# Check if starting and ending Z coordinates match the selected edge
if (selected_edge_start_z - edge_start_z).abs < tolerance &&
   (selected_edge_end_z - edge_end_z).abs < tolerance
  sel.add(edge)
end

end

Remove the edge between midpoint and third_vertex to the selection

sel.remove(midpoint_third_vertex_edge)
end

Hi,
I'm new to making ruby scripts and am attempting to automate a sequence of actions I use constantly. The basic idea is, I select an edge and my script will draw a triangle of my specified size and select all the edges that are connected to my initial selection and perform a followme on the triangle. Everything works up until the followme. My triangle is created and my selection set is accurate. If I stop the script there, I can manually click Followme and it works on the path. But I can't seem to get the script to recognize those additional selected lines. It will only do a followme on the very first line I picked before running the script. It doesn't collect the new edges.
I used this language to attempt the followme:

Convert the selection to an array of edges

connected_edges_array = selected_edges.to_a

Perform follow me on triangle face using selected edges as path

triangle_face.followme(connected_edges_array)

What am I missing?