c++ - Qt 6.2.0，Qt3D。COLLADA DAE 模型比 OBJ 更暗
问题描述
我很高兴在 Qt 6 中修复了加载 COLLADA DAE 文件的错误。但我有一个奇怪的问题：COLLADA DAE 模型比 OBJ 更暗。
我在 Blender 2.93 中创建了这个立方体：
使用 OBJ 可以正常工作：
但是当我导出到 DAE 时，我看到模型更暗：
这是我的 .pro 文件：
QT += 3dcore 3dlogic 3dextras 3dinput
这是 main.cpp 文件：
#ifdef _WIN32
#include <windows.h>
extern "C" __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
extern "C" __declspec(dllexport) DWORD AmdPowerXpressRequestHighPerformance = 0x00000001;
#endif
#include <QtCore/QDebug>
#include <QtGui/QGuiApplication>
#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DExtras/QCuboidMesh>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DExtras/QOrbitCameraController>
#include <Qt3DCore/QEntity>
#include <Qt3DCore/QTransform>
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QPointLight>
#include <Qt3DRender/QSceneLoader>
class Window : public Qt3DExtras::Qt3DWindow
{
public:
Window()
{
setTitle("COLLADA DAE 3D model");
resize(400, 400);
Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();
// Lighting
Qt3DCore::QEntity *lightEntity = new Qt3DCore::QEntity(rootEntity);
Qt3DRender::QPointLight *pointLight = new Qt3DRender::QPointLight(lightEntity);
Qt3DCore::QTransform *lightTransform = new Qt3DCore::QTransform(lightEntity);
lightTransform->setTranslation(QVector3D(20.f, 25.f, 30.f));
lightEntity->addComponent(pointLight);
lightEntity->addComponent(lightTransform);
// 3D Model
Qt3DCore::QEntity *objectEntity = new Qt3DCore::QEntity(rootEntity);
Qt3DRender::QSceneLoader *sceneLoader = new Qt3DRender::QSceneLoader(objectEntity);
// sceneLoader->setSource(QUrl("qrc:/Models/Cube.obj"));
sceneLoader->setSource(QUrl("qrc:/Models/Cube.dae"));
objectEntity->addComponent(sceneLoader);
Qt3DCore::QTransform *objectTransform = new Qt3DCore::QTransform(objectEntity);
objectTransform->setScale(10.f);
objectEntity->addComponent(objectTransform);
// Camera
Qt3DRender::QCamera *camera = this->camera();
camera->lens()->setPerspectiveProjection(
60.f, (float) this->width() / this->height(), 0.1f, 500.0f);
camera->setPosition(QVector3D(30.0f, 30.0f, 30.f));
camera->setViewCenter(QVector3D(0.f, 0.f, 0.f));
Qt3DExtras::QOrbitCameraController *cameraController =
new Qt3DExtras::QOrbitCameraController(rootEntity);
cameraController->setCamera(camera);
cameraController->setLookSpeed(180.f);
cameraController->setLinearSpeed(50.f);
this->setRootEntity(rootEntity);
}
};
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
Window w;
w.show();
return app.exec();
}
这是 Cube 的模型：
多维数据集
<?xml version="1.0" encoding="utf-8"?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
<asset>
<contributor>
<author>Blender User</author>
<authoring_tool>Blender 2.76.0 commit date:2015-10-11, commit time:06:55, hash:48f7dd6</authoring_tool>
</contributor>
<created>2020-12-10T01:55:11</created>
<modified>2020-12-10T01:55:11</modified>
<unit name="meter" meter="1"/>
<up_axis>Z_UP</up_axis>
</asset>
<library_images/>
<library_effects>
<effect id="BackgoundMaterial-effect">
<profile_COMMON>
<technique sid="common">
<phong>
<emission>
<color sid="emission">0 0 0 1</color>
</emission>
<ambient>
<color sid="ambient">0 0 0 1</color>
</ambient>
<diffuse>
<color sid="diffuse">0.07052612 0.64 0.02013014 1</color>
</diffuse>
<specular>
<color sid="specular">0.5 0.5 0.5 1</color>
</specular>
<shininess>
<float sid="shininess">50</float>
</shininess>
<index_of_refraction>
<float sid="index_of_refraction">1</float>
</index_of_refraction>
</phong>
</technique>
</profile_COMMON>
</effect>
<effect id="SideMaterial-effect">
<profile_COMMON>
<technique sid="common">
<phong>
<emission>
<color sid="emission">0 0 0 1</color>
</emission>
<ambient>
<color sid="ambient">0 0 0 1</color>
</ambient>
<diffuse>
<color sid="diffuse">0.64 0.06314375 0.129652 1</color>
</diffuse>
<specular>
<color sid="specular">0.5 0.5 0.5 1</color>
</specular>
<shininess>
<float sid="shininess">50</float>
</shininess>
<index_of_refraction>
<float sid="index_of_refraction">1</float>
</index_of_refraction>
</phong>
</technique>
</profile_COMMON>
</effect>
</library_effects>
<library_materials>
<material id="BackgoundMaterial-material" name="BackgoundMaterial">
<instance_effect url="#BackgoundMaterial-effect"/>
</material>
<material id="SideMaterial-material" name="SideMaterial">
<instance_effect url="#SideMaterial-effect"/>
</material>
</library_materials>
<library_geometries>
<geometry id="Cube-mesh" name="Cube">
<mesh>
<source id="Cube-mesh-positions">
<float_array id="Cube-mesh-positions-array" count="24">1 1 -1 1 -1 -1 -1 -0.9999998 -1 -0.9999997 1 -1 1 0.9999995 1 0.9999994 -1.000001 1 -1 -0.9999997 1 -1 1 1</float_array>
<technique_common>
<accessor source="#Cube-mesh-positions-array" count="8" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>
<source id="Cube-mesh-normals">
<float_array id="Cube-mesh-normals-array" count="36">0 0 -1 0 0 1 1 -5.96046e-7 3.27825e-7 -4.76837e-7 -1 0 -1 2.38419e-7 -1.19209e-7 2.08616e-7 1 0 0 0 -1 0 0 1 1 0 -2.38419e-7 0 -1 -4.76837e-7 -1 2.38419e-7 -1.49012e-7 2.68221e-7 1 2.38419e-7</float_array>
<technique_common>
<accessor source="#Cube-mesh-normals-array" count="12" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>
<vertices id="Cube-mesh-vertices">
<input semantic="POSITION" source="#Cube-mesh-positions"/>
</vertices>
<polylist material="BackgoundMaterial-material" count="10">
<input semantic="VERTEX" source="#Cube-mesh-vertices" offset="0"/>
<input semantic="NORMAL" source="#Cube-mesh-normals" offset="1"/>
<vcount>3 3 3 3 3 3 3 3 3 3 </vcount>
<p>0 0 1 0 2 0 7 1 6 1 5 1 5 3 6 3 2 3 2 4 6 4 7 4 0 5 3 5 7 5 3 6 0 6 2 6 4 7 7 7 5 7 1 9 5 9 2 9 3 10 2 10 7 10 4 11 0 11 7 11</p>
</polylist>
<polylist material="SideMaterial-material" count="2">
<input semantic="VERTEX" source="#Cube-mesh-vertices" offset="0"/>
<input semantic="NORMAL" source="#Cube-mesh-normals" offset="1"/>
<vcount>3 3 </vcount>
<p>4 2 5 2 1 2 0 8 4 8 1 8</p>
</polylist>
</mesh>
</geometry>
</library_geometries>
<library_controllers/>
<library_visual_scenes>
<visual_scene id="Scene" name="Scene">
<node id="Cube" name="Cube" type="NODE">
<matrix sid="transform">1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1</matrix>
<instance_geometry url="#Cube-mesh" name="Cube">
<bind_material>
<technique_common>
<instance_material symbol="BackgoundMaterial-material" target="#BackgoundMaterial-material"/>
<instance_material symbol="SideMaterial-material" target="#SideMaterial-material"/>
</technique_common>
</bind_material>
</instance_geometry>
</node>
</visual_scene>
</library_visual_scenes>
<scene>
<instance_visual_scene url="#Scene"/>
</scene>
</COLLADA>
立方体.obj
# Blender v2.93.5 OBJ File: ''
# www.blender.org
mtllib Cube.mtl
o Cube_Cube.001
v 1.000000 -1.000000 -1.000000
v 1.000000 -1.000000 1.000000
v -1.000000 -1.000000 1.000000
v -1.000000 -1.000000 -1.000000
v 1.000000 1.000000 -1.000000
v 0.999999 1.000000 1.000001
v -1.000000 1.000000 1.000000
v -1.000000 1.000000 -1.000000
vn 0.0000 -1.0000 0.0000
vn 0.0000 1.0000 0.0000
vn -0.0000 0.0000 1.0000
vn -1.0000 -0.0000 0.0000
vn 0.0000 0.0000 -1.0000
vn 1.0000 0.0000 0.0000
usemtl BackgoundMaterial
s off
f 1//1 2//1 3//1
f 8//2 7//2 6//2
f 6//3 7//3 3//3
f 3//4 7//4 8//4
f 1//5 4//5 8//5
f 4//1 1//1 3//1
f 5//2 8//2 6//2
f 2//3 6//3 3//3
f 4//4 3//4 8//4
f 5//5 1//5 8//5
usemtl SideMaterial
f 5//6 6//6 2//6
f 1//6 5//6 2//6
立方体.mtl
# Blender MTL File: 'None'
# Material Count: 2
newmtl BackgoundMaterial
Ns 225.000000
Ka 1.000000 1.000000 1.000000
Kd 0.070526 0.640000 0.020130
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2
newmtl SideMaterial
Ns 225.000000
Ka 1.000000 1.000000 1.000000
Kd 0.640000 0.063144 0.129652
Ks 0.500000 0.500000 0.500000
Ke 0.000000 0.000000 0.000000
Ni 1.000000
d 1.000000
illum 2
解决方案
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