Vector.cpp

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/**<!-------------------------------------------------------------------->
   @file   Vector.cpp
   @author Travis Fischer (fisch0920@gmail.com)
   @date   Fall 2008
   
   @brief
      Provides basic functionality for a constant-sized Vector
   <!-------------------------------------------------------------------->**/

#include "Vector.h"
#include <Random.h>

// intentionally almost completely empty (see Vector.inl for implementation)

// Samples a random vector distributed according to a cosine-falloff about 
// the given normal vector (within the upward hemisphere defined by the 
// normal)
template <>
Vector3 Vector3::cosRandom(const Vector3 &normal) {
   const real_t theta = acos(sqrt(Random::sample()));
   const real_t phi   = 2.0 * M_PI * Random::sample();
   
   ASSERT(theta >= -EPSILON && theta <= M_PI / 2 + EPSILON);
   ASSERT(phi   >= -EPSILON && phi   <= M_PI * 2 + EPSILON);
   
   return convertHemisphere(theta, phi, normal);
}