+ if (max_node_level != liquid_level) {
+ // amount to gain, limited by viscosity
+ // must be at least 1 in absolute value
+ s8 level_inc = max_node_level - liquid_level;
+ u8 viscosity = content_features(liquid_kind).liquid_viscosity;
+ if (level_inc < -viscosity || level_inc > viscosity)
+ new_node_level = liquid_level + level_inc/viscosity;
+ else if (level_inc < 0)
+ new_node_level = liquid_level - 1;
+ else if (level_inc > 0)
+ new_node_level = liquid_level + 1;
+ if (new_node_level != max_node_level)
+ must_reflow.push_back(p0);
+ } else
+ new_node_level = max_node_level;
+