vec3 ParticleFieldFunctions::flameold(vec4 pos) {
vec3 retVal ;
//double theta = getTheta(pos);
double scale = sin(0.8+(pos.y*M_PI*10))/40.0;
retVal.x = pos.x*scale;
retVal.z = pos.z*scale;
if ( ! pos.y >= 0.5 )
{
retVal *= -1.0 ;
}
retVal.y = ParticleSystem::rangeRandom(0.0015,0.0025) ;
//attractor code!!!
attractor atr_top ;
atr_top.power = 0.05 ;
atr_top.position = vec3(0.0, 0.15, 0.0) ;
atr_top.range = .02;
// get the distance from the attractor
vec3 woah = atr_top.position - xyz(pos) ;
float distanceSquare = length(woah) * length(woah);
if ( distanceSquare >= 0.05 ){
woah /= distanceSquare ;
}
woah *= atr_top.power ;
/*
if( length(atr_top.position -xyz(pos)) < atr_top.range)
{
retVal.x = retVal.x + woah.x ;
retVal.y = retVal.y + woah.y ;
retVal.z = retVal.z + woah.z ;
}
*/
return retVal;
}
vec3 ParticleFieldFunctions::up(vec4 pos, Parameters* parameters)
{
return vec3(0.0,0.005,0.0);
}
vec3 ParticleFieldFunctions::fixed(vec4 pos)
{
return vec3(0.0,0.0,0.0);
}