Qt 6.2.0, Qt3D. The COLLADA DAE model is darker than OBJ

8Observer8

Hello,

I am glad that the bug with loading COLLADA DAE files was fixed in Qt 6. But I have a strange problem: the COLLADA DAE model is darker than OBJ.

I created this cube in Blender 2.93:

With OBJ it works fine:

But when I export to DAE I see that the model is darker:

.pro

QT       += 3dcore 3dlogic 3dextras 3dinput

main.cpp

#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();
}

SGaist

Hi,

You should provide the model files as well so that people can test it.

8Observer8

Cube.dae

<?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>

Cube.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

Cube.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