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Visualization of complex industrial products and processes is a challenging problem connected with emerging collaborative environments and integrated product development technologies. Due to the large number of components and the complexity of their geometrical models, direct display of products and processes by current graphics systems at reasonable frame rates becomes impossible. One of the promising approaches to visualization of complex scenes is a simplification of polygonal models often hidden under the term level of details (LOD). Nowadays, different techniques, including hierarchical level of details (HLOD), are widely employed for visualization of large scenes by means of the geometry simplification and representation of entire groups of objects. However, both LOD and HLOD techniques face dramatic difficulties when scenes undergo modifications. Known attempts to adapt techniques for dynamic scenes did not result in significant progress. In the paper we present a concept of hierarchical dynamic level of details (HDLOD) and prove its feasibility and applicability to deterministic pseudo-dynamic scenes. Such scenes arise in various problems connected with visual modeling of complex construction projects, city infrastructure programs, and machinery assembly production. The results of computational experiments confirm the prospects of the introduced HDLODs and proposed complementary method for their automatic generation and application in industrial practice.
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