5 int Portal_CheckPolygon(model_t *model, vec3_t eye, float *polypoints, int numpoints);
6 int Portal_CheckBox(model_t *model, vec3_t eye, vec3_t a, vec3_t b);
7 void Portal_Visibility(model_t *model, const vec3_t eye, qbyte *leafmark, qbyte *surfacemark, const mplane_t *frustumplanes, int numfrustumplanes, int exact, const float *boxmins, const float *boxmaxs, float *updateleafsmins, float *updateleafsmaxs);