Top, Left, Right, Bottom, Back View.

Support
, ,
2

Hi, Seram,

This is how I do “look at plane” (the 3 first button in your case):

void View3DWidget::onLookAtXY()
{
    //_renderer->ResetCamera();
    double *fp = _rendererMainScene->GetActiveCamera()->GetFocalPoint();
    double *p = _rendererMainScene->GetActiveCamera()->GetPosition();
    double dist
        = std::sqrt((p[0] - fp[0]) * (p[0] - fp[0]) + (p[1] - fp[1]) * (p[1] - fp[1])
                    + (p[2] - fp[2]) * (p[2] - fp[2]));
    _rendererMainScene->GetActiveCamera()->SetPosition(fp[0], fp[1], fp[2] + dist);
    _rendererMainScene->GetActiveCamera()->SetViewUp(0.0, 1.0, 0.0);
    // redraw the scene
    _vtkwidget->GetRenderWindow()->Render();
}

void View3DWidget::onLookAtXZ()
{
    double *fp = _rendererMainScene->GetActiveCamera()->GetFocalPoint();
    double *p = _rendererMainScene->GetActiveCamera()->GetPosition();
    double dist
        = std::sqrt((p[0] - fp[0]) * (p[0] - fp[0]) + (p[1] - fp[1]) * (p[1] - fp[1])
                    + (p[2] - fp[2]) * (p[2] - fp[2]));
    _rendererMainScene->GetActiveCamera()->SetPosition(fp[0], fp[1] - dist, fp[2]);
    _rendererMainScene->GetActiveCamera()->SetViewUp(0.0, 0.0, 1.0);
    // redraw the scene
    _vtkwidget->GetRenderWindow()->Render();
}

void View3DWidget::onLookAtYZ()
{
    double *fp = _rendererMainScene->GetActiveCamera()->GetFocalPoint();
    double *p = _rendererMainScene->GetActiveCamera()->GetPosition();
    double dist
        = std::sqrt((p[0] - fp[0]) * (p[0] - fp[0]) + (p[1] - fp[1]) * (p[1] - fp[1])
                    + (p[2] - fp[2]) * (p[2] - fp[2]));
    _rendererMainScene->GetActiveCamera()->SetPosition(fp[0] + dist, fp[1], fp[2]);
    _rendererMainScene->GetActiveCamera()->SetViewUp(0.0, 0.0, 1.0);
    // redraw the scene
    _vtkwidget->GetRenderWindow()->Render();
}

For the other 3 buttons, you need to swap the signs of the sums/diffs in the _rendererMainScene->GetActiveCamera()->SetPosition() calls (e.g. from fp[0] + dist to fp[0] - dist);

I hope this helps,

regards,

Paulo

1 Like