User Forum of Software BASEMENT

carygrant

User

Registered: 2020-02-05

Posts: 7

material indices disregarded in xl mesh generation

I am trying to generate a mesh for BM3. But when using the XL Mesh generator with QGIS 3.14 and BASEmesh1.4.5, the resulting mesh does not contain the MATID codes, all values are 0. I also tried using QGIS 3.10, turning on and off snapping (-6 and -9) in TRIANGLE, moved the region points around inside the sones, and tried also using the old mesh generating procedure (non-XL), still no effect and same error. What else could I check, any hints on what can be wrong?

This is how part of the resulting 2dm looks like:

MESH2D   #created automatically via meshModel tool
NUM_MATERIALS_PER_ELEM 2
E3T       1   11680      74   12107       0 389.056
E3T       2   12107   11812   11680       0 389.056
E3T       3   11812      75   11680       0 389.012

...

ND   12575 462796.223942 6859623.942569 472.468911
ND   12576 463566.009598 6860024.116029 432.869854
ND   12577 462908.034366 6859798.743947 455.902972
NS 2 3 6464 4 -5 inflow
NS 79 10912 11208 78 8911 77 4561 4166 3588 6357 76 4165 3587 75 11680 -74 outflow
NS 3574 5223 5219 5212 5199 5171 5098 4548 12544 4107 12574 -62 cs_011
NS 3575 7037 7036 7035 7034 12081 -72 cs_021
NS 3574 5099 4108 -2369 cs_012
NS 2369 9784 7011 7726 8155 -3372 cs_013
NS 3372 8148 -1457 cs_014
NS 1457 8159 8157 8153 8151 4109 -95 cs_015
NS 3575 7033 -2579 cs_022
NS 2579 7514 7031 -3565 cs_023
NS 3565 -1581 cs_024
NS 1581 10915 4549 4110 12489 12558 -80 cs_025

Matteo Facchini

Developer

From: Trento

Registered: 2014-09-05

Posts: 281

Re: material indices disregarded in xl mesh generation

Hi,

sorry the dumb questions, but it might worth checking these things:

1. have you properly defined a MATID in your points layer (region definition)?
2. have you built the mesh with breaklines defining closed areas?
3. be sure to check that every breakline ends and begins on a node of another breakline/of the boudnary.

Best,
Matteo

carygrant

User

Registered: 2020-02-05

Posts: 7

Re: material indices disregarded in xl mesh generation

Thanks for the help. I'm still not sure what the reason was, but I re-edited all endpoints in a new map and they finally worked (but I couldn't see any leak points). I was suspecting that if I use a different projection for the map itself than what the individual layers are saved in, it might lead to some trouble...
Thanks for the help anyway

Matteo Facchini

Developer

From: Trento

Registered: 2014-09-05

Posts: 281

Re: material indices disregarded in xl mesh generation

Hey, glad you solved your problem.
Sure, all layers must have the same projection of the QGIS project!
Cheers