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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ // Test for QTBUG-145056: Writing to NORMAL via TANGENT/BINORMAL in a CustomMaterial
++ // MAIN() must take effect when DebugSettings.Normals is active. The regression
++ // (introduced by the DefaultMaterial shader-generator cleanup) caused qt_customMain()
++ // to be skipped entirely in debug passes so the debug visualization always showed
++ // unperturbed vertex normals regardless of what MAIN() wrote to NORMAL.
++
++ import QtQuick
++ import QtQuick3D
++
++ Rectangle {
++ width: 400
++ height: 400
++ color: "black"
++
++ View3D {
++ anchors.fill: parent
++ renderMode: View3D.Offscreen
++
++ environment: SceneEnvironment {
++ backgroundMode: SceneEnvironment.Color
++ clearColor: "black"
++ debugSettings: DebugSettings {
++ materialOverride: DebugSettings.Normals
++ }
++ }
++
++ DirectionalLight {
++ brightness: 1.5
++ eulerRotation.x: -40
++ eulerRotation.y: 45
++ }
++
++ camera: PerspectiveCamera {
++ z: 350
++ }
++
++ // Left sphere: CustomMaterial with TBN-space normal map applied in MAIN().
++ // In debug Normals mode the output must show the perturbed normals, not
++ // the smooth vertex normals — confirming MAIN() was actually called.
++ Model {
++ source: "#Sphere"
++ position: Qt.vector3d(-100, 0, 0)
++ materials: CustomMaterial {
++ property TextureInput normalMap: TextureInput {
++ enabled: true
++ texture: Texture {
++ source: "../shared/maps/RibsNormal.png"
++ }
++ }
++ fragmentShader: "custommaterial_debug_normals.frag"
++ }
++ }
++
++ // Right sphere: same CustomMaterial but normalMap texture disabled —
++ // the NORMAL stays unperturbed, producing a smooth normal-sphere gradient.
++ Model {
++ source: "#Sphere"
++ position: Qt.vector3d(100, 0, 0)
++ materials: CustomMaterial {
++ property TextureInput normalMap: TextureInput {
++ enabled: false
++ texture: Texture {
++ source: "../shared/maps/RibsNormal.png"
++ }
++ }
++ fragmentShader: "custommaterial_debug_normals.frag"
++ }
++ }
++ }
++ }