source: GTP/trunk/App/Demos/Vis/CHC_revisited/SceneQuery.cpp @ 2778

#include "SceneQuery.h"
#include "glInterface.h"
#include "Vector3.h"
#include "Camera.h"
#include "SceneQuery.h"
#include "RenderTraverser.h"


void startil();
void stopil();


namespace CHCDemoEngine
{

using namespace std;


const static int viewport[4] = {0, 0, 512, 512};
//static DepthComponent<float> *sDepth = NULL;



SceneQuery::SceneQuery(const AxisAlignedBox3 &sceneBox, RenderTraverser *renderer): 
mSceneBox(sceneBox)
{
        Prepare(renderer);
}


bool SceneQuery::CalcIntersection(Vector3 &pt)
{
        int px = (pt.x - mSceneBox.Min(0)) * (viewport[2] - 1) / mSceneBox.Size(0);
        int py = (pt.y - mSceneBox.Min(2)) * (viewport[3] - 1) /  mSceneBox.Size(2);

        const float d = 1.0f;// - sDepth->getPixel(px, py);

        if (d > 0.0f)
        {
                pt.z = mSceneBox.Size(2) * d + mSceneBox.Min(2);
                cout << "new depth " << pt.z << " (" << d << ")" << endl;

                return true;
        }

        return false;
}


void SceneQuery::Prepare(RenderTraverser *renderer)
{
        cout << "Preparing scene queries" << endl;

        // center camera on "highest" point
        Vector3 pos;

        pos.x = mSceneBox.Center(0);
        pos.y = mSceneBox.Max(1);
        pos.z = mSceneBox.Center(2);

        // for ortho cam this is the width
        const Vector3 len = mSceneBox.Size();

        Camera *orthoCam = new Camera(len.x, len.y);
        orthoCam->SetOrtho(true);

        orthoCam->SetNear(0.0f);
        orthoCam->SetFar(len.z);

        orthoCam->SetPosition(pos);

        cout << "fov: " << orthoCam->GetFov() << endl;
        cout << "near: " << orthoCam->GetNear() << endl;
        cout << "far: " << orthoCam->GetFar() << endl;
        cout << "aspect: " << orthoCam->GetAspect() << endl;

        cout << "pos: " << orthoCam->GetPosition() << endl;
        cout << "view: " << orthoCam->GetDirection() << endl;
        cout << "up: " << orthoCam->GetUpVector() << endl;

        //orthoCam->SetDirection(Vector3(0, 1, 0));
        orthoCam->Yaw(M_PI * 0.5f);
        
        renderer->SetCamera(orthoCam);

        //OffscreenRenderArea *of = new OffscreenRenderArea();
        //of->Init(viewport[2], viewport[3]);

        renderer->RenderScene();
        //sDepth = of->GetDepthFloat();

        delete orthoCam;
}

}