The Catia IGES translator is based on IBM IGES Format (IIF). When you save a Catia model as an IGES file, it undergoes two translations: Catia=>IIF=>IGES. The IIF=>IGES step is done by the igesp program. This program has two parameters which affect the accuracy of the model and therefore increase the potential that SolidWorks will be able to form a solid out of the data. You can modify these values by editing the file igesinp.data. The 2 parameters which should be changed are:
SIGFIG COEF n SIGFIG CORD n where n is the number of significant digits. The default values are 8 and 6 respectively. The range of values are from 5 to 14. The recommended values are 14 and 14.
COEF indicates the maximum number of significant digits in the IGES file for a real number that is a coefficient of an equation. CORD indicates the maximum number of significant digits in the IGES file for a real number that is a coordinate. By using the maximum values for these parameters, the size of the IGES file can become large, but the potential that SolidWorks will be able to form a solid out of the data is much greater.