C++ (Cpp) Spline::positionAtLength Exemples

Exemple #1

Fichier : FiretrailApp.cpp Projet : etienne-p/Firetrail

void FiretrailApp::update()
{
    const auto ray = mCamera.generateRay(getMousePos() - getWindowPos(), getWindowSize());
    float result = .0f;
    ray.calcPlaneIntersection(vec3(.0f, .0f, 5.0f), vec3(.0f, -2.0f, 1.0f), &result);
    
    mHeadPosition += (ray.calcPosition(result) - mHeadPosition) * .8f;
    mSpline.pushPoint(mHeadPosition);
    
    const auto length = mSpline.getLength();
    if (length <= .0f) return;
    
    auto mappedPosAttrib = mVboMesh->mapAttrib3f( geom::POSITION );
    
    const auto d = min(mMaxDSlice, length / (float)NUM_SPLINE_NODES);
    
    for (size_t i = 0; i < NUM_SPLINE_NODES; ++i)
    {
        *mappedPosAttrib++ = mSpline.positionAtLength(d * i);
    }
    
    mappedPosAttrib.unmap();
    
    mFps = getAverageFps();
    
    if (mRecordingMovie)
    {
        if( mMovieExporter && getElapsedFrames() > 1 && getElapsedFrames() < MAX_MOVIE_FRAMES )
        {
            mMovieExporter->addFrame( copyWindowSurface() );
        }
        else if( mMovieExporter && getElapsedFrames() >= MAX_MOVIE_FRAMES )
        {
            endMovieRecording();
        }
    }
}