A method for spatially authoring data in a data processing system, may include constructing one or more input spatial geometry regions and iterating through each input spatial geometry region to create current cumulative result data and rejecting geometry groups from the current cumulative result data. The method may also include for each particular input spatial geometry region of the one or more input spatial geometry regions, constructing minimal-split BSP trees from the particular input spatial geometry region and current cumulative result data, performing geometry processing by applying an additive modeling comparison rule to keep geometry outside of the particular input spatial geometry region with the current cumulative result data, and keep geometry outside of the current cumulative result data with the particular input spatial geometry region, and performing geometry processing by applying a subtractive modeling comparison rule to keep geometry outside of the input spatial geometry region with the current cumulative result data, and keep geometry inside of the current cumulative result data with the particular input spatial geometry region. The method may further include generating final result geometry after iterating over all of the one or more input spatial geometry regions.