It works, thank you very much :) Two more questions: 1) If I want to make color1 fully transparent, I guess using the color alpha channel wont work, so maybe I have to make a custom shader to discard color1 pixels? Or do you have any other sugestions ? 2) Is there a equivalent to OpenGL glLineWidth(...) to make the lines thicker ? And something like glGetFloatv(GL_LINE_WIDTH, ...); ? Best regardsJoão
Em sexta-feira, 28 de maio de 2021 19:59:19 GMT+1, Laszlo Agocs <laszlo.ag...@qt.io> escreveu: #yiv1622565661 P {margin-top:0;margin-bottom:0;}Hi, The custom geometry lacks UV coordinates in your example application, and so it samples with texture coordinates (0, 0) for any fragment, hence getting a line with color0 instead of the expected color0-color1-color0-... Add two floats per vertex and register an attribute for TexCoord0: m_vertexData.resize(m_count * 5 * sizeof(float)); ... *p++ = 0.0f; // U *p++ = 0.0f; // V ... *p++ = 1.0f; // U *p++ = 0.0f; // V ... setStride(5 * sizeof(float)); addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0, Attribute::F32Type); addAttribute(QQuick3DGeometry::Attribute::TexCoord0Semantic, 3 * sizeof(float), Attribute::F32Type); Best regards,Laszlo From: Interest <interest-boun...@qt-project.org> on behalf of joao morgado via Interest <interest@qt-project.org> Sent: Friday, May 28, 2021 6:07 PM To: interest@qt-project.org <interest@qt-project.org> Subject: [Interest] Drawing a dashed line with Qt Quick 3D 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 | | | | Bitbucket | | | Here is the small qt quick 3d example that is failling: LineDashed.zip | | | | LineDashed.zip | | | 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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