Abstract
This paper is devoted to the development of an algorithm for Levels-Of-Detail generation from skinned meshes. Animated meshes, unlike static ones, cannot be simplified without redistributing or recalculation bone weights. In some cases, objects of rendered scene have redundant details. It happens when their size on a screen, the distance from a virtual camera and other factors are such that there is no sense to display these objects in their full complexity, as it may significantly impact time for rendering one frame. One of the solutions is to create a set of Levels-Of-Detail for each object – a set of meshes and/or texture which represent same object, but with lower level of detail – and change the original object with them, when it is necessary. The simplification of visual models is especially important for visualisation of digital twins of real-world objects, subjects, or processes within the digital twin technology. An analysis of existing algorithms for Levels-Of-Detail generation for animated meshes is presented and discussed. An improved method for Levels-Of-Detail generation is introduced and discussed. The proposed method is based on Houle and Poulin animated mesh simplification. However, there are the following core differences in the proposed method: weights of resulting vertices are interpolated, not just copied; multiple poses are used for simplification input. These new features allow to achieve the animated meshes simplification without significant drawbacks in animation quality and mesh optimization.
Highlights
Animation is an important part of visual modelling in many application areas where objects to be visualised have dynamically changing shape and/or position
The digital twin visual model requires animation because the dynamicity is an obvious feature of any digital twin
«Системні технології» 6 (125) 2019 «System technologies» happens when their size on a screen, the distance from a virtual camera and other factors are such that there is no sense to display these objects in their full complexity, as it may significantly impact time for rendering one frame
Summary
Animation is an important part of visual modelling in many application areas where objects to be visualised have dynamically changing shape and/or position. The process of digital twin visualization is based on the real-time rendering. This method can be employed as a part of digital twin technology but for any other applications where skeletal animation is required. Most methods for articulated meshes simplification [3,4,5,6,7,8] work with edge collapse that makes it easier to calculate weights of the resulting mesh.
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