/***********************************************************************//**
* @brief Return model value and set analytical gradients
*
* @param[in] photon Incident Photon.
*
* Evaluates the radial spatial model value and analytical model parameter
* gradients for a specific incident @p photon.
***************************************************************************/
double GModelSpatialRadial::eval_gradients(const GPhoton& photon) const
{
// Compute distance from source (in radians)
double theta = photon.dir().dist(dir());
// Evaluate model and set gradients
double value = eval_gradients(theta, photon.energy(), photon.time());
// Return result
return value;
}
/***********************************************************************//**
* @brief Return model value and set analytical gradients
*
* @param[in] srcDir True photon arrival direction.
*
* Evaluates the radial spatial model for a given true photon arrival
* direction.
***************************************************************************/
double GModelRadial::eval_gradients(const GSkyDir& srcDir) const
{
// Compute distance from source (in radians)
double theta = srcDir.dist(dir());
// Evaluate model and set gradients
double value = eval_gradients(theta);
// Return result
return value;
}