- Qt 6.7
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- Qt Quick 3D - Principled Material Example
- Qt Quick 3D | Commercial or GPLv3

# Qt Quick 3D - Principled Material Example

     // Copyright (C) 2023 The Qt Company Ltd.
     // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

     import QtQuick
     import QtQuick.Controls
     import QtQuick.Layouts
     import QtQuick3D

     // qmllint disable missing-property
     // Disabling missing-property because the targetMaterial property
     // will either be a PrincipaledMaterial or SpecularGlossyMaterial
     // but the shared properties are not part of the common base class
     ScrollView {
         id: rootView
         required property Material targetMaterial
         ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
         width: availableWidth

         ColumnLayout {
             width: rootView.availableWidth

             MarkdownLabel {
                 text: `# Clearcoat
     Clearcoat when enabled gives the appearance of another protective layer on top
     of the existing material. A real life analog would be a clear lacquer.

     ## Clearcoat Amount
     To enable the clearcoat layer, the value of Clearcoat amount must be change to
     something greater than 0.0. There is a cost for adding a clearcoat layer
     (basically doing all specular lighting for a second time) so is disabled by
     default.
     `
             }

             RowLayout {
                 Label {
                     text: "Clearcoat Amount (" + rootView.targetMaterial.clearcoatAmount.toFixed(2) + ")"
                     Layout.fillWidth: true
                 }
                 Slider {
                     from: 0
                     to: 1
                     value: rootView.targetMaterial.clearcoatAmount
                     onValueChanged: rootView.targetMaterial.clearcoatAmount = value
                 }
             }

             MarkdownLabel {
                 text: `### Clearcoat Map
     The Clearcoat Map is a single channel texture in which when multiplied against
     the Clearcoat Amount property determines what the clearcoat amount is for the
     material.`
             }
             ComboBox {
                 id: clearcoatChannelComboBox
                 textRole: "text"
                 valueRole: "value"
                 implicitContentWidthPolicy: ComboBox.WidestText
                 onActivated: rootView.targetMaterial.clearcoatChannel = currentValue
                 Component.onCompleted: currentIndex = indexOfValue(rootView.targetMaterial.clearcoatChannel)
                 model: [
                     { value: PrincipledMaterial.R, text: "Red Channel"},
                     { value: PrincipledMaterial.G, text: "Green Channel"},
                     { value: PrincipledMaterial.B, text: "Blue Channel"},
                     { value: PrincipledMaterial.A, text: "Alpha Channel"}
                 ]
             }

             TextureSourceControl {
                 defaultTexture: "maps/noise.png"
                 defaultClearColor: "black"
                 onTargetTextureChanged: {
                     rootView.targetMaterial.clearcoatMap = targetTexture
                 }
             }

             MarkdownLabel {
                 text: `## Clearcoat Roughness
     Just like the base material layer, the Clearcoat layer also has has a roughness
     property. The Clearcoat Roughness property will make the specular reflection of
     the clearcoat layer more diffuse.`
             }

             RowLayout {
                 Label {
                     text: "Clearcoat Roughness (" + rootView.targetMaterial.clearcoatRoughnessAmount.toFixed(2) + ")"
                     Layout.fillWidth: true
                 }
                 Slider {
                     from: 0
                     to: 1
                     value: rootView.targetMaterial.clearcoatRoughnessAmount
                     onValueChanged: rootView.targetMaterial.clearcoatRoughnessAmount = value
                 }
             }

             MarkdownLabel {
                 text: `### Clearcoat Roughness Map
     The Clearcoat Roughness Map is a single channel texture in which when multiplied
     against the Clearcoat Roughness Amount property determines the roughness of the clearcoat
     layer for the material.`
             }

             ComboBox {
                 id: clearcoatRoughnessChannelComboBox
                 textRole: "text"
                 valueRole: "value"
                 implicitContentWidthPolicy: ComboBox.WidestText
                 onActivated: rootView.targetMaterial.clearcoatRoughnessChannel = currentValue
                 Component.onCompleted: currentIndex = indexOfValue(rootView.targetMaterial.clearcoatRoughnessChannel)
                 model: [
                     { value: PrincipledMaterial.R, text: "Red Channel"},
                     { value: PrincipledMaterial.G, text: "Green Channel"},
                     { value: PrincipledMaterial.B, text: "Blue Channel"},
                     { value: PrincipledMaterial.A, text: "Alpha Channel"}
                 ]
             }

             TextureSourceControl {
                 defaultTexture: "maps/noise.png"
                 defaultClearColor: "black"
                 onTargetTextureChanged: {
                     rootView.targetMaterial.clearcoatRoughnessMap = targetTexture
                 }
             }

             MarkdownLabel {
                 text: `## Clearcoat Normal Map
     Finally, the clearcoat layer also supports applying a normal map to further
     define the surface details. This normal map works the same way as the Normal
     Map property of PrincipledMaterial, just only applies to the clearcoat layer.
     It is possible that the material would have two normal maps applied in this
     case.
     `
             }

             TextureSourceControl {
                 defaultTexture: "maps/metallic/normal.jpg"
                 defaultClearColor: Qt.rgba(0.5, 0.5, 1.0, 1.0)
                 stampMode: true
                 stampSource: "maps/normal_stamp.png"
                 onTargetTextureChanged: {
                     rootView.targetMaterial.clearcoatNormalMap = targetTexture
                 }
             }
         }
     }
     // qmllint enable missing-property