How can I display AABBs/Bounding Boxes for debugging purposes

Question

How can I see the created AABBs while running the game? I need to be able to see them inorder to debug them.

Comments

Could you elaborate on what are your AABBs? AFAIK there's no built-in AABB nodes. If they are colliders, you can show them under Debug/Visible Collision Shapes.
Edit: ah, you speak about bounding boxes in title. So do you mean VisualInstance's get_aabb? I'm not sure if there's a way to show bounding boxes automatically, but suppose you can write a script for that.

Answer 1

I found this add-on by Zylann that easily allows me to do this.
https://github.com/Zylann/godot_debug_draw

Answer 2

Here's what I came up with assuming you mean VisualInstance's aabbs. Set target to parent of nodes which you want to show aabbs of.

class_name DrawAabbs
extends ImmediateGeometry

export(NodePath) var target
# How far recursive search goes. -1 = everything
export(int, -1, 10) var subchildren_levels = -1

var rand = RandomNumberGenerator.new()

func _ready() -> void:
    if target is NodePath:
        target = get_node(target)
    var mat = SpatialMaterial.new()
    mat.vertex_color_use_as_albedo = true 
    set_material_override(mat)


func _process(_delta):
    clear()
    # Give random colors, but similiar each frame by initializing with same seed
    rand.seed = get_instance_id()
    draw_aabbs(target, subchildren_levels)


func draw_aabbs(node : Node, recursive := -1):
    # Draw aabb if there is one
    if node.has_method("get_transformed_aabb") and node != self:
        var aabb = node.get_transformed_aabb()
        var c = Color(rand.randi())
        c.a = 1
        draw_aabb(aabb, c)
    # Then draw aabbs of children
    if recursive != 0:
        for child in node.get_children():
            draw_aabbs(child, recursive - 1)


func draw_aabb(aabb:AABB, color:Color) -> void:
    begin(Mesh.PRIMITIVE_LINES)
    set_color(color)
    set_normal(Vector3(1, 0, 0))

    # Bottom
    add_vertex(to_local(aabb.position))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 0, 0)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 0, 0)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 0, 1)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 0, 1)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 0, 1)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 0, 1)))
    add_vertex(to_local(aabb.position))

    # Top
    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 1, 0)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 1, 0)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 1, 0)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 1, 1)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 1, 1)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 1, 1)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 1, 1)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 1, 0)))

    # Sides
    add_vertex(to_local(aabb.position))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 1, 0)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 0, 0)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 1, 0)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 0, 1)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(0, 1, 1)))

    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 0, 1)))
    add_vertex(to_local(aabb.position + aabb.size * Vector3(1, 1, 1)))
    end()

Comments

Thank you for the detailed answer. I found an add-on that easily allows me to draw debug boxes.

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That's cool. Well, at least I got some experience in 3D, as I haven't tried it earlier :)

Answer 3

In the IDE, select Debug/Visible Collision Shapes.

Comments

That option does not display bounding boxes.