[Interest] Drawing a dashed line with Qt Quick 3D

[joao morgado]

I'm trying to make a dashed line in quick3d. I made the line with QQuick3DGeometry, and exposed it to qml, all good.Then I tried to apply a  custom texture with QQuick3DTextureData, using a texture made with 2 colors with size of 2x1 pixels, but I only get to see the first color. 
I sucessfully did in the past a dashed line example with raw OpenGL see here: Bitbucket


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Bitbucket


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Here is the small qt quick 3d example that is failling:
LineDashed.zip


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LineDashed.zip


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Any help is welcome.
The relevant code is:
// main.qmlView3D {        id: view3D        visible: true        anchors.fill: parent     ......         importScene: sceneRoot
        Node {            id: sceneRoot
 ......             // solid line, all good            Line {                p0: Qt.vector3d(-55, 55, 0)                p1: Qt.vector3d(55, -55, 0)                baseColor: "red"                //visible: false            }
            // dashed line, error: only the first color is show            Line_dashed {                p0: Qt.vector3d(-80, -40, 0)                p1: Qt.vector3d(80, 80, 0)                color1: "orange"                color2: "yellow"                //visible: false            }
        }//Node: sceneRoot
    }//View3D}

// Line_dashed.qml
import QtQuick 2.12import QtQuick3D 1.15import Entity_Line 1.0import LineTexture 1.0
Node {
    property alias p0: line.p0    property alias p1: line.p1    property alias color1: lineTex.color1    property alias color2: lineTex.color2
    Model {         geometry: EntityLine {             id: line             p0: Qt.vector3d(-55, -55, 50)             p1: Qt.vector3d(55, 55, 50)         }
         materials: DefaultMaterial {             id: material             lighting:  DefaultMaterial.NoLighting             diffuseMap: Texture {                 textureData: LineTexture {                     id: lineTex                     //color1: "blue"                     //color2: "white"                 }                 magFilter: Texture.Nearest                 minFilter: Texture.Nearest                 mappingMode: Texture.UV                 scaleU: 2                 scaleV: 1             }         }
         pickable: true         property bool isPicked: false     }}

// custom texture
void LineTexture::generateTextureData(){   m_textureData.resize(2 * 4 * sizeof (float)); //QByteArray    float *p = reinterpret_cast<float *>(m_textureData.data());         *p++ = m_color1.redF();    *p++ = m_color1.greenF();    *p++ = m_color1.blueF();    *p++ = m_color1.alphaF();
    *p++ = m_color2.redF();    *p++ = m_color2.greenF();    *p++ = m_color2.blueF();    *p++ = m_color2.alphaF();
    setTextureData(m_textureData);    setSize(QSize(2,1));    //setFormat(QQuick3DTextureData::Format::RGBA8);    setFormat(QQuick3DTextureData::Format::RGBA32F);    setHasTransparency(true);}

CheersJoão



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