IntersectData AABB::IntersectAABB(const AABB& other) const
{
//The distance between the AABB's on the X, Y, and Z axis.
//Computed twice because there are two possible valid distances, depending
//on the location of the AABB's.
Vector3f distances1 = other.GetMinExtents() - m_maxExtents;
Vector3f distances2 = m_minExtents - other.GetMaxExtents();
//The correct distances will be whichever distance is larger for that
//particular axis.
Vector3f distances = Vector3f(distances1.Max(distances2));
float maxDistance = distances.Max();
//If there is any distance between the two AABB's, then max distance will
//be greather than or equal to 0. If there is distance between the two
//AABBs, then they aren't intersecting.
//
//Therefore, if the AABBs are intersecting, then the distance between them
//must be less than zero.
//TODO: This might actually need to return the minDistance if they are
//intersecting.
return IntersectData(maxDistance < 0, maxDistance);
}
PointLight::PointLight(const Vector3f& color, float intensity, const Attenuation& attenuation, const Shader& shader) :
BaseLight(color, intensity, shader),
m_attenuation(attenuation)
{
float a = m_attenuation.GetExponent();
float b = m_attenuation.GetLinear();
float c = m_attenuation.GetConstant() - COLOR_DEPTH * intensity * color.Max();
m_range = (-b + sqrtf(b*b - 4*a*c))/(2*a);
}