By workingthrough this manual, you will gain skills in the construction, use of and modification of solids models Solids Modelling in Surpac 6. This document introduces the theory behind the solids modellingprocess and provides detailed examples using the solids modelling functions in Surpac. IntroductionSolids Modelling allows us to use triangulation to create three-dimensional models based on DigitalTerrain Models (DTMs) and String files.