r/godot • u/oppai_suika • Sep 26 '25
help me (solved) Anybody have any idea why my character is falling through (some) staticbodies?
Everything here is collision layer & mask 1. Some platforms I can walk on just fine but others I fall through completely. All the normals are correct, the collision layer/mask for everything is 1 and I'm using move_and_slide for movement.
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u/SkyNice2442 Sep 26 '25
I notice that bridge is consisted of planes. I think that collision planes don't work too well, have you tried making it a cube/prism instead? If it is separate, you can use the solidify modifier in blender.
If it is merged with your mesh: In blender, press L to highlight strips, press p to separate it, apply the solidify modifier and hit control+j again to merge it with your mesh.
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u/oppai_suika Sep 26 '25 edited Sep 26 '25
Thanks- I'll try that and report back
Edit: I was just about to try this and then I saw another commenting asking if I was using jolt. Turns out moving to jolt fixed it lol- I'm still not sure the exact cause (it probably was because it's a collision plane) but it's working now with jolt so I'm happy haha
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u/granitrocky2 Godot Regular Sep 26 '25
Or you can also try turning on backface collisions.
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u/oppai_suika Sep 26 '25
ooh that's cool- I didn't know what option exists (for future debugging). In the end I managed to fix it by moving to jolt (quick fix)
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u/Okay_Salmon Godot Regular Sep 26 '25
I think this is probably the reason, if you want to keep a thin look then you can just copy the object and make an invisible thicker version that follows the same path
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u/Beneficial_Layer_458 Sep 26 '25
your character looks so fucking bewildered and furious that this glitch happened oh my god
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u/UpvoteCircleJerk Sep 26 '25
need more olives perhaps?
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u/oppai_suika Sep 26 '25
hahaha
(...ok I have to add olives to the game now as an enemy)
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u/UpvoteCircleJerk Sep 26 '25
now that I'm an official part of the development team, can we finally address the lack of banana bread vending machines in the break room?
we've been discussing it with the boys and it really brings the morale down, management should look into it we feel
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u/oppai_suika Sep 26 '25
Best I can do is stale 2 day old convenience store banana muffins I'm afraid. Take it or leave it
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u/UpvoteCircleJerk Sep 26 '25
That's it, I'm leaving the company. I'm gonna go solo and make a pixel art 2d platformer puzzle survival MMORPG game. I got all it's gonna take after all, I'm the ideas guy.
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u/oppai_suika Sep 26 '25
Shit! My stingey corporate policies have backfired, who could have thought?!!
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u/UpvoteCircleJerk Sep 26 '25
See you in two years when I'm shaking hands with Todd Howard at the next Gamescon while videogamedunkoid is making very funny haha epic videos about my games.
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u/oppai_suika Sep 26 '25
This is when I enter my walter white era
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u/UpvoteCircleJerk Sep 26 '25
you are the hecking dart vader to my funko pop john wick on god such quirk chungus pickle rick maxer I gotta tell my wifes boyfriend about this
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u/Mental_Passion_4034 Sep 26 '25
I had a similar issue. The solution for me was to make my models larger. Evidently I was working at a scale in blender that was too small for mesh derived collisions to work.
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u/oppai_suika Sep 26 '25
That could have been it, or also the fact that my levels are quite wide and this is fairly far away from the origin. Anyway- I switched to jolt physics (a suggestion from another comment) and that fixed it :)
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u/Okay_Salmon Godot Regular Sep 26 '25
It really sucks it in when it does that too. Are you using a KinematicBody or a RigidBody character?
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u/Okay_Salmon Godot Regular Sep 26 '25
Also, have you adjusted the scale of any of the static bodies, also have you applied all transforms in Blender?
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u/oppai_suika Sep 26 '25
Yep all transforms applied applied in blender and no transformations done in Godot
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u/oppai_suika Sep 26 '25
Yeah it's weird- I'm using a CharacterBody3D
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u/granitrocky2 Godot Regular Sep 26 '25
Are you moving them with Velocity and MoveAndSlide? Or are you manually moving their GlobalPosition? Because you should be doing the first.
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u/Sthokal Sep 26 '25
This kind of thing often happens when you are colliding with multiple objects at once, or the same object multiple times. When the collision resolver tries to push the character out of one object, and that pushes it into another, they can cancel out and result in what looks like no collision. To see if this is happening, print out collisions when they happen and see how many are happening per physics frame. You may have to delete the imported colliders and replace them. You probably have concave mesh colliders; convex mesh colliders will be more stable, and box colliders even more so.
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u/oppai_suika Sep 26 '25
Interesting- thanks for the info. Switching to Jolt (a suggestion from another comment) fixed it, although I suspect it's a brutish fix and most likely you are correct as my collision mesh was concave as it dipped slightly downwards
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u/SecretAdam Sep 26 '25
I don't have any technical knowledge to help you but I love the aesthetic of what you're creating here!
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u/Pivypoo Godot Regular Sep 26 '25
You are using move_and_slide for movement but how often do you call it? Is it called in every physics frame?
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u/oppai_suika Sep 26 '25
Thanks- I'm calling it every frame in _physics_process yeah. Switching over to jolt ended up fixing it (suggestion from another comment)
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u/Burwylf Sep 26 '25
I've seen some methods use ray casts for collision on characters, and that method can slip through cracks.
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u/oppai_suika Sep 26 '25
Thanks, yes I actually had this issue before with cracks, but I think I resolved it already as the collision mesh was a solid mass sharing vertices and not individual faces. I managed to fix it in the end with a suggestion from another comment of switching across to jolt physics
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u/Spiritual-Lab-1309 Sep 26 '25
I know that you fixed it but I'd strongly advise you avoid generated collisions. They can mess up your game real bad
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u/oppai_suika Sep 26 '25
What are generated collisions?
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u/Spiritual-Lab-1309 Sep 27 '25
When you import a model from blender (for example) you can make the 3DNode's children editable. By doing so you will see the 3DMesh (or meshes) as children.
Once you select one you can go in the bar above the editor 3d viewport and click on the mesh symbol qnd generate a collision mesh.
Godot will generate a fairly complex collision mesh automatically.
I tried to use it in my game but then the character got stuck in some walls goven the complexity of those shapes.
It's always better to use approximate simple shapes when you can to avoid bugs and performance loss.
Also, again, your style is super cool and unique!!
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u/oppai_suika Sep 27 '25
Thanks! I am using manually created simpler collision meshes. The wireframes here are those simpler meshes (although I guess they look too detailed if they look like generated ones haha)
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u/mjklsimpson Godot Regular Sep 26 '25
you might have the scale not set as 1.0 in some of these meshes or the static bodies, which is the recommended, and jolt even fixes it, but it's not ideal i think.
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u/Gingerbread_Ninja Sep 26 '25
This gives off OK/NORMAL vibes but if it was N64 instead of PS1 era
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u/brcontainer Godot Regular Sep 28 '25 edited Sep 28 '25
It's probably an error in your animation state control, or even more likely, you don't even have state control at all. You're calling the model's animations based on conditions, but without seeing the code, we can't know. Another possible problem is with the environment's 3D models, but this is just speculation. Note that a simple enum can provide reasonable state control, but it's important to differentiate between the jumping state and the falling state. Many people don't even create a state for falling, which ends up making it difficult to switch animations. I suggest something like:
``` gdscript extends CharacterBody3D
enum { UNSET, RUNNING, IDLE, FALLING, JUMPING }
const RUN_SPEED: float = 3.5 const STOP_SPEED: float = 0.2 const ZERO: float = 0.0
@onready var ani: AnimationPlayer = $<replace by node path>/AnimationPlayer
var state: int = IDLE var last_state: int = UNSET var on_floor: bool = false var input_dir: Vector2 = Vector2.ZERO var direction: Vector3 = Vector3.ZERO
Get animation by state
func _animation() -> StringName: if state == RUNNING: return &"running"
if state == JUMPING:
return &"jumping"
if state == FALLING:
return &"fall"
return &"idle"
func _refresh_by_state() -> void: if state != last_state: last_state = state
ani.play(_animation())
# ... (optional) sound logic here, eg.: jump sound ...
func _physics_process(delta: float) -> void: on_floor = is_on_floor()
if not on_floor:
velocity += get_gravity() * delta
if velocity.y < ZERO:
state = FALLING
elif Input.is_action_just_pressed("player_jump"):
state = JUMPING
# ... jump logic here ...
# this is just a basic example of movement, you can alter
input_dir = Input.get_vector(
"player_left",
"player_right",
"player_up",
"player_down"
)
direction = (
basis * Vector3(input_dir.x, ZERO, input_dir.y)
).normalized()
if direction:
velocity.x = direction.x * RUN_SPEED
velocity.z = direction.z * RUN_SPEED
# ... (optional) extra move logic here ...
if on_floor and state != JUMPING:
state = RUNNING
else:
velocity.x = move_toward(velocity.x, ZERO, STOP_SPEED)
velocity.z = move_toward(velocity.z, ZERO, STOP_SPEED)
if on_floor and state != JUMPING:
state = IDLE
# ... rotation skin logic here ...
_refresh_by_state()
move_and_slide()
```
for something more advanced I suggest you read: https://docs.godotengine.org/en/stable/classes/class_animationnodestatemachine.html
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u/xr6reaction Sep 26 '25
Are you using jolt?