UnityEditor.HandleUtility.InitHandleMaterials C# (CSharp) Method

        private static void InitHandleMaterials()
        {
            if (s_HandleWireMaterial == null)
            {
                s_HandleWireMaterial = (Material) EditorGUIUtility.LoadRequired("SceneView/HandleLines.mat");
                s_HandleWireMaterial2D = (Material) EditorGUIUtility.LoadRequired("SceneView/2DHandleLines.mat");
                s_HandleWireTextureIndex = ShaderUtil.GetTextureBindingIndex(s_HandleWireMaterial.shader, Shader.PropertyToID("_MainTex"));
                s_HandleWireTextureIndex2D = ShaderUtil.GetTextureBindingIndex(s_HandleWireMaterial2D.shader, Shader.PropertyToID("_MainTex"));
                s_HandleDottedWireMaterial = (Material) EditorGUIUtility.LoadRequired("SceneView/HandleDottedLines.mat");
                s_HandleDottedWireMaterial2D = (Material) EditorGUIUtility.LoadRequired("SceneView/2DHandleDottedLines.mat");
                s_HandleDottedWireTextureIndex = ShaderUtil.GetTextureBindingIndex(s_HandleDottedWireMaterial.shader, Shader.PropertyToID("_MainTex"));
                s_HandleDottedWireTextureIndex2D = ShaderUtil.GetTextureBindingIndex(s_HandleDottedWireMaterial2D.shader, Shader.PropertyToID("_MainTex"));
            }
        }