Diehl, Rabanus2015-10-052015-10-0519881017-4656https://doi.org/10.2312/egtp.19881010Methods for the conversion from boundary-representations to approximation models (especially the bintree model) are examined. A new algorithm for the conversion to the bintree model is presented. It employs an inheritence mechanism during the subdivision, and reduces the block classification of leaf nodes by taking over the colours of the block corners calculated in advance.10.2312/egtp.19881010