Aswering my question about lineWith, there's a lineWith property in
DefaultMaterial, but that may not always work according the docs "none of the
following can be expected to support wide lines: Direct3D, Metal, OpenGL with
core profile contexts." It worked or me in linux, but failed on mac, and
windows.
So I did a workaround by creating a line with 4 points with a TriangleStrip
primitive, now it works for all the plataforms. It's solved !!!
CheersJoão
Em sexta-feira, 28 de maio de 2021 21:28:33 GMT+1, joao morgado via Interest
<interest@qt-project.org> escreveu:
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:
#yiv4610245498 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
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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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