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ETL format is a newly proposed CAD format, which is both simple enough that CAD models in this format can be easily sliced, and capable of describing solids with arbitrarily complex surface details. This paper aims to provide a method for slicing CAD models in ETL format.

The proposed slicing method is based on a method for slicing CAD models in colour STL format. Affine mapping method is used to calculate the colour of the intersection polygon of a voxel in the slicing result volume dataset, and a triangular facet that constitutes the geometry of the described object, when the facet has texture mapping definition.

The proposed slicing method is simple and robust. Implementations have demonstrated its feasibility.

The proposed slicing method is meaningful to preparing data for the rapid formation of models with complex surface details, including colour and textures.

This paper studies how government subsidies (GS) and extended warranties (EW) feed decision-making about low-quality recycled used products (RUP) in closed-loop supply chains (CLSC).

The authors use the Stackelberg game and numerical simulation to analyze how the quality of RUP affects decision-making about remanufacturing and EW.

The results show that (1) low-quality RUP will weaken the environmental and economic value of EW and harm the profits of the CLSC, and the retailer is more vulnerable to low-quality RUP than the manufacturer; (2) the participation of GS can weaken the negative impact of low-quality RUP on the CLSC, while the participation of EW cannot; (3) the participation of GS or EW can increase the recycling rate of used products and revenues of the CLSC; (4) the linkage of the two can further enhance the economic and environmental value of EW and significantly improve the resource utilization efficiency and benefits of the CLSC.

The authors study the impact of GS, EW and the linkage between the two on resource utilization and revenue of the CLSC.