Re: [Interest] Drawing a dashed line with Qt Quick 3D
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
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
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 on behalf of joao morgado via
Interest
Sent: Friday, May 28, 2021 6:07 PM
To: 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(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
Re: [Interest] Drawing a dashed line with Qt Quick 3D
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
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 on behalf of joao morgado via
Interest
Sent: Friday, May 28, 2021 6:07 PM
To: 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(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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Interest@qt-project.org
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Re: [Interest] Drawing a dashed line with Qt Quick 3D
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 on behalf of joao morgado via
Interest
Sent: Friday, May 28, 2021 6:07 PM
To: 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<https://bitbucket.org/joaodeusmorgado/opengltutorials/src/master/T07.1_TextureLines/mygl.cpp>
<https://bitbucket.org/joaodeusmorgado/opengltutorials/src/master/T07.1_TextureLines/mygl.cpp>
Bitbucket
Here is the small qt quick 3d example that is failling:
LineDashed.zip<https://drive.google.com/file/d/1ND5xsCLCdM2zK35Yt8PbOaC3ycTleKwc/view?usp=sharing>
<https://drive.google.com/file/d/1ND5xsCLCdM2zK35Yt8PbOaC3ycTleKwc/view?usp=sharing>
[https://s.yimg.com/lb/brands/80x80_google.png]
LineDashed.zip
Any help is welcome.
The relevant code is:
// main.qml
View3D {
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 2.12
import QtQuick3D 1.15
import Entity_Line 1.0
import 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(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);
}
Cheers
João
___
Interest mailing list
Interest@qt-project.org
https://lists.qt-project.org/listinfo/interest
[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(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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