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KA_146204473-Newcomer
3-Newcomer
September 23, 2026
Question

STEP Import: Surface Entity/Geometry Is Not Properly Reflected in Creo Parametric

  • September 23, 2026
  • 1 reply
  • 31 views

I am facing an issue while importing a STEP file into Creo Parametric.

The attached STEP file contains six geometry entities named "Surface". In the STEP file, these are represented as MANIFOLD_SOLID_BREP entities, each containing a single planar ADVANCED_FACE.

The surface geometry appears correctly in the source application, but after importing the STEP file into Creo, these surfaces are not represented as expected.

Could someone clarify how Creo interprets this type of MANIFOLD_SOLID_BREP representation during STEP import, and whether this is expected behavior or if a different STEP surface representation is required?
 

I have attached:

  • The original STEP file.
  • Screenshot of the expected representation.
  • Screenshot of the resulting geometry in Creo after STEP import.

1 reply

tbraxton
tbraxton22-Sapphire II
22-Sapphire II
September 23, 2026

The “terrain” assembly model is not solidifying on import. This is because you do not have a watertight quilt geometry that would enable a solid to be created when the STEP file is read into Creo. Start by isolating the “terrain” model only in the source program and check that is in fact a solid body and that it exports as a solid body from the source. 

In Creo the errors are solidification errors cause by the fact that you have open quilts. You need to have a watertight quilt in order to solidify the geometry. The structure of the model is an assembly when the STEP file comes into Creo and none of the parts in the assembly are solidified due to the geometry. It looks like the STEP export from the source is problematic in this context. If you want a solid base in Creo to represent the terrain, then you need to export 1 solid body as a part or multiple solid bodies as an assembly from the source.

You can see that the structure of this when imported to Creo is a collection of surface parts (no closed quilts so will not solidify) and some curves representing the contour lines of the terrain which are not going to solidify. Note that these curves are assembly curves and not in any of the parts of the assembly.

Imported STEP data is not consistent with solid geometry creation

 

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