We present a new approach for incorporating boundary objects into fluid simulations performed with the method of Smoothed Particle Hydrodynamics. In our method collision and boundary objects are represented as polygonal meshes. The fluid interacts directly with these objects. However, unlike common approaches we do not employ intersection tests and reflections. Instead we correct the particle density through a continuous field. We further derive pressure and friction forces from this, which act on the particles that interact with the boundary object. Numerical experiments, which highlight the strengths and weaknesses of our method, are performed. Additionally, a comparison with a widely used method is presented. In the concluding remarks we discuss our method and come to the conclusion, that it requires improvements for some use cases, but has the potential to increase performance of coupled rigid-fluid simulations.