waited far too long for an initial commit but here we are

Scripts/DebugMesh.gd

@@ -0,0 +1,42 @@
+@tool
+extends MeshInstance3D
+class_name DebugMesh
+
+
+func _ready():
+	var mat = StandardMaterial3D.new()
+	mesh = ImmediateMesh.new()
+	mat.no_depth_test = true
+	mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+	mat.vertex_color_use_as_albedo = true
+	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	set_material_override(mat)
+
+
+func clear():
+	mesh.clear_surfaces()
+
+
+func draw_line(begin_pos: Vector3, end_pos: Vector3, color: Color = Color.RED) -> void:
+	mesh.surface_begin(Mesh.PRIMITIVE_LINES)
+	mesh.surface_set_color(color)
+	mesh.surface_add_vertex(begin_pos)
+	mesh.surface_add_vertex(end_pos)
+	mesh.surface_end()
+
+
+func draw_sphere(center: Vector3, radius: float = 1.0, color: Color = Color.RED) -> void:
+	var step: int = 30
+	var sppi: float = 2 * PI / step
+	var axes = [
+		[Vector3.UP, Vector3.RIGHT],
+		[Vector3.RIGHT, Vector3.FORWARD],
+		[Vector3.FORWARD, Vector3.UP]
+	]
+	for axis in axes:
+		mesh.surface_begin(Mesh.PRIMITIVE_LINE_STRIP)
+		mesh.surface_set_color(color)
+		for i in range(step + 1):
+			mesh.surface_add_vertex(center + (axis[0] * radius)
+				.rotated(axis[1], sppi * (i % step)))
+		mesh.surface_end()