void randomSamplePointsInHemisphere( const vec3& normal, float angle, size_t n, vec3* out, random& seed )
{
assert( angle > 0.f && angle <= radians(90.f) );
assert( n > 0 );
assert( check(normal) );
randomSamplePointsOnHemisphere( normal, angle, n, out, seed );
// randomize lengths according to volume distribution (plain *=randomFloat() would put more weight on center)
for ( size_t i = 0 ; i < n ; ++i )
out[i] *= length( randomPointInSphere(seed) );
}
void ccSSAOFilter::initReflectTexture()
{
/*** INIT TEXTURE OF RELFECT VECTORS ***/
/** Fully random texture **/
int texSize = w*h;
std::vector<float> reflectTex;
try
{
reflectTex.resize(3*texSize);
}
catch(std::bad_alloc)
{
//not enough memory
return;
}
for (int i=0; i<texSize; i++)
{
double x,y,z;
randomPointInSphere(x,y,z);
double norm = x*x+y*y+z*z;
norm = (norm > 1.0e-12 ? 1.0/sqrt(norm) : 0.0);
reflectTex[i*3 ] = static_cast<float>((1.0+x*norm)/2);
reflectTex[i*3+1] = static_cast<float>((1.0+y*norm)/2);
reflectTex[i*3+2] = static_cast<float>((1.0+z*norm)/2);
}
glEnable(GL_TEXTURE_2D);
if (glIsTexture(texReflect))
glDeleteTextures(1,&texReflect);
glGenTextures(1,&texReflect);
glBindTexture(GL_TEXTURE_2D,texReflect);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGB16F,w,h,0,GL_RGB,GL_FLOAT,&reflectTex[0]);
glDisable(GL_TEXTURE_2D);
// According to Wikipedia, noise is made of 4*4 repeated tiles to have only high frequency **/
}
void ccSSAOFilter::initReflectTexture()
{
/*** INIT TEXTURE OF RELFECT VECTORS ***/
/** Fully random texture **/
int size = w*h;
float* p_reflect = new float[3*size];
if (!p_reflect)
{
//not enough memory!
return;
}
float* _p_reflect = p_reflect;
double x,y,z,norm;
for (int i=0;i<size;i++)
{
randomPointInSphere(x,y,z);
norm = x*x+y*y+z*z;
norm = (norm > 1e-12 ? 1.0/sqrt(norm) : 0.0);
*(_p_reflect++) = (float)(0.5*(1.0+x*norm));
*(_p_reflect++) = (float)(0.5*(1.0+y*norm));
*(_p_reflect++) = (float)(0.5*(1.0+z*norm));
}
TEX_2D_ON;
if (glIsTexture(texReflect))
glDeleteTextures(1,&texReflect);
glGenTextures(1,&texReflect);
glBindTexture(GL_TEXTURE_2D,texReflect);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGB16F,w,h,0,GL_RGB,GL_FLOAT,p_reflect);
TEX_2D_OFF;
delete[] p_reflect;
// According to Wikipedia, noise is made of 4*4 repeated tiles to have only high frequency **/
}
void CloudsVisualSystemBalloons::setBalloonPositions()
{
creditStartTime = ofGetElapsedTimef();
balloonFramStartTime = creditStartTime + 4;
balloonFramEndTime = balloonFramStartTime + 6;
vector<ofVec3f>pos(dimY*dimX);
vector<ofVec3f>vel(dimY*dimX);
if(releaseType == 0)
{
//sphere volume
for (int i=0; i<dimY; i++)
{
for(int j=0; j<dimX; j++)
{
pos[i*dimX + j] = randomPointInSphere(spawnRad, ofVec3f(0,-spawnRad, 0) );
}
}
pos[0].y = -spawnRad;
}
else if(releaseType == 1)
{
for (int i=0; i<dimY; i++)
{
for(int j=0; j<dimX; j++)
{
//PLANE
pos[i*dimX + j].set( j - dimY*.5, -10, i - dimY*.5);
pos[i*dimX + j] *= radius * .5;
}
}
}
//cos
else if(releaseType == 2)
{
float iStep = TWO_PI / dimY;
float jStep = TWO_PI / dimX;
for (int i=0; i<dimY; i++)
{
for(int j=0; j<dimX; j++)
{
pos[i*dimX + j].set( j - dimY*.5, -10 + cos(j * jStep) * cos(i * iStep) * 30, i - dimY*.5);
pos[i*dimX + j] *= radius;
}
}
}
//Bulge
else if(releaseType == 3)
{
float iStep = PI / dimY;
float jStep = PI / dimX;
for (int i=0; i<dimY; i++)
{
for(int j=0; j<dimX; j++)
{
pos[i*dimX + j].set( j - dimY*.5, sin(j * jStep) * sin(i * iStep), i - dimY*.5);
pos[i*dimX + j].x *= radius;
pos[i*dimX + j].y *= dim * .5;
pos[i*dimX + j].y -= dim * .75;
pos[i*dimX + j].z *= radius;
}
}
random_shuffle( pos.begin(), pos.end() );
swap(pos[0], pos[pos.size()/2]);
}
for(int i=0; i<vel.size(); i++)
{
// vel[i].set(0,ofRandom(-1.5, 3),0);
vel[i].set(0,ofRandom(0, 1),0);
}
//store data
//posiiton
posFbo0.allocate(dimX, dimY, GL_RGB32F);
posFbo0.getTextureReference().setTextureMinMagFilter(GL_NEAREST, GL_NEAREST);
posFbo0.getTextureReference().loadData( &pos[0][0], dimX, dimY, GL_RGB);
posFbo1.allocate(dimX, dimY, GL_RGB32F);
posFbo1.getTextureReference().setTextureMinMagFilter(GL_NEAREST, GL_NEAREST);
posFbo1.getTextureReference().loadData( &pos[0][0], dimX, dimY, GL_RGB);
//velocity
velFbo0.allocate(dimX, dimY, GL_RGB32F);
velFbo0.getTextureReference().setTextureMinMagFilter(GL_NEAREST, GL_NEAREST);
velFbo0.getTextureReference().loadData( &vel[0][0], dimX, dimY, GL_RGB);
velFbo1.allocate(dimX, dimY, GL_RGB32F);
velFbo1.getTextureReference().setTextureMinMagFilter(GL_NEAREST, GL_NEAREST);
velFbo1.getTextureReference().loadData( &vel[0][0], dimX, dimY, GL_RGB);
//rotations
quatFbo.allocate(dimX, dimY, GL_RGBA32F);
quatFbo.getTextureReference().setTextureMinMagFilter(GL_NEAREST, GL_NEAREST);
//color
setBalloonColors();
}