In many industrialized regions, increasing pressure on land supply is accelerating the use of hillside slopes for housing development. There are two key reasons for promoting hillside housing. First, it can help mitigate urban sprawl caused by unchecked population growth, which consumes valuable and fertile lowlands essential for agriculture and natural ecosystems. Second, due to rapid industrial development and high urban population density, environmental quality has significantly declined, making hillside development a more attractive and sustainable alternative. From an ecological perspective, the extinction of plain-dwelling species highlights the urgent need to conserve flatlands. Despite trends of urban decline, the exploitation of lowland areas for residential use continues to disrupt land-use balance. Developing suitable hillside areas can alleviate pressure on flatlands and promote more ethical land-use practices that preserve agricultural resources. Furthermore, hillside housing offers residents access to cleaner, less polluted environments with scenic views, upstream water sources, fresh air, and closer proximity to nature. However, such development must be carefully planned to protect these natural assets. This project explores the practical application of current computer software tools in site planning and landscape design, focusing on spatial relationships in areas with complex topography. The study is motivated by both the challenges of hillside development in Taiwan and advancements in 3D computer visualization. The aim is to evaluate the potential of these digital tools to generate better, more sustainable development alternatives. The feasibility and rationale of this approach are assessed based on findings from this investigation.