void ofApp::update()
{
if (trackingEnabled) {
videoGrabber.update();
if (videoGrabber.isFrameNew()) {
tracker.update(ofxCv::toCv(videoGrabber));
const ofVec2f& trackerPos = tracker.getPosition();
ofVec2f newCamPos((videoGrabber.getWidth()/2) - trackerPos.x,
(videoGrabber.getHeight()/2 - trackerPos.y));
cam.setPosition((newCamPos.x + trackerOffset.x) * trackerSensitivityX,
(newCamPos.y + trackerOffset.y) * trackerSensitivityY,
camZ - tracker.getScale() * trackerSensitivityZ);
}
} else {
cam.setPosition(camXY->getScaledValue().x, camXY->getScaledValue().y, camZ);
}
cam.update();
}
void ScatterSky::_getColor( const Point3F &pos, ColorF *outColor )
{
PROFILE_SCOPE( ScatterSky_GetColor );
F32 scaleOverScaleDepth = mScale / mRayleighScaleDepth;
F32 rayleighBrightness = mRayleighScattering * mSkyBrightness;
F32 mieBrightness = mMieScattering * mSkyBrightness;
Point3F invWaveLength( 1.0f / mWavelength4[0],
1.0f / mWavelength4[1],
1.0f / mWavelength4[2] );
Point3F v3Pos = pos / 6378000.0f;
v3Pos.z += mSphereInnerRadius;
Point3F newCamPos( 0, 0, smViewerHeight );
VectorF v3Ray = v3Pos - newCamPos;
F32 fFar = v3Ray.len();
v3Ray / fFar;
v3Ray.normalizeSafe();
Point3F v3Start = newCamPos;
F32 fDepth = mExp( scaleOverScaleDepth * (mSphereInnerRadius - smViewerHeight ) );
F32 fStartAngle = mDot( v3Ray, v3Start );
F32 fStartOffset = fDepth * _vernierScale( fStartAngle );
F32 fSampleLength = fFar / 2.0f;
F32 fScaledLength = fSampleLength * mScale;
VectorF v3SampleRay = v3Ray * fSampleLength;
Point3F v3SamplePoint = v3Start + v3SampleRay * 0.5f;
Point3F v3FrontColor( 0, 0, 0 );
for ( U32 i = 0; i < 2; i++ )
{
F32 fHeight = v3SamplePoint.len();
F32 fDepth = mExp( scaleOverScaleDepth * (mSphereInnerRadius - smViewerHeight) );
F32 fLightAngle = mDot( mLightDir, v3SamplePoint ) / fHeight;
F32 fCameraAngle = mDot( v3Ray, v3SamplePoint ) / fHeight;
F32 fScatter = (fStartOffset + fDepth * ( _vernierScale( fLightAngle ) - _vernierScale( fCameraAngle ) ));
Point3F v3Attenuate( 0, 0, 0 );
F32 tmp = mExp( -fScatter * (invWaveLength[0] * mRayleighScattering4PI + mMieScattering4PI) );
v3Attenuate.x = tmp;
tmp = mExp( -fScatter * (invWaveLength[1] * mRayleighScattering4PI + mMieScattering4PI) );
v3Attenuate.y = tmp;
tmp = mExp( -fScatter * (invWaveLength[2] * mRayleighScattering4PI + mMieScattering4PI) );
v3Attenuate.z = tmp;
v3FrontColor += v3Attenuate * (fDepth * fScaledLength);
v3SamplePoint += v3SampleRay;
}
Point3F mieColor = v3FrontColor * mieBrightness;
Point3F rayleighColor = v3FrontColor * (invWaveLength * rayleighBrightness);
Point3F v3Direction = newCamPos - v3Pos;
v3Direction.normalize();
F32 fCos = mDot( mLightDir, v3Direction ) / v3Direction.len();
F32 fCos2 = fCos * fCos;
F32 g = -0.991f;
F32 g2 = g * g;
F32 miePhase = _getMiePhase( fCos, fCos2, g, g2 );
Point3F color = rayleighColor + (miePhase * mieColor);
ColorF tmp( color.x, color.y, color.z, color.y );
Point3F expColor( 0, 0, 0 );
expColor.x = 1.0f - exp(-mExposure * color.x);
expColor.y = 1.0f - exp(-mExposure * color.y);
expColor.z = 1.0f - exp(-mExposure * color.z);
tmp.set( expColor.x, expColor.y, expColor.z, 1.0f );
if ( !tmp.isValidColor() )
{
F32 len = expColor.len();
if ( len > 0 )
expColor /= len;
}
outColor->set( expColor.x, expColor.y, expColor.z, 1.0f );
}
