f1402849
 dmayerich
renewed commit
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#include "rtsCubeSampler.h"
vector<vector3D> rtsCubeSampler::Evaluate()
{
/*This function evaluates the cube with the given parameters and returns
a vector of sample normalized sample vectors.*/
//find a valid up vector
vector3D u(0.0, 1.0, 0.0);
//calculate the side vector
vector3D s = u.cross(m_main_vector);
//orthogonalize the up vector
u = m_main_vector.cross(s);
//normalize all three vectors
m_main_vector.normalize();
u.normalize();
s.normalize();
//create a vector representing each side of the cube
vector3D sides[6];
sides[0] = m_main_vector;
sides[1] = (m_main_vector)*(-1);
sides[2] = u;
sides[3] = u*(-1);
sides[4] = s;
sides[5] = s*(-1);
//calculate the step size along the basis vectors for a side
double step = 1.0/((double)m_squared_samples_per_side);
//evaluate the cube, storing the result in an STL vector
vector<vector3D> result;
for(int k=0; k<6; k++)
for(int i=0; i<m_squared_samples_per_side; i++)
for(int j=0; j<m_squared_samples_per_side; j++)
{
//find the indices for the vectors representing the edges of the current side
unsigned int u_vector_index = (k+2)%6;
unsigned int v_vector_index = (k+4)%6;
//get two basis vectors for the side
vector3D u = sides[u_vector_index];
vector3D v = sides[v_vector_index];
//calculate a vector
vector3D adjustment = (u*2*(i*step+0.5*step) - u) + (v*2*(j*step + 0.5*step) - v);
vector3D final_vector = sides[k] + adjustment;
final_vector.normalize();
//test the angle and eliminate the vector if it is too large
double cosine_angle = final_vector*m_main_vector;
if(cosine_angle >= cos(TORADIANS(max_angle)))
result.push_back(final_vector);
}
//return the vector of results
return result;
}
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