CAD surface quality

    Automatically and manually optimizing the quality of CAD surface models

    CAD surface quality results from the algorithmic properties of the CAD systems used, from the design history and from conversion processes via interfaces. CAD data with qualitative deficiencies often has to be imported and further processed in order to manufacture molds and dies. In addition to curvature, the most important evaluation criteria for CAD free-form surfaces include gaps and overlaps between the individual surfaces, polynomial degree and the number of surface segments as well as the layout of the surfaces in the overall topology. CAD surface quality can be improved in Tebis with little time and effort, which allows for better processing of the CAD data in design and manufacturing and its transfer to other CAD systems. This is realized with both automatic and manual optimization of the surfaces and results in quality up to class A.

    Greater convenience and subsequent design activities
    Better manufactured services with shorter machine run times
    Simple data transfer to other CAD systems

    Analysis functions

    Detection of qualitative weaknesses

    The quality analysis shows the location of problem areas in the part at a glance. This allows examination of curves, surfaces and composite surfaces (topologies).

    In these examples, the quality analysis shows where there are gaps that are too large and kinks between the surfaces.

    Repair at the click of a button

    Easy repairing of the majority of problem areas in surface models

    Automatic surface optimization in Tebis reduces the number of surface patches completely automatically. It also detects gaps and overlaps between individual surfaces and corrects these completely automatically to form a watertight surface model. It detects areas with high risk points in the surface layout, including kinks, trimmed surfaces with excessively large base surfaces, micro-segmented curves and surfaces. These CAD models can lead to problems later in the design and manufacturing processes. Tebis also corrects these areas in CAD surfaces automatically, which improves CAD surface quality. The result can be seen in a preview before actual execution.

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    Tebis detects surfaces with unnecessarily high segmentation and corrects these fully automatically without changing the geometry. Surface models with reduced surface patches can be more easily handled during later CAD/CAM processing.
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    Tebis detects all impermissibly large gaps between the individual surfaces and closes them completely automatically with a specifiable tolerance.
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    Tebis detects surfaces with problematic areas like kinks, microsegments in curves, mini surfaces and faces with excessively large base surfaces and repairs these areas automatically.

    Improving surface layout

    Manually improving layout structures of surface models

    Tebis has functions for surface design pros for handling base surfaces and N-corner surfaces, removing triangle surfaces, creating logical surface structures and much more.

    Recognize unnatural areas at the click of a button
    Reduce areas that are too large at the click of a button
    Replace the fissured surface layout with an approximation surface at the click of a button
    Combine several square surfaces in a single square surface with the click of a button

    Class-A quality

    Bringing surface models to Class-A level

    Experienced surface designers can use the functions for converting curves and base surfaces to Class A in order to quickly create surfaces with reflections in harmony with all adjacent surfaces. The optimized surfaces always remain within the range of an adjustable distance tolerance from the original surfaces. The optimization of the surface models works independent of the origin of the surface data.

    Adjustment of surface properties in parameters with visual feedback
    For large base surfaces, the designer uses parameters to adjust the curvature transitions between the surface segments of the large carrier surface and receives visual feedback in the form of colors indicating how far the optimized surface deviates from the original.
    Curvature analyses for evaluating the generated surfaces
    Designers are supported by analysis functions like zebra shading, curvature combs and control polygons. They can detect undesirable surface kinks and wavy surfaces due to incorrectly selected surface parameters, including excessive segmentation and unsuitable polynomial degrees.

    Additional links

    Using reverse engineering to align the CAD world with the real world

    Reverse engineering is used everywhere that work is performed manually on real objects and in the CAD model. In model manufacturing, design objects and vehicles modeled in clay are scanned and transferred to CAD surfaces. In die manufacturing, manual changes to sheet-metal dies in the tryout phase are scanned and the existing CAD model is updated based on the scanned data.


    For a model of medium complexity, developing high-quality CAD design surfaces for the outer skin of a vehicle now takes roughly 50 hours. (Previously, it took about twice the time.)

    BWM Group-Design