RaycastModifierEditor.cs

using UnityEditor;

namespace Pathfinding {
    [CustomEditor(typeof(RaycastModifier))]
    [CanEditMultipleObjects]
    public class RaycastModifierEditor : Editor {
        SerializedProperty iterations, useRaycasting, thickRaycast, thickRaycastRadius, use2DPhysics, raycastOffset, useGraphRaycasting, subdivideEveryIter, mask;

        void OnEnable () {
            iterations = serializedObject.FindProperty("iterations");
            useRaycasting = serializedObject.FindProperty("useRaycasting");
            thickRaycast = serializedObject.FindProperty("thickRaycast");
            thickRaycastRadius = serializedObject.FindProperty("thickRaycastRadius");
            use2DPhysics = serializedObject.FindProperty("use2DPhysics");
            raycastOffset = serializedObject.FindProperty("raycastOffset");
            useGraphRaycasting = serializedObject.FindProperty("useGraphRaycasting");
            subdivideEveryIter = serializedObject.FindProperty("subdivideEveryIter");
            mask = serializedObject.FindProperty("mask");
        }

        public override void OnInspectorGUI () {
            serializedObject.Update();

            EditorGUI.indentLevel = 0;

            EditorGUILayout.PropertyField(iterations);
            if (iterations.intValue < 0 && !iterations.hasMultipleDifferentValues) iterations.intValue = 0;

            EditorGUILayout.PropertyField(useRaycasting);

            if (useRaycasting.boolValue) {
                EditorGUI.indentLevel++;

                EditorGUILayout.PropertyField(use2DPhysics);
                EditorGUILayout.PropertyField(thickRaycast);

                if (thickRaycast.boolValue) {
                    EditorGUI.indentLevel++;
                    EditorGUILayout.PropertyField(thickRaycastRadius);
                    if (thickRaycastRadius.floatValue < 0 && !thickRaycastRadius.hasMultipleDifferentValues) thickRaycastRadius.floatValue = 0;
                    EditorGUI.indentLevel--;
                }

                EditorGUILayout.PropertyField(raycastOffset);
                EditorGUILayout.PropertyField(mask, new UnityEngine.GUIContent("Layer Mask", mask.tooltip));
                EditorGUI.indentLevel--;
            }

            EditorGUILayout.PropertyField(useGraphRaycasting);
            EditorGUILayout.PropertyField(subdivideEveryIter, new UnityEngine.GUIContent("Subdivide Every Iteration", subdivideEveryIter.tooltip));

            serializedObject.ApplyModifiedProperties();
        }
    }
}