Godot 4 Simple Material-Based Footsteps

This Godot project contains the class MaterialBody, a helper class that bakes a special StaticBody for detecting a specific material on surfaces.

Usage

Attach the script material_body.gd to any Node3D you want to have a detectable surface e.g. level node/scene.

Detecting

You can use any physics nodes for detecting collision objects, whether Area3D, RayCast3D, or ShapeCast3D with the collision_mask bit corresponding to the constant variable MATBODY_PHYSICS_LAYER value in matbody.gd. The metadata mb_mat inside detected CollisionShape3D will tell the material.

In this project, I used Layer 2 (1 << 1)

Ray casting example

func _physics_process(delta : float) -> void :
	# Get collided object
	var body : CollisionObject3D = raycast3d.get_collider()
	# Get the shape index
	var shapeidx : int = raycast3d.get_collider_shape()
	# Get CollisionShape3D object
	var shape : CollisionShape3D = body.shape_owner_get_owner(shapeidx)
	# Check if the CollisionShape3D node has information from MaterialBody
	if shape.has_meta('mb_mat') :
		# Detected a material
		var mat : Material = shape.get_meta('mb_mat')
		# ...do something...

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