Here is a general conversion table showing how think3 entities are mapped to the IGES ones when converting a think3 3D model to the IGES format.
| think3 entity | IGES Entity to which it is converted | IGES entity number |
| Point | Point | 116 |
| Line | Line | 110 |
| Circular Arc | Circular Arc | 100 |
| Ellipse | Conic | 104 |
| Profile | Exploded into its component entities | - |
| NURBS curve | Rational B-Spline Curve | 126 |
| Offset curve | Offset curve | 130 |
| Plane | Plane | 108 |
| Circular Cylinder | Tabulated Cylinder | 122 |
| Tabulated Cylinder | Tabulated Cylinder | 122 |
| Ruled Surface | Ruled Surface | 118 |
| Surface of revolution | Surface of revolution | 120 |
| Coons Surface | Rational B-Spline Surface | 128 |
| Proportional Surface | Rational B-Spline Surface | 128 |
| Fillet Surface | Rational B-Spline Surface | 128 |
| Offset Surface | Offset Surface | 140 |
| NURBS surface | Rational B-Spline Surface | 128 |
| Solid | Manifold Solid B-Rep Object | 186 |
| Dimensions | NOT converted | - |
| Texts | NOT converted | - |
| Line Type | Line Font Pattern | - |
| Layers | Definition levels Property | 406 Form 1 |
| Line Width | Line Weight | - |
| Color | Color | - |