CAD surface quality

Automatically and manually optimize 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 assembly. Tebis improves CAD surface quality with little 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 can result in quality up to class A.

Analysis functions provide information

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

In this example, the quality analysis shows where there are too large gaps and kinks between the surfaces.

Many of the problems in surface models can be repaired with the click of a button

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 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.

Tebis detects all impermissibly large gaps between the individual surfaces and closes them automatically with a specifiable tolerance. 

Tebis detects surfaces with unnecessarily high segmentation and corrects these automatically without changing the geometry. Surface models with reduced surface patches can be easily handled during later CAD/CAM processing.

Tebis detects surfaces with problematic areas like kinks, micro segments in curves, mini surfaces and faces with excessively large base surfaces and repairs these areas automatically. 

Quickly accomplished: Manually improving layout structures on 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 too large areas 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 into a single square surface at the click of a button

Bringing surface models to Class-A level

Seasoned 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.

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.

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.

Your benefits from optimized CAD surfaces:

  • Better surfaces manufactured in a shorter run time
  • Easier design work in Tebis
  • Simple data transfer to other CAD systems
  • Reduced effort

Additional links


Cooperation with BMW Group-Design
For high-quality CAD design surfaces of a vehicle outer skin, a model of medium complexity takes about 50 hours to calculate.
(one project result)

Read here how this works and more about all cooperation projects with BMW Group-Design.


Are you interested in CAD surface quality, and would you like us to contact you? Please click here 


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