C++ Polytope::contains方法代码示例

bool PrecipitationEffect::build(const osg::Vec3 eyeLocal, int i, int j, int k, float startTime, PrecipitationDrawableSet& pds, osg::Polytope& frustum, osgUtil::CullVisitor* cv) const
{
    osg::Vec3 position = _origin + osg::Vec3(float(i)*_du.x(), float(j)*_dv.y(), float(k+1)*_dw.z());
    osg::Vec3 scale(_du.x(), _dv.y(), -_dw.z());

    osg::BoundingBox bb(position.x(), position.y(), position.z()+scale.z(),
                        position.x()+scale.x(), position.y()+scale.y(), position.z());

    if (!frustum.contains(bb)) return false;

    osg::Vec3 center = position + scale*0.5f;
    float distance = (center-eyeLocal).length();

    osg::Matrix* mymodelview = 0;
    if (distance < _nearTransition)
    {
        PrecipitationDrawable::DepthMatrixStartTime& mstp = pds._quadPrecipitationDrawable->getCurrentCellMatrixMap()[PrecipitationDrawable::Cell(i,k,j)];
        mstp.depth = distance;
        mstp.startTime = startTime;
        mymodelview = &mstp.modelview;
    }
    else if (distance <= _farTransition)
    {
        if (_useFarLineSegments)
        {
            PrecipitationDrawable::DepthMatrixStartTime& mstp = pds._linePrecipitationDrawable->getCurrentCellMatrixMap()[PrecipitationDrawable::Cell(i,k,j)];
            mstp.depth = distance;
            mstp.startTime = startTime;
            mymodelview = &mstp.modelview;
        }
        else
        {
            PrecipitationDrawable::DepthMatrixStartTime& mstp = pds._pointPrecipitationDrawable->getCurrentCellMatrixMap()[PrecipitationDrawable::Cell(i,k,j)];
            mstp.depth = distance;
            mstp.startTime = startTime;
            mymodelview = &mstp.modelview;
        }
    }
    else
    {
        return false;
    }

    *mymodelview = *(cv->getModelViewMatrix());
    mymodelview->preMultTranslate(position);
    mymodelview->preMultScale(scale);

    cv->updateCalculatedNearFar(*(cv->getModelViewMatrix()),bb);

    return true;
}

//.........这里部分代码省略.........
#endif


#ifdef USE_TIMER
        t7 = timer.tick();
#endif


        if (cv->getComputeNearFarMode() != osgUtil::CullVisitor::DO_NOT_COMPUTE_NEAR_FAR)
            cv->updateCalculatedNearFar(matrix,_bbox);


        const float minimumIntensity = 1.0f/256.0f;
        const osg::Vec3 eyePoint = cv->getEyeLocal();

        double time=drawable->getSimulationTime();
        double timeInterval=drawable->getSimulationTimeInterval();

        const osg::Polytope clipvol(cv->getCurrentCullingSet().getFrustum());
        const bool computeClipping = false;//(clipvol.getCurrentMask()!=0);

        //LightPointDrawable::ColorPosition cp;
        for(LightPointList::iterator itr=_lightPointList.begin();
            itr!=_lightPointList.end();
            ++itr)
        {
            const LightPoint& lp = *itr;

            if (!lp._on) continue;

            const osg::Vec3& position = lp._position;

            // skip light point if it is not contianed in the view frustum.
            if (computeClipping && !clipvol.contains(position)) continue;

            // delta vector between eyepoint and light point.
            osg::Vec3 dv(eyePoint-position);

            float intensity = (_lightSystem.valid()) ? _lightSystem->getIntensity() : lp._intensity;

            // slip light point if its intensity is 0.0 or negative.
            if (intensity<=minimumIntensity) continue;

            // (SIB) Clip on distance, if close to limit, add transparancy
            float distanceFactor = 1.0f;
            if (_maxVisibleDistance2!=FLT_MAX)
            {
                if (dv.length2()>_maxVisibleDistance2) continue;
                else if (_maxVisibleDistance2 > 0)
                    distanceFactor = 1.0f - osg::square(dv.length2() / _maxVisibleDistance2);
            }

            osg::Vec4 color = lp._color;

            // check the sector.
            if (lp._sector.valid())
            {
                intensity *= (*lp._sector)(dv);

                // skip light point if it is intensity is 0.0 or negative.
                if (intensity<=minimumIntensity) continue;

            }

            // temporary accounting of intensity.
            //color *= intensity;

bool SiltEffect::build(const osg::Vec3 eyeLocal, int i, int j, int k, float startTime, SiltDrawableSet& pds, osg::Polytope& frustum, osgUtil::CullVisitor* cv) const
{
    osg::Vec3 position = _origin + osg::Vec3(float(i)*_du.x(), float(j)*_dv.y(), float(k+1)*_dw.z());
    osg::Vec3 scale(_du.x(), _dv.y(), -_dw.z());

    osg::BoundingBox bb(position.x(), position.y(), position.z()+scale.z(),
        position.x()+scale.x(), position.y()+scale.y(), position.z());

    if ( !frustum.contains(bb) ) 
        return false;

    osg::Vec3 center = position + scale*0.5f;
    float distance = (center-eyeLocal).length();

    osg::Matrix* mymodelview = 0;

    if (distance < _nearTransition)
    {
        SiltDrawable::DepthMatrixStartTime& mstp 
            = pds._quadSiltDrawable->getCurrentCellMatrixMap()[SiltDrawable::Cell(i,k,j)];
        
        mstp.depth = distance;
        mstp.startTime = startTime;
        mymodelview = &mstp.modelview;
    }
    else if (distance <= _farTransition)
    {
        SiltDrawable::DepthMatrixStartTime& mstp 
            = pds._pointSiltDrawable->getCurrentCellMatrixMap()[SiltDrawable::Cell(i,k,j)];
        
        mstp.depth = distance;
        mstp.startTime = startTime;
        mymodelview = &mstp.modelview;
    }
    else
    {
        return false;
    }

    *mymodelview = *(cv->getModelViewMatrix());

#if OPENSCENEGRAPH_MAJOR_VERSION > 2 || \
    (OPENSCENEGRAPH_MAJOR_VERSION == 2 && OPENSCENEGRAPH_MINOR_VERSION > 7) || \
    (OPENSCENEGRAPH_MAJOR_VERSION == 2 && OPENSCENEGRAPH_MINOR_VERSION == 7 && OPENSCENEGRAPH_PATCH_VERSION >= 3)

    // preMultTranslate and preMultScale introduced in rev 8868, which was 
    // before OSG 2.7.3.
    mymodelview->preMultTranslate(position);
    mymodelview->preMultScale(scale);

#else

    // Otherwise use unoptimized versions
    mymodelview->preMult(osg::Matrix::translate(position));
    mymodelview->preMult(osg::Matrix::scale(scale));

#endif

    cv->updateCalculatedNearFar(*(cv->getModelViewMatrix()),bb);

    return true;
}