+ Host_Error("Mod_Q1BSP_RecursiveNodePortals: mislinked portal");
+ nextportal = portal->next[side];
+
+ other_node = portal->nodes[!side];
+ RemovePortalFromNodes(portal);
+
+ // cut the portal into two portals, one on each side of the node plane
+ PolygonD_Divide(portal->numpoints, portal->points, plane->normal[0], plane->normal[1], plane->normal[2], plane->dist, 1.0/32.0, MAX_PORTALPOINTS, frontpoints, &numfrontpoints, MAX_PORTALPOINTS, backpoints, &numbackpoints);
+
+ if (!numfrontpoints)
+ {
+ if (side == 0)
+ AddPortalToNodes(portal, back, other_node);
+ else
+ AddPortalToNodes(portal, other_node, back);
+ continue;
+ }
+ if (!numbackpoints)
+ {
+ if (side == 0)
+ AddPortalToNodes(portal, front, other_node);
+ else
+ AddPortalToNodes(portal, other_node, front);
+ continue;
+ }
+
+ // the portal is split
+ splitportal = AllocPortal();
+ temp = splitportal->chain;
+ *splitportal = *portal;
+ splitportal->chain = temp;
+ for (i = 0;i < numbackpoints*3;i++)
+ splitportal->points[i] = backpoints[i];
+ splitportal->numpoints = numbackpoints;
+ for (i = 0;i < numfrontpoints*3;i++)
+ portal->points[i] = frontpoints[i];
+ portal->numpoints = numfrontpoints;
+