Problem with Station Lines

[Schuchardt]

Hello,

I encountered some strange behaviour in drawing station lines, that I could reproduce with the following simple procedure.

Starting from the default model, I have shifted the keel line a little bit outwards and then added a keel as separate part, completely independent from the hull. In this constellation, the station lines are curiously distorted near the keel, as can be seen from the attached figure ‘model1’ in the body and the perspective view. The same is shown again in ‘model2’in the body view. If the intersection lines of the keel part are suppressed, the station lines of the hull are correctly exposed (see ‘model3’).

The observed distortion completely disappears, when the keel is moved by some distance away from the hull.

Any suggestions? Is this a known error?

The corresponding fbm-file is attached, too.

Regards
Klaus

Attachments:

• model1_2011-10-11.PNG
• model2_2011-10-11.PNG
• model3_2011-10-11-2.PNG
• model_2011-10-11.fbm

[Marven]

The program tries to merge smaller line segments into one station. In your case the keel intersection is added to the hull intersection.
Try merging the keel and hull into one surface without the keel penetrating the hull surface.

[Schuchardt]

Hi marven,

thank you for your comment, but I am not convinced.

I have reduced the hull to a small segment and have merged all unneeded internal edges in order to demonstrate clearly what happens. In the attachments you can find the results of the original ‘two-part-model’ (test1) and of the ‘one-surface-model’ (test2) that you have suggested. The disturbance is still there. The entire construction is very clear, very simple and very wrong in both cases.

The corresponding fbm-files are also attached.

Regards
Klaus

Attachments:

• test1.PNG
• test2.PNG
• test1.fbm
• test2.fbm

[Schuchardt]

Here is a small amendment. The effect is still present after a large move of the lower surface of the keel (test3a), but it disappears after a relatively smaller movement of the upper surface (test3b).

Attachments:

• test3a.PNG
• test3b.PNG

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