//-----------------------------------------------------------------------------
SLLight::SLLight(SLfloat ambiPower,
SLfloat diffPower,
SLfloat specPower,
SLint id)
{
// Set parameter of SLLight
_id = id;
_on = true;
_spotCutoff = 180.0f;
_spotCosCut = cos(SL_DEG2RAD*_spotCutoff);
_spotExponent = 1.0f;
// Set parameters of inherited SLMaterial
_ambient.set (ambiPower, ambiPower, ambiPower);
_diffuse.set (diffPower, diffPower, diffPower);
_specular.set(specPower, specPower, specPower);
// By default there is no attenuation set. This is physically not correct
// Default OpenGL: kc=1, kl=0, kq=0
// Physically correct: kc=0, kl=0, kq=1
// set quadratic attenuation with d = distance to light
// 1
// attenuation = ------------------
// kc + kl*d + kq*d*d
kc(1.0f);
kl(0.0f);
kq(0.0f);
}
double physics::f_lo_plus (double E)
{
return kq(E)*(nq+1 )*log(( 1 +sqrt( 1 +(hw/E)))/( 1 -sqrt( 1 -(hw/E))));
}
double physics::f_lo_minus (double E)
{
return kq(E)*nq * log(( 1 +sqrt( 1 +(hw/E)))/(sqrt( 1 +(hw/E))- 1));
}