Qt 3D: How to draw a cube with different textures on each face?

Question

I'm new to Qt 3D (C++), and while I'm training with my first 3D app, I couldn't achieve the following:

Creating a cube with 6 different textures on each face ... Until now, this is what I've tried:

// Cuboid shape data
    Qt3DExtras::QCuboidMesh *cuboid = new Qt3DExtras::QCuboidMesh();

    // CuboidMesh Transform
    Qt3DCore::QTransform *cuboidTransform = new Qt3DCore::QTransform();
    cuboidTransform->setScale(2.0f);

   Qt3DExtras::QTextureMaterial *textureMaterial = new Qt3DExtras::QTextureMaterial();
   Qt3DRender::QTextureCubeMap *cubMap = new Qt3DRender::QTextureCubeMap();

    Qt3DRender::QTextureImage *f1 = new Qt3DRender::QTextureImage();
    Qt3DRender::QTextureImage *f2 = new Qt3DRender::QTextureImage();
    Qt3DRender::QTextureImage *f3 = new Qt3DRender::QTextureImage();
    Qt3DRender::QTextureImage *f4 = new Qt3DRender::QTextureImage();
    Qt3DRender::QTextureImage *f5 = new Qt3DRender::QTextureImage();
    Qt3DRender::QTextureImage *f6 = new Qt3DRender::QTextureImage();

    f1->setSource(QUrl("qrc:/rc/images/cubemap1.png"));
    f1->setFace(Qt3DRender::QAbstractTexture::CubeMapNegativeX);
    f2->setSource(QUrl("qrc:/rc/images/cubemap2.png"));
    f2->setFace(Qt3DRender::QAbstractTexture::CubeMapPositiveX);
    f3->setSource(QUrl("qrc:/rc/images/cubemap3.png"));
    f3->setFace(Qt3DRender::QAbstractTexture::CubeMapNegativeY);
    f4->setSource(QUrl("qrc:/rc/images/cubemap4.png"));
    f4->setFace(Qt3DRender::QAbstractTexture::CubeMapPositiveY);
    f5->setSource(QUrl("qrc:/rc/images/cubemap5.png"));
    f5->setFace(Qt3DRender::QAbstractTexture::CubeMapNegativeZ);
    f6->setSource(QUrl("qrc:/rc/images/cubemap6.png"));
    f6->setFace(Qt3DRender::QAbstractTexture::CubeMapPositiveZ);

    cubMap->addTextureImage(f1);
    cubMap->addTextureImage(f2);
    cubMap->addTextureImage(f3);
    cubMap->addTextureImage(f4);
    cubMap->addTextureImage(f5);
    cubMap->addTextureImage(f6);

    textureMaterial->setTexture(cubMap);

    //Cuboid
    m_cuboidEntity = new Qt3DCore::QEntity(m_rootEntity);
    m_cuboidEntity->addComponent(cuboid);
    m_cuboidEntity->addComponent(textureMaterial);
    m_cuboidEntity->addComponent(cuboidTransform);

But it gives me a black cube . I've googled for an example, but all I find is written in OpenGl, which I'm not familiar with. I believe it's possible using Qt C++ Classes only.

I would appreciate your help.

Answer 1

This could be related to back face culling.

could you set the following in your renderer?

    activeFrameGraph: ForwardRenderer {
      ...
        frustumCulling: false
    }

When using Skybox (which is basically a CuboidMesh with different images on it), this is mandatory. Could be needed here too.

Answer 2

Try using f1->setSource(QUrl::fromLocalFile("...")); instead f1->setSource(QUrl("...")); , etc. And remember about Status