Read 8.1 display error

[shan-hai-logic]

Thank you very much for your work. I encounter display issues when reading a JT 8.1 file exported from the software NX. Specifically, when the decompression type is 3, and the data is decompressed using the code case 3: aData = new JtDecode_Int32CDP_Arithmetic(theReader);, errors occur in reading the position coordinates of polygon points, which in turn leads to incorrect model display. Could you please provide some suggestions for modification?

[shan-hai-logic]

SIG_HandGun8_1error.zip