Add production bathymetric sonar slice

game/domain/sonar/sonar_contact.gd

@@ -0,0 +1,39 @@
+class_name SonarContact
+extends RefCounted
+
+const SonarMaterial = preload("res://game/domain/sonar/sonar_material.gd")
+
+var contact_id: StringName
+var material: SonarMaterial.Value
+var center_m: Vector3
+var bounds: AABB
+var maximum_intensity: float
+var sample_count: int
+
+
+func _init(
+	p_contact_id: StringName,
+	p_material: SonarMaterial.Value,
+	p_center_m: Vector3,
+	p_bounds: AABB,
+	p_maximum_intensity: float,
+	p_sample_count: int
+) -> void:
+	contact_id = p_contact_id
+	material = p_material
+	center_m = p_center_m
+	bounds = p_bounds
+	maximum_intensity = p_maximum_intensity
+	sample_count = p_sample_count
+
+
+func validation_error() -> String:
+	if contact_id.is_empty():
+		return "sonar contact id is empty"
+	if material == SonarMaterial.Value.UNKNOWN or not SonarMaterial.is_valid(material):
+		return "sonar contact material is invalid"
+	if sample_count <= 0:
+		return "sonar contact sample count must be positive"
+	if not is_finite(maximum_intensity) or maximum_intensity < 0.0 or maximum_intensity > 1.0:
+		return "sonar contact intensity must be between 0 and 1"
+	return ""