void TrailGroup::draw(StelCore* core, StelPainter* sPainter)
{
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
float currentTime = core->getJDE();
StelProjector::ModelViewTranformP transfo = core->getJ2000ModelViewTransform();
transfo->combine(j2000ToTrailNativeInverted);
sPainter->setProjector(core->getProjection(transfo));
foreach (const Trail& trail, allTrails)
{
Planet* hpl = dynamic_cast<Planet*>(trail.stelObject.data());
if (hpl!=NULL)
{
// Avoid drawing the trails if the object is the home planet
QString homePlanetName = hpl->getEnglishName();
if (homePlanetName==StelApp::getInstance().getCore()->getCurrentLocation().planetName)
continue;
}
const QList<Vec3d>& posHistory = trail.posHistory;
vertexArray.resize(posHistory.size());
colorArray.resize(posHistory.size());
for (int i=0;i<posHistory.size();++i)
{
float colorRatio = 1.f-(currentTime-times.at(i))/timeExtent;
colorArray[i].set(trail.color[0], trail.color[1], trail.color[2], colorRatio*opacity);
vertexArray[i]=posHistory.at(i);
}
sPainter->drawPath(vertexArray, colorArray);
}
void Comet::drawComa(StelCore* core, StelProjector::ModelViewTranformP transfo)
{
// Find rotation matrix from 0/0/1 to viewdirection! crossproduct for axis (normal vector), dotproduct for angle.
Vec3d eclposNrm=eclipticPos - core->getObserverHeliocentricEclipticPos() ; eclposNrm.normalize();
Mat4d comarot=Mat4d::rotation(Vec3d(0.0, 0.0, 1.0)^(eclposNrm), std::acos(Vec3d(0.0, 0.0, 1.0).dot(eclposNrm)) );
StelProjector::ModelViewTranformP transfo2 = transfo->clone();
transfo2->combine(comarot);
StelPainter* sPainter = new StelPainter(core->getProjection(transfo2));
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
glDisable(GL_CULL_FACE);
// GZ: For the coma, we can use extinction via atmosphere.
// In addition, light falloff is a bit reduced for better visibility. Power basis should be 0.4, we use 0.6.
float minSkyMag=core->getSkyDrawer()->getLimitMagnitude();
float mag100pct=minSkyMag-6.0f; // should be 5, but let us draw it a bit brighter.
float magDrop=getVMagnitudeWithExtinction(core)-mag100pct;
float magFactor=std::pow(0.6f , magDrop);
magFactor=qMin(magFactor, 2.0f); // Limit excessively bright display.
comaTexture->bind();
sPainter->setColor(magFactor,magFactor,0.6f*magFactor);
sPainter->setArrays((Vec3d*)comaVertexArr.constData(), (Vec2f*)comaTexCoordArr.constData());
sPainter->drawFromArray(StelPainter::Triangles, comaVertexArr.size()/3);
glDisable(GL_BLEND);
if (sPainter)
delete sPainter;
sPainter=NULL;
}
void TrailGroup::draw(StelCore* core, StelRenderer* renderer)
{
renderer->setBlendMode(BlendMode_Alpha);
float currentTime = core->getJDay();
StelProjector::ModelViewTranformP transfo = core->getJ2000ModelViewTransform();
transfo->combine(j2000ToTrailNativeInverted);
StelProjectorP projector = core->getProjection(transfo);
// We skip some positions to avoid drawing too many vertices when the history is long.
int totalPositions = 0;
foreach(const Trail& trail, allTrails)
{
totalPositions += trail.posHistory.size();
}
const int desiredMaxTotalTrailVertices = 8192;
const int skip = std::max(1, totalPositions / desiredMaxTotalTrailVertices);
for(int t = 0; t < allTrails.size(); t++)
{
Trail& trail(allTrails[t]);
Planet* hpl = dynamic_cast<Planet*>(trail.stelObject.data());
if (hpl != NULL)
{
// Avoid drawing the trails if the object is the home planet
QString homePlanetName = hpl == NULL ? "" : hpl->getEnglishName();
if (homePlanetName == StelApp::getInstance().getCore()->getCurrentLocation().planetName)
{
continue;
}
}
const QVector<Vec3f>& posHistory = trail.posHistory;
// Construct the vertex buffer if not yet constructed, otherwise clear it.
if(NULL == trail.vertexBuffer)
{
trail.vertexBuffer =
renderer->createVertexBuffer<ColoredVertex>(PrimitiveType_LineStrip);
}
else
{
trail.vertexBuffer->unlock();
trail.vertexBuffer->clear();
}
// Hand-optimized as this previously took up to 9% of time when
// trail groups were enabled. Now it's up to 3%. Further optimization
// is possible, but would lead to more uglification.
int posCount = posHistory.size();
int p = 0;
const float timeMult = 1.0f / timeExtent;
ColoredVertex vertex;
for (p = 0; p < posCount - 1; ++p)
{
// Skip if too many positions, but don't skip the last position.
if(p % skip != 0)
{
continue;
}
const float colorRatio = 1.0f - (currentTime - times.at(p)) * timeMult;
vertex.color = Vec4f(trail.color[0], trail.color[1], trail.color[2], colorRatio * opacity);
vertex.position = posHistory.at(p);
trail.vertexBuffer->addVertex(vertex);
}
// Last vertex (separate to avoid a branch in the code above)
const float colorRatio = 1.0f - (currentTime - times.at(p)) * timeMult;
vertex.color = Vec4f(trail.color[0], trail.color[1], trail.color[2], colorRatio * opacity);
vertex.position = posHistory.at(p);
trail.vertexBuffer->addVertex(vertex);
trail.vertexBuffer->lock();
renderer->drawVertexBuffer(trail.vertexBuffer, NULL, projector);
}
}
void Comet::drawTail(StelCore* core, StelProjector::ModelViewTranformP transfo, bool gas)
{
// Find rotation matrix from 0/0/1 to eclipticPosition: crossproduct for axis (normal vector), dotproduct for angle.
Vec3d eclposNrm=eclipticPos; eclposNrm.normalize();
Mat4d tailrot=Mat4d::rotation(Vec3d(0.0, 0.0, 1.0)^(eclposNrm), std::acos(Vec3d(0.0, 0.0, 1.0).dot(eclposNrm)) );
StelProjector::ModelViewTranformP transfo2 = transfo->clone();
transfo2->combine(tailrot);
if (!gas) {
CometOrbit* orbit=(CometOrbit*)userDataPtr;
Vec3d velocity=orbit->getVelocity(); // [AU/d]
// This was a try to rotate a straight parabola somewhat away from the antisolar direction.
//Mat4d dustTailRot=Mat4d::rotation(eclposNrm^(-velocity), 0.15f*std::acos(eclposNrm.dot(-velocity))); // GZ: This scale factor of 0.15 is empirical from photos of Halley and Hale-Bopp.
// The curved tail is curved towards positive X. We first rotate around the Z axis into a direction opposite of the motion vector, then again the antisolar rotation applies.
Mat4d dustTailRot=Mat4d::zrotation(atan2(velocity[1], velocity[0]) + M_PI);
transfo2->combine(dustTailRot);
// In addition, we let the dust tail already start with a light tilt.
Mat4d dustTailYrot=Mat4d::yrotation(5.0f*velocity.length()); // again, this is pretty ad-hoc, feel free to improve!
transfo2->combine(dustTailYrot);
}
StelPainter* sPainter = new StelPainter(core->getProjection(transfo2));
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
glDisable(GL_CULL_FACE);
// GZ: If we use getVMagnitudeWithExtinction(), a head extincted in the horizon mist can completely hide an otherwise frighteningly long tail.
// we must use unextincted mag, but mix/dim with atmosphere/sky brightness.
// In addition, light falloff is a bit reduced for better visibility. Power basis should be 0.4, we use 0.6.
//float magfactor=std::pow(0.4f , getVMagnitudeWithExtinction(core));
float magFactor=std::pow(0.6f , getVMagnitude(core));
if (core->getSkyDrawer()->getFlagHasAtmosphere())
{
// Mix with sky brightness and light pollution: This is very ad-hoc, if someone finds a better solution, please go ahead!
// Light pollution:
float bortleIndexFactor=0.1f * (11 - core->getSkyDrawer()->getBortleScaleIndex());
magFactor*= bortleIndexFactor*bortleIndexFactor; // GZ-Guesstimate for light pollution influence
// sky brightness: This is about 10 for twilight where bright comet tails should already be visible. Dark night is close to 0.
float avgAtmLum=GETSTELMODULE(LandscapeMgr)->getAtmosphereAverageLuminance();
float atmLumFactor=(15.0f-avgAtmLum)/15.0f; if (atmLumFactor<0.05f) atmLumFactor=0.05f; //atmLumFactor=std::sqrt(atmLumFactor);
magFactor*=atmLumFactor*atmLumFactor;
}
magFactor*=(gas? 0.9 : dustTailBrightnessFactor); // TBD: empirical adjustment for texture brightness.
magFactor=qMin(magFactor, 1.05f); // Limit excessively bright display.
gasTailTexture->bind();
if (gas) {
//gasTailTexture->bind();
sPainter->setColor(0.15f*magFactor,0.15f*magFactor,0.6f*magFactor);
sPainter->setArrays((Vec3d*)gastailVertexArr.constData(), (Vec2f*)gastailTexCoordArr.constData());
sPainter->drawFromArray(StelPainter::Triangles, gastailIndices.size(), 0, true, gastailIndices.constData());
} else {
//dustTailTexture->bind();
sPainter->setColor(magFactor, magFactor,0.6f*magFactor);
//sPainter->setArrays((Vec3d*)dusttailVertexArr.constData(), (Vec2f*)dusttailTexCoordArr.constData());
//sPainter->drawFromArray(StelPainter::Triangles, dusttailIndices.size(), 0, true, dusttailIndices.constData());
sPainter->setArrays((Vec3d*)dusttailVertexArr.constData(), (Vec2f*)gastailTexCoordArr.constData());
sPainter->drawFromArray(StelPainter::Triangles, gastailIndices.size(), 0, true, gastailIndices.constData());
}
glDisable(GL_BLEND);
if (sPainter)
delete sPainter;
sPainter=NULL;
}
// Draw the Comet and all the related infos : name, circle etc... GZ: Taken from Planet.cpp 2013-11-05 and extended
void Comet::draw(StelCore* core, float maxMagLabels, const QFont& planetNameFont)
{
if (hidden)
return;
if (getEnglishName() == core->getCurrentLocation().planetName)
{ // GZ moved this up. Maybe even don't do that? E.g., draw tail while riding the comet? Decide later.
return;
}
// The CometOrbit is in fact available in userDataPtr!
CometOrbit* orbit=(CometOrbit*)userDataPtr;
Q_ASSERT(orbit);
if (!orbit->objectDateValid(core->getJDay())) return; // out of useful date range. This allows having hundreds of comet elements.
if (orbit->getUpdateTails()){
// Compute lengths and orientations from orbit object, but only if required.
// TODO: This part should possibly be moved to another thread to keep draw() free from too much computation.
Vec2f tailFactors=getComaDiameterAndTailLengthAU();
float gasTailEndRadius=qMax(tailFactors[0], 0.025f*tailFactors[1]) ; // This avoids too slim gas tails for bright comets like Hale-Bopp.
float gasparameter=gasTailEndRadius*gasTailEndRadius/(2.0f*tailFactors[1]); // parabola formula: z=r²/2p, so p=r²/2z
// The dust tail is thicker and usually shorter. The factors can be configured in the elements.
float dustparameter=gasTailEndRadius*gasTailEndRadius*dustTailWidthFactor*dustTailWidthFactor/(2.0f*dustTailLengthFactor*tailFactors[1]);
// Find valid parameters to create paraboloid vertex arrays: dustTail, gasTail.
computeParabola(gasparameter, gasTailEndRadius, -0.5f*gasparameter, gastailVertexArr, gastailTexCoordArr, gastailIndices);
// This was for a rotated straight parabola:
//computeParabola(dustparameter, 2.0f*tailFactors[0], -0.5f*dustparameter, dusttailVertexArr, dusttailTexCoordArr, dusttailIndices);
// Now we make a skewed parabola. Skew factor 15 (last arg) ad-hoc/empirical. TBD later: Find physically correct solution.
computeParabola(dustparameter, dustTailWidthFactor*gasTailEndRadius, -0.5f*dustparameter, dusttailVertexArr, gastailTexCoordArr, gastailIndices, 25.0f*orbit->getVelocity().length());
// Note that we use a diameter larger than what the formula returns. A scale factor of 1.2 is ad-hoc/empirical (GZ), but may look better.
computeComa(1.0f*tailFactors[0]);
orbit->setUpdateTails(false); // don't update until position has been recalculated elsewhere
}
Mat4d mat = Mat4d::translation(eclipticPos) * rotLocalToParent;
/* // We can remove that - a Comet has no parent except for the sun...
PlanetP p = parent;
while (p && p->parent)
{
mat = Mat4d::translation(p->eclipticPos) * mat * p->rotLocalToParent;
p = p->parent;
}
*/
// This removed totally the Planet shaking bug!!!
StelProjector::ModelViewTranformP transfo = core->getHeliocentricEclipticModelViewTransform();
transfo->combine(mat);
// Compute the 2D position and check if in the screen
const StelProjectorP prj = core->getProjection(transfo);
float screenSz = getAngularSize(core)*M_PI/180.*prj->getPixelPerRadAtCenter();
float viewport_left = prj->getViewportPosX();
float viewport_bottom = prj->getViewportPosY();
if (prj->project(Vec3d(0), screenPos)
&& screenPos[1]>viewport_bottom - screenSz && screenPos[1] < viewport_bottom + prj->getViewportHeight()+screenSz
&& screenPos[0]>viewport_left - screenSz && screenPos[0] < viewport_left + prj->getViewportWidth() + screenSz)
{
// Draw the name, and the circle if it's not too close from the body it's turning around
// this prevents name overlapping (ie for jupiter satellites)
float ang_dist = 300.f*atan(getEclipticPos().length()/getEquinoxEquatorialPos(core).length())/core->getMovementMgr()->getCurrentFov();
// if (ang_dist==0.f) ang_dist = 1.f; // if ang_dist == 0, the Planet is sun.. --> GZ: we can remove it.
// by putting here, only draw orbit if Comet is visible for clarity
drawOrbit(core); // TODO - fade in here also...
if (flagLabels && ang_dist>0.25 && maxMagLabels>getVMagnitude(core))
{
labelsFader=true;
}
else
{
labelsFader=false;
}
drawHints(core, planetNameFont);
draw3dModel(core,transfo,screenSz);
}
// tails should also be drawn if core is off-screen...
drawTail(core,transfo,true); // gas tail
drawTail(core,transfo,false); // dust tail
//Coma: this is just a fan disk tilted towards the observer;-)
drawComa(core, transfo);
return;
}
