Thank you all so much for your help on this. Generally speaking, what is
the proper approach if I want to set the initial view to a specific look-at
but after that I want the default manipulator to behave as normal?
On Tuesday, April 21, 2020 at 1:43:45 AM UTC-5, Erik Hensens wrote:
>
> Hello everyone,
>
> I am trying to change the camera's perspective by calling
> setViewMatrixAsLookAt, but it is not making any change in the orientation
> of my scene. Here is the full code for the simplest application that
> reproduces my problem. There must be something I'm fundamentally
> misunderstanding here. I appreciate any and all help! Thanks in advance!
>
> #include <osg/Geode>
> #include <osg/ShapeDrawable>
> #include <osgViewer/Viewer>
>
>
> // Get a new sphere geode
> osg::ref_ptr<osg::Geode> CreateSphereGeode(
> osg::Vec3 tCenter, // The location of the center of the sphere
> osg::Vec4 tColor, // The color of the sphere
> float fRadius // The sphere radius
> )
> {
> // Create the geode to return
> osg::ref_ptr<osg::Geode> pRetv = new osg::Geode;
>
>
> // Create the sphere
> osg::ref_ptr<osg::Sphere> pSphere = new osg::Sphere(tCenter, fRadius);
>
>
> // Create the drawable
> osg::ref_ptr<osg::ShapeDrawable> pSphereDrawable = new osg::ShapeDrawable
> (pSphere);
>
>
> // Set the color
> pSphereDrawable->setColor(tColor);
>
>
> // Add the drawable
> pRetv->addDrawable(pSphereDrawable);
>
>
> // Return this geode
> return pRetv;
> }
>
>
> // The main application entry point
> int main(int argc, char *argv[])
> {
> // Create the viewer
> osg::ref_ptr<osgViewer::Viewer> pViewer = new osgViewer::Viewer;
>
> // Create the top group parent
> osg::ref_ptr<osg::Group> pTopGroup = new osg::Group;
>
>
> // Create some spheres
> osg::ref_ptr<osg::Geode> pSphere1 = CreateSphereGeode(osg::Vec3(0.0f,
> 0.0f, 0.0f), osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f), 2.0f);
> osg::ref_ptr<osg::Geode> pSphere2 = CreateSphereGeode(osg::Vec3(10.0f,
> 0.0f, 5.0f), osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f), 1.0f);
> osg::ref_ptr<osg::Geode> pSphere3 = CreateSphereGeode(osg::Vec3(-15.0f,
> 6.0f, 0.0f), osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f), 4.0f);
>
>
> // Add these spheres to the top group node
> pTopGroup->addChild(pSphere1);
> pTopGroup->addChild(pSphere2);
> pTopGroup->addChild(pSphere3);
>
>
> // Here I am attempting to change the initial perspective, but I can
> make these numbers anything and it doesn't seem to change anything
> pViewer->getCamera()->setViewMatrixAsLookAt(
> osg::Vec3(-0.9983f, 0.0252f, -0.0530f),
> osg::Vec3(0.8639f, -2.5189f, -70.0939f),
> osg::Vec3(0.8880f, -1.5194f, -70.0726f)
> );
>
> // Add a viewport to the viewer and attach the scene graph
> pViewer->setSceneData(pTopGroup);
>
>
> // Run the viewer
> return pViewer->run();
> }
>
>
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