This article discusses the problem of point object placement in 3D space for the purposes of visualization. We have to deal with this kind of task, when we have to place objects on a DTM (Digital Terrain Model), which most often is an irregular triangle grid. Unfortunately, the case when the point objects are placed on a horizontal surface is very rare. This is the reason why there is a need for a technology that allows us to prepare the data required to work on the digital terrain coverage model development. The approach presented is an attempt to solve this problem in a simplified yet sufficient model for this kind of elaborations.