How to check if a KinematicBody is on floor in C#?

JohnEK

As the title states, is there an equivalent to 'is_on_floor()' in C# for Kinematic bodies? I currently figured a workaround by tracing for colliding geometry below feet but that's a little expensive and quite unpredictable when the floor isn't flat.

MagicLord

Hi there,

You must enable countact reported and contact monitor on your kinematic or rigidbody object.

I use this GDscript code to detect a collision with other objects, try to convert it to C#

func _integrate_forces(state): 

	print(state.get_contact_count()); 
	
	if(state.get_contact_count()>0):
		
		print("BULLET collision ", state.get_contact_collider_object(0));
		
		for i in range(state.get_contact_count()):
			
			var cc = state.get_contact_collider_object(i);
			
			var nameObject = cc.get_name();							
		
			print(state.get_contact_collider_object(i));
			
			if(cc.get_script()!=null && nameObject.begins_with("enemy")):
				cc.getDamage(damage);
				
		destroy();

JohnEK

Thanks @MagicLord! Going to give it a shot asap.

JohnEK

Okay just took a look at the code. It looks great for tracking generic collisions but floor collision only is what I'm currently interested in. Unfortunately, unless the devs used a different name IsOnFloor() doesn't seem to exist in C#. I use the following method atm:

	RayCast FloorRay;
    public override void _Ready()
    {
    	FloorRay = (RayCast)GetNode("FloorRayCast");
    }
    
    bool IsOnFloor()
    {
    	// Make sure floor raytracing is enabled.
    	return FloorRay.IsEnabled () && FloorRay.IsColliding ();
    }

It can get buggy on certain floors though no matter how well the raycast node is set and I 'd really love a more secure solution.

EDIT: Actually, seems like most KinematicBody member functions are missing in C#.

MagicLord

@JohnEK said: Okay just took a look at the code. It looks great for tracking generic collisions but floor collision only is what I'm currently interested in. Unfortunately, unless the devs used a different name IsOnFloor() doesn't seem to exist in C#. I use the following method atm:
	RayCast FloorRay;
    public override void _Ready()
    {
    	FloorRay = (RayCast)GetNode("FloorRayCast");
    }
    
    bool IsOnFloor()
    {
    	// Make sure floor raytracing is enabled.
    	return FloorRay.IsEnabled () && FloorRay.IsColliding ();
    }
It can get buggy on certain floors though no matter how well the raycast node is set and I 'd really love a more secure solution.

Your object will register all collisions happening, in the code i posted i just go through all collisions and check the objects colliding names. You can do the same and check if one of the objects colliding has a name "floor". There also is collision flags and masks, you can setup up to only register collisions with some objects collision flag and mask.

What is the purpose of your object ? it is the player ?

Some games uses multiple raycast per direction to detect if the object can move, this is another way but it's more expensive.

JohnEK

Yes, the object is the player indeed. Although your method translates to C# perfectly I 'd like to avoid naming things or setting flags manually. At this point, I wonder if I should consider switching to GDScript :neutral:

JohnEK

Okay, somehow by switching to Monodevelop 'IsOnFloor()' gets compiled perfectly! Probably some syntax mistake I failed to notice earlier (?) or I don't know. Well, it works now so I guess that's fine! In any case, thanks for all the help!