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I have a system that auto-detects how many nodes with the same starting name are, and its adding the collision polygons in a navpolyinstance. While iterating i get this error

Unable to iterate on object of type Object

My script

for i in range(clicks):
    var col_polygon = get_node("object" + str(clicks)).get_node("CollisionPolygon2D")
    var new_poly = PoolVector2Array();
    for vector in col_polygon:
        new_poly.append(vector + get_node("object" + str(clicks)).get_position())

The clicks variable adds 1 to itself when a button is pressed.
The object node is an instanced scene which contains a collisionpolygon2d

in Engine by (400 points)

1 Answer

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Best answer

You can't iterate a CollisionPolygon2D, which is what the col_polygon variable is equal to after the get_node().

I think you want the object's polygon, which would be:

var col_polygon = get_node("object" + str(clicks)).get_node("CollisionPolygon2D").polygon

The polygon property returns a PoolVector2Array which you can iterate.

See CollisionPolygon2D for details.

by (20,677 points)
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Oh yes, thats right... thank you... also, do you know what means "convex partition failed". I get this message sometimes in the output and the navigation messes up
After searching through Godot's code, i found this

TriangulatorPartition tpart;
if (tpart.ConvexPartition_HM(&in_poly, &out_poly) == 0) { //failed!
    print_line("convex partition failed!");

I have no idea about what this could mean...

and BTW, in Godot 3 its get_node("CollisionPolygon2D").get_polygon() instead of just polygon

In 2.1, you would use get_polygon(). 3.0 uses member variables. See http://docs.godotengine.org/en/latest/classes/class_collisionpolygon2d.html#member-variables

"convex partition failed" means the engine is having trouble partitioning your polygon. It could mean one of the vertices is badly placed.

Huh, weird... i use 3.0 stable, when i do get_polygon() it works, when i do polygon it crashes

Do you get an error when it crashes? Those should be equivalent.

Oh, no something else has caused the game to crash... my bad

And i really don't know why i get the "convex partition failed" message. All vertices are in the right place, im sure about that (i use pixel snap). It messes up the navigation and i dont know why! The first collision the player touches works normal, but then i get this message and it basically deletes other collision polygons...
Thats what the console says:

ERROR: SelfList::List::~List: Condition ' first != 0 ' is true.
At: c:\projects\godot-builds\godot\core\self
convex partition failed!

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