Canvas view camera element: Difference between revisions

{{Note|This is inspired by the long standing idea to render camera views to a texture for use as tailcams, gear views etc <ref>https://forum.flightgear.org/viewtopic.php?f=71&t=23929</ref>, it's based on code originally provided by F-JJTH<ref>https://forum.flightgear.org/viewtopic.php?f=71&t=23929#p317448</ref>, and subsequently reworked by Icecode GL and Hooray to integrate it with the Canvas system back in 2017<ref>https://forum.flightgear.org/viewtopic.php?f=47&t=32846&p=318046</ref>}}

<syntaxhighlight lang="diff">    diff --git a/src/Canvas/FGCanvasSystemAdapter.cxx b/src/Canvas/FGCanvasSystemAdapter.cxx

    index 72b20747e..9e04dbd14 100644

    --- a/src/Canvas/FGCanvasSystemAdapter.cxx

    +++ b/src/Canvas/FGCanvasSystemAdapter.cxx

    @@ -23,9 +23,18 @@

    #include <Network/HTTPClient.hxx>

    #include <Viewer/renderer.hxx>

    +

    +#include <Viewer/view.hxx>

    +#include <Viewer/viewmgr.hxx>

    +#include <simgear/scene/util/OsgMath.hxx>

    +

    +

    +

    #include <osgDB/ReadFile>

    #include <stdexcept>

    +#include <simgear/scene/model/modellib.hxx>

    +

    namespace canvas

    {

      //----------------------------------------------------------------------------

    @@ -64,9 +73,9 @@ namespace canvas

      }

      //----------------------------------------------------------------------------

    -  void FGCanvasSystemAdapter::addCamera(osg::Camera* camera) const

    +  void FGCanvasSystemAdapter::addCamera(osg::Camera* camera, bool useSceneData) const

      {

    -    globals->get_renderer()->addCamera(camera, false);

    +    globals->get_renderer()->addCamera(camera, useSceneData);

      }

      //----------------------------------------------------------------------------

    @@ -100,6 +109,46 @@ namespace canvas

        return 0;

      }

    +    //----------------------------------------------------------------------------

    +    // From http://wiki.flightgear.org/Howto:Extending_Canvas_to_support_rendering_3D_models#Extending_FGCanvasSystemAdapter

    +    osg::Node* FGCanvasSystemAdapter::getModel(const std::string& path) const

    +    {

    +        const char *model_path = "Models/Geometry/glider.ac";

    +        SGPath p(SGPath::fromUtf8(path));

    +

    +        if( p.isAbsolute() )

    +        {

    +            SGPath valid_path = fgValidatePath(p, false);

    +            if( !valid_path.isNull() )

    +            try {

    +                std::string fullPath = simgear::SGModelLib::findDataFile(valid_path.local8BitStr());

    +                osg::Node * object = simgear::SGModelLib::loadDeferredModel(fullPath, globals->get_props());

    +                return object;

    +            } catch (const sg_throwable& t) {

    +                SG_LOG(SG_IO, SG_ALERT, "Error loading " << model_path << ":\n  " << t.getFormattedMessage() << t.getOrigin());

    +                return 0;

    +            } // error loading from absolute path

    +            SG_LOG(SG_IO, SG_ALERT, "canvas::Model: reading '" << path << "' denied");

    +        } // absolute path handling

    +        else

    +        {

    +            SGPath tpath = globals->resolve_resource_path(path);

    +            if( !tpath.isNull() )

    +            try {

    +                std::string fullPath = simgear::SGModelLib::findDataFile(path.c_str());

    +                osg::Node * object = simgear::SGModelLib::loadDeferredModel(fullPath, globals->get_props());

    +                return object;

    +            } catch (const sg_throwable& t) {

    +                SG_LOG(SG_IO, SG_ALERT, "Error loading " << model_path << ":\n  " << t.getFormattedMessage() << t.getOrigin());

    +                return 0;

    +            } // error loading from relative path

    +

    +            SG_LOG(SG_IO, SG_ALERT, "canvas::Model: No such model: '" << path << "'");

    +        } // relative path handling

    +

    +        return 0;

    +    }

    +

      //----------------------------------------------------------------------------

      SGSubsystem*

      FGCanvasSystemAdapter::getSubsystem(const std::string& name) const

    @@ -121,4 +170,16 @@ namespace canvas

        return 0;

      }

    +  osg::Matrix FGCanvasSystemAdapter::getViewMatrix(int view_number, double dt) const

    +  {

    +        flightgear::View *view = globals->get_viewmgr()->get_view(view_number);

    +        view->update(dt);

    +

    +        osg::Vec3f position( toOsg(view->getViewPosition()) );

    +        osg::Quat orientation( toOsg(view->getViewOrientation()) );

    +        osg::Matrix viewMatrix( osg::Matrix::translate(-position) * osg::Matrix::rotate(orientation.inverse()) );

    +

    +        return viewMatrix;

    +  }

    +

    }

    diff --git a/src/Canvas/FGCanvasSystemAdapter.hxx b/src/Canvas/FGCanvasSystemAdapter.hxx

    index 4c1fd6210..24ececb41 100644

    --- a/src/Canvas/FGCanvasSystemAdapter.hxx

    +++ b/src/Canvas/FGCanvasSystemAdapter.hxx

    @@ -28,11 +28,13 @@ namespace canvas

      {

        public:

          virtual simgear::canvas::FontPtr getFont(const std::string& name) const;

    -      virtual void addCamera(osg::Camera* camera) const;

    +      virtual void addCamera(osg::Camera* camera, bool useSceneData = false) const;

          virtual void removeCamera(osg::Camera* camera) const;

          virtual osg::ref_ptr<osg::Image> getImage(const std::string& path) const;

    +      virtual osg::Node* getModel(const std::string& path) const;

          virtual SGSubsystem* getSubsystem(const std::string& name) const;

          virtual simgear::HTTP::Client* getHTTPClient() const;

    +      virtual osg::Matrix getViewMatrix(int view_number, double dt) const;

      };

    }

    diff --git a/src/Viewer/renderer.cxx b/src/Viewer/renderer.cxx

    index d9e8f351f..b9b3fc6a0 100644

    --- a/src/Viewer/renderer.cxx

    +++ b/src/Viewer/renderer.cxx

    @@ -1845,6 +1845,8 @@ FGRenderer::setEventHandler(FGEventHandler* eventHandler_)

    void

    FGRenderer::addCamera(osg::Camera* camera, bool useSceneData)

    {

    +    if (useSceneData)

    +        camera->addChild(globals->get_scenery()->get_scene_graph());

        _viewerSceneRoot->addChild(camera);

    }

 

<syntaxhighlight lang="diff">diff --git a/Nasal/canvas/api.nas b/Nasal/canvas/api.nas