Normally I use the add_face method to create a face and looking at the documentation I should be able to use the same method where I have a number of points along with a couple arcs that will define the geometry of the face. The funny thing is I have never run into this before, I’ve only had to deal with polygon faces (only straight segments) or circles.
Does anyone have an example of creating a face with the add_face method that involves straight segments (ie. points) and arc(s)?
In order to include an arc into the add_face() signature you need to convert the arc into it’s constituent point array. Here is code that creates an arc, a point, then calls add_face() with the point appended to the arc point array.
leftCurve=theGroup.entities.add_arc([-50-,50,0],Geom::Vector3d.new(1,0,0),Geom::Vector3d.new(0,0,1),50,0.degrees,90.degrees,8) pt2=0,0,0 theGroup.entities.add_face(leftCurve.collect{|e|e.vertices}.flatten.uniq<<pt2)
I am more inclined to use #find_faces…
so adding to the API #add_arc example
centerpoint = Geom::Point3d.new
# Create a circle perpendicular to the normal or Z axis
vector = Geom::Vector3d.new 0,0,1
vector2 = Geom::Vector3d.new 1,0,0
vector3 = vector.normalize!
model = Sketchup.active_model
entities = model.active_entities
edges = entities.add_arc centerpoint, vector2, vector3, 10, 15.degrees, 135.degrees
arccurve = edges.first.curve
###
# add an edge to close the arc.
closer = entities.add_line(arccurve.first_edge.start, arccurve.last_edge.end)
# let the edge find it's own face.
closer.find_faces
john
Thank-you for both or your examples I learn something new every day when it comes to the Sketchup API.
One potential subtle difference between the two approaches: in @john_drivenupthewall 's technique, #find_faces will find all faces bordered by the closer line, not just the one bounded by the new geometry you just created. I’m not sure whether #add_face in @JimG’s method will also find adjacent faces or only the one you added (not where I can check right now). But in either case, you might consider enclosing the geometry in a group if you don’t want to affect anything else.
find_faces draws every possible face that ca be drawn, similar to what SketchUp does when you draw edges through the UI. When creating a drawing tool that draws edges this is useful to match the native behavior but when making a plugin that draws more high level stuff you typically want to specify yourself exactly what faces to draw.
I’d typically use add_face with the series of edges or the points as arguments.
add_face also accepts edges. You can create edges up front and then create the face.
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