Is it possible for some parts to inhibit .ac interpolator?

[abassign]

I trying to use FreeCad to generate some parts (Gauges) for the FIAT G91R1B. I noticed a problem with the version of the guages made by Freecad.
When the instruments have flat faces, they observe shading effects due to the presence of many vectors on the edges. In CAD this is normal, so eliminating such edges is practically impossible unless using another mashing technique. Observing the same object with a render, such as Blender, does not see any shading.
My feeling is that this problem arises from the interpolation processor in the .ac file loader!
My question is this:
Is it possible for some parts to inhibit the interpolator?
The interpolator makes sense only for objects with a few vertices or parts of the fuselage, but in the case of our project this never happens because we have project level decided to work with a high number of vertices as we do the Interpolator work as pre-processing of the .ac file.

The image shows what we see, artifacts start at the edges and go to the central hole. If the surface is curved, there are no such problems, only to flat surfaces. In the development of this aircraft I have already noticed problems with the interpolator, such as an overly slow loading of objects when there are very close vertices, this is due to the algorithm used by the interpolator that is quadratic.


Here I show the vertices in the model, their number is not much higher than the version made with Blender, but if there are flat parts, the OBJ file produced by Freecad, it creates absolutely unnecessary vertices that make life difficult to ' interpolator. For this I would like to be able to inhibit it for some objects, it would be enough to have an option to insert into the .xml file that loads the .ac file

[Necolatis]

I have a bit of trouble understanding what you mean. Maybe a picture of how it should look would help.
Or an arrow in the picture showing where the issue is.

[Thorsten]

My feeling is that this problem arises from the interpolation processor in the .ac file loader!

If I understand the question right, your feeling is wrong, it's in the structure of the *.ac file - you need to set the option in the 3d modeling tool of your choice (and have the exporter to *.ac support it of course). In blender, you're looking for something like the edge split modifier - in FreeCad I don't know.

[V12]

This is common problem after export from CAD application to the other format. CAD doesn't use smoothing in export. You should try import model to the Blender and use Smooth function. It should be better.

[abassign]

This is common problem after export from CAD application to the other format. CAD doesn't use smoothing in export. You should try import model to the Blender and use Smooth function. It should be better.

I thank you for your answer, I will test with a flat object smouting to see if it is a good way to proceed.
Anyway, I'd like to understand if you can lock the interpolation program that should use the loader (so I was told in a previous post). In the case of objects rich in polygons, its use is superfluous and makes it much slower. I think this feature, if it does not exist, it would be very useful for those who make objects that have a high density of vertices.

[Thorsten]

Anyway, I'd like to understand if you can lock the interpolation program that should use the loader (so I was told in a previous post)

No, you can not 'lock the interpolation program' because the loader doesn't interpolate any surface normals, it's done in the rendering pipeline on the graphics card between vertex and fragment shader (but we don't want to change it there).

Please read through the answers given and try to understand them - you need to set an option in your 3d modeling tool and get the exporter to ac to honor that option (which may or may not be possible in your case) and then the surface arrives with the right atttributes in the rendering pipeline.

[Richard]

NOTE: I'm not sure if this is relevant or the reason for what you're seeing.

There is the SURF setting the .ac file that indicates surface smoothing.

SURF 0x10 - smoothed (one sided)
SURF 0x0 - flat (one sided)

Apart from this, and looking at the OSG .ac loader I cannot see anything else that manipulates the loaded geometry.