TELEMAC-MASCARET Forum: t3s ascii mesh file decimal places in BK 3.12.16-alpha (1/2)

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TOPIC: t3s ascii mesh file decimal places in BK 3.12.16-alpha

BK 3.12.16 - alpha 5 months 3 weeks ago #44824

konsonaut
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openTELEMAC Guru
Posts: 413
Thank you received: 144

Hi Alan,

Really great work!

Recently I run into the following issue:
in the t3s ascii mesh file the first two node columns (x and y) have always 6 decimal places. It seems that the third column allows for max. 7 digits only.
This means when we create a mesh for a domain which e.g. is situated above 1000 masl, there are only 2 decimal places left in the representation of the bottom. Hence, the user has to shift the domain to a lower altitude in order to model the bottom accurately.

Please, may I request to allow for 8 digits in the third column in order to have a millimeter accuracy in such cases? In my view this seems enough unless a user has a domain which is located higher than the Mt Everest.

Best regards,
Clemens

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BK 3.12.16 - alpha 5 months 3 weeks ago #44832

a.barton OFFLINE Moderator Posts: 683 Thank you received: 178	Moving off of BK 3.12.16 - alpha post Thank you Could you let me know the steps to reproduce? I just saved a binary t3s as a single frame ASCII t3s using BK 3.12.16-alpha and there are 15 places after the decimal... maybe you are doing something different than what I just tried... Kindly... Alan
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BK 3.12.16 - alpha 5 months 3 weeks ago #44834

konsonaut OFFLINE openTELEMAC Guru Posts: 413 Thank you received: 144	Hi Alan, I'm using BlueKenue version 3.3.4. Enclosed an outline with 4 points: two points with z=1500.005, two points with z=1500.000 1) Create Triangulation with the outline 2) Save the triangulation as ASCII t3s file 3) Re-open the t3s file in BlueKenue or with a Text Editor -> z=1500.005 is rounded to 1500.01 Best regards, Clemens
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BK 3.12.16 - alpha 5 months 3 weeks ago #44835

konsonaut OFFLINE openTELEMAC Guru Posts: 413 Thank you received: 144	Enclosed the file. Please, rename the extension to i3s Attachments: outline.txt (1KB)
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BK 3.12.16 - alpha 5 months 3 weeks ago #44837

a.barton OFFLINE Moderator Posts: 683 Thank you received: 178	I'll start at the beginning and improve .i2s, .i3s and *.pcl ASCII file outputs so that they are all the same... thanks for letting me know about this Kindly... Alan
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BK 3.12.16 - alpha 5 months 3 weeks ago #44838

a.barton
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Moderator
Posts: 683
Thank you received: 178

Actually, out of curiosity, I tried creating a triangulation and writing it to a file using BK 3.12.16-alpha. I get the following which seems ok:

############################################################################
:FileType t3s  ASCII  EnSim 1.0
# File structure National Research Council Canada © 1998-2024
############################################################################
# DataType    2D T3 Scalar Mesh
#
:Application  BlueKenue
:Version      3.12.16
:WrittenBy    Bartona  # potential owner of the data
:CreationTime 2024/05/28 13:33:41.000
#---------------------------------------------------------------------------
#
:NoDataValue -999
:AttributeCount 1
:AttributeName 1 Value
:AttributeType 1 double 
:AttributeCapacityHint 1 5
#
:CurrentAttribute 1 # AJB: experimental
#
#
:SourceFile   
:NodeCount 5
:ElementCount 3
:ElementType  T3
#
:EndHeader
19.053000000000633 34.104999999999997 1500.005000000000100
28.842000000000322 52.526000000000003 1500.005000000000100
28.842000000000414 52.526000000000003 1500.005000000000100
38.316000000000479 27.789000000000001 1500.000000000000000
47.368000000000904 48.631999999999998 1500.000000000000000
1 4 3
1 3 2
3 4 5

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BK 3.12.16 - alpha 5 months 3 weeks ago #44852

a.barton OFFLINE Moderator Posts: 683 Thank you received: 178	I take back my comment: "I get the following which seems ok" and replace it with: There is an extra point! I will get rid of it... stay tuned... Alan
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BK 3.12.16 - alpha 5 months 3 weeks ago #44853

a.barton
OFFLINE
Moderator
Posts: 683
Thank you received: 178

Yes... definitely a bug. Now fixed.

Here's what the triangulation looks like now:

############################################################################
:FileType t3s  ASCII  EnSim 1.0
# File structure National Research Council Canada © 1998-2024
############################################################################
# DataType    2D T3 Scalar Mesh
#
:Application  BlueKenue
:Version      3.12.17
:WrittenBy    Bartona  # potential owner of the data
:CreationTime 2024/05/30 09:49:49.000
#---------------------------------------------------------------------------
#
:NoDataValue -999
:AttributeCount 1
:AttributeName 1 Value
:AttributeType 1 double 
:AttributeCapacityHint 1 4
#
:CurrentAttribute 1 # AJB: experimental
#
#
:NodeCount 4
:ElementCount 2
:ElementType  T3
#
:EndHeader
19.053000000000718 34.104999999999997 1500.005000000000100
28.842000000000237 52.526000000000003 1500.005000000000100
38.316000000000166 27.789000000000001 1500.000000000000000
47.368000000000542 48.631999999999998 1500.000000000000000
1 3 2
2 3 4

I'll try to build and share a new alpha today; with this and a couple of few other fixes too...

Kindly... Alan

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BK 3.12.16 - alpha 5 months 3 weeks ago #44855

a.barton OFFLINE Moderator Posts: 683 Thank you received: 178	BK 3.12.17 - alpha is now available with this fix
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BK 3.12.16 - alpha 5 months 3 weeks ago #44840

a.barton OFFLINE Moderator Posts: 683 Thank you received: 178	And, as per Mesh Resolution Post, the precision will be within 9.99e-13 of the original input point used for the triangulation. Kindly... Alan
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