The format data are stored in a file as text data. Q may be a composition of matrices for the following elementary transformations:. The line data consist of a 3D point P and a 3D direction D. The line passes through the point P , has the direction D and is defined by the following parametric equation:. The circle has a center P and is located in a plane with a normal N. The circle has a radius r and is defined by the following parametric equation:.
The parabola is located in plane which passes through the point P and has the normal N. The parabola has a focus length f and is defined by the following parametric equation:. The hyperbola is located in plane which passes through the point P and has the normal N. The hyperbola is defined by the following parametric equation:. The Bezier curve is defined by the following parametric equation:. The B-spline curve is defined by the following parametric equation:.
The trimmed curve is defined by the following parametric equation:. The offset curve is defined by the following parametric equation:. The plane passes through the point P , has the normal N and is defined by the following parametric equation:.
Two faces are adjacent if they share a common edge. Topology alone does not tell you the size, curvature, or 3D locations of any of those pieces. However, each piece of topology does knows about it's underlying geometry. A face knows what surface it lies on. An edge knows what curve it lies on.
The geometry knows about curvature and location in space. Thus, Topology defines the relationship between simple geometric entities, which can be linked together to represent complex shapes. Note: Only 3 types of topological objects have geometric representations — vertex, edge, and face Source. The geometric types actually can be divided into two major groups: curves and surfaces. Out of the curves line, circle, For example, the geometric primitive line is unlimited, i.
And a box -- a solid -- can be created by six limited planes. Thus, out of shapes you can build very complex parts or, the other way round, extract all sub-shapes a more complex shape is made of. The Part::TopoShape class is the geometrical object that is seen on screen. Product Feature Set. Common CAD viewer feature set:. Viewing and navigation. Supported file formats. Contact Open Cascade to get more information.
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