Caustics.cc

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#include <gra/reflection/Caustics.h>
#include <esg/visitor/PhotonMapBhvVisitor.h>

using namespace gra;

void Caustics::_illuminate(PointEnv& surr,
                           unsigned  actDepth,
                           bool      firstObjHit,
                           Color3f&  unused)
{
    /*
     * We suppose that the given "surr" contains proper point of intersection,
     * normal vector and associated primitive
     *
     * Transform point of intersection and properly orient normal
     */
    _check_point_of_intersection(surr);

    /*
     * Inspect attributes that are necessary for local illumination,
     * reflection and transmission. Set correct BRDF and emittance for local
     * reflection. If the point of interest is the second point of refraction
     * ray then previous material is used (the object was not changed)
     */
    MatVisitor* pMatVisitor = _check_material(surr.pVisitableObj, firstObjHit);

    const Vector3& refl   = pMatVisitor->reflection();
    const Vector3& transp = pMatVisitor->transparency();
    if (refl.x || refl.y || refl.z || transp.x || transp.y || transp.z) {
        /*
         * Traverse random direction using russian roulette
         */
        if (actDepth < _maxDepth) 
            _cast_secondary_rays(surr, actDepth, firstObjHit,
                                 unused, *pMatVisitor);
    } else {
        /*
         * store photon falled on a diffuse surface
         */
        _store_photon(surr, true);
    }
}

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