PhysicsDirectSpaceState3D.intersect_shape is limited to 2048 results

kubecz3k commented 11 months ago

Godot version

4.2 beta, dce1aab174369e9124507f4614fc007301df52e7

System information

Godot v4.2.beta (dce1aab17) - Ubuntu 22.04.1 LTS 22.04 - X11 - Vulkan (Forward+) - dedicated AMD RADV NAVY_FLOUNDER () - AMD Ryzen 9 3900X 12-Core Processor (24 Threads)

Issue description

It's impossible to perform a physic engine query that would return more then 2048 results, max_results argument is simply ignored.

Things that were tested:

Also tested with custom shape (it's what we actually want to use in production)
Jolt physic engine works well in such case

Steps to reproduce

Create new scene

In ready add let's say 10 000 areas using PhysicsServer3D together with sphere shapes

const SCALE = 0.1
func _ready() -> void:
space_id = PhysicsServer3D.space_create()
for idx_x in range(1000):
    for idx_y in range(1000):
        var area_id: RID = PhysicsServer3D.area_create()
        var position: Vector3 = Vector3(idx_x, idx_y, 0)
        var transform: Transform3D = Transform3D(Basis(), Vector3(idx_x*SCALE, idx_y*SCALE, 0))
        var shape_id: RID = PhysicsServer3D.sphere_shape_create()
        PhysicsServer3D.shape_set_data(shape_id, 0.5 * SCALE)
        PhysicsServer3D.area_set_space(area_id, space_id)
        PhysicsServer3D.area_add_shape(area_id, shape_id)
        PhysicsServer3D.area_set_transform(area_id, transform)
        PhysicsServer3D.area_set_collision_layer(area_id, 1)
        PhysicsServer3D.area_set_collision_mask(area_id, 0)

In _physics_process perform a PhysicsServer3D query using PhysicsShapeQueryParameters3D

func _physics_process(delta: float) -> void:
var physics_direct_state: PhysicsDirectSpaceState3D = PhysicsServer3D.space_get_direct_state(space_id)
var box_shape_query: PhysicsShapeQueryParameters3D = PhysicsShapeQueryParameters3D.new()
var box_shape: BoxShape3D = BoxShape3D.new()
box_shape_query.collide_with_areas = true
box_shape_query.collide_with_bodies = false
box_shape_query.collision_mask = 1
box_shape.size = Vector3(1000,1000,100)
box_shape_query.shape = box_shape
var result = physics_direct_state.intersect_shape(box_shape_query, 100000)
print("results nmb: ", result.size())

Notice the nmb of results in a query is 2048 while it should be 100000

Minimal reproduction project

PhysicQueryResultsCountIssue.zip

AThousandShips commented 11 months ago

This is in fact a hard coded limit, should be documented at minimum

kubecz3k commented 11 months ago

I expected it's hard-coded, I think it should be a setting in ProjectSettings

godotengine / godot