.inl files created with tetgen crash SoftDemo

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lucasw
Posts: 3
Joined: Fri Jul 09, 2010 9:09 pm

.inl files created with tetgen crash SoftDemo

Post by lucasw » Thu Aug 26, 2010 2:17 pm

I created a simple 3d object and exported it as an ascii stl file from meshlab, and then ran tetgen -p on it (version 1.4.1). Then I put the contents of .ele and .node into an inl file modeled after bunny.inl with quotes and \n line end characters around every line. But when I recompiled SoftDemo (bullet 2.77) to use my inl file I get a crash:

Code: Select all

*** glibc detected *** ./AppSoftBodyDemo: malloc(): memory corruption: 0x0830ac38 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0x34a591]
/lib/tls/i686/cmov/libc.so.6(+0x6e395)[0x34d395]
/lib/tls/i686/cmov/libc.so.6(__libc_malloc+0x5c)[0x34ef9c]
/usr/lib/nvidia-current/libGL.so.1(+0x33e80)[0x24de80]
======= Memory map: ========
00110000-00114000 r-xp 00000000 08:04 2541164    /usr/lib/libXxf86vm.so.1.0.0
00114000-00115000 r--p 00003000 08:04 2541164    /usr/lib/libXxf86vm.so.1.0.0
00115000-00116000 rw-p 00004000 08:04 2541164    /usr/lib/libXxf86vm.so.1.0.0
00116000-00122000 r-xp 00000000 08:04 2541132    /usr/lib/libXi.so.6.1.0
00122000-00123000 r--p 0000c000 08:04 2541132    /usr/lib/libXi.so.6.1.0
...
This is on ubuntu 10.04. Do I need different flags with tetgen, have to do something different in the inl, or is my source 3d file wrong?

I also tried passing the tetgen smesh output through tetgen again with the -YY flags, but got the same crash.

test.inl:

Code: Select all

static const char* getNodes() { return(
"28  3  0  0\n"
"   1    1  -1  -1\n"
"   2    1  -1  1\n"
"   3    1  1  -1\n"
"   4    0.199656  -0.199656  2.2071109999999998\n"
"   5    -0.199656  0.199656  2.2071109999999998\n"
"   6    -1  -1  -1\n"
"   7    -1  1  1\n"
"   8    -1  1  -1\n"
"   9    1  1  1\n"
"  10    0.56399999999999995  0.56399999999999995  1.9119999999999999\n"
"  11    -1  -1  1\n"
"  12    -0.56399999999999995  -0.56399999999999995  1.9119999999999999\n"
"  13    -0.199656  -0.199656  2.2071109999999998\n"
"  14    0.199656  0.199656  2.2071109999999998\n"
"  15    0.56399999999999995  -0.56399999999999995  1.9119999999999999\n"
"  16    -0.56399999999999995  0.56399999999999995  1.9119999999999999\n"
"  17    0.00072999999999999996  -1  -1\n"
"  18    -1  -1  -0.00071599999999999995\n"
"  19    1  -0.00034499999999999998  1\n"
"  20    1  -1  0.00047399999999999997\n"
"  21    -0.199656  -0.00014540000000000001  2.2071109999999998\n"
"  22    5.2200000000000002e-05  -0.199656  2.2071109999999998\n"
"  23    -1  1  0.00081300000000000003\n"
"  24    0.000165  1  1\n"
"  25    -0.00099799999999999997  -1  1\n"
"  26    -1  0.00077899999999999996  1\n"
"  27    0.56399999999999995  -0.00055489999999999999  1.9119999999999999\n"
"  28    0.00031530000000000002  0.56399999999999995  1.9119999999999999\n"
"# Generated by tetgen -YY test.1.smesh \n"); }

static const char* getElements() { return(
"48  4  0\n"
"    1      26    28    16    12\n"
"    2      28    21    16    12\n"
"    3      25    19     2    20\n"
"    4      28    27    10    14\n"
"    5      17     3    20     1\n"
"    6      20    24    18    19\n"
"    7      28    25    26    27\n"
"    8      21    27    28    22\n"
"    9      28    10    27    19\n"
"   10      21    27    22    12\n"
"   11      27    25    26    19\n"
"   12      24    17    18    23\n"
"   13      21    27    12    28\n"
"   14      21    14    28     5\n"
"   15      21    12    22    13\n"
"   16      23     3    17     8\n"
"   17      10    24     9    19\n"
"   18       9    19    24     3\n"
"   19      21    22    28    14\n"
"   20      27    26    28    19\n"
"   21      14    27    22    28\n"
"   22      19    17     3    20\n"
"   23      17    24     3    23\n"
"   24      22    15    12    27\n"
"   25      27    14    22     4\n"
"   26      19     2    15    25\n"
"   27      27    25    15    12\n"
"   28      16    24    26     7\n"
"   29      16    24    28    26\n"
"   30      26     7    24    23\n"
"   31      18    17     8    23\n"
"   32      22    27     4    15\n"
"   33      28    25    27    12\n"
"   34      28    24    10    19\n"
"   35      20    24    19    17\n"
"   36      18    19    25    20\n"
"   37      28    25    12    26\n"
"   38       6    18    17     8\n"
"   39      25    26    11    12\n"
"   40      28    21     5    16\n"
"   41      19    18    25    26\n"
"   42      24    19    28    26\n"
"   43      27    25    19    15\n"
"   44      20    24    17    18\n"
"   45      26    25    11    18\n"
"   46      18    24    26    19\n"
"   47      18    24    23    26\n"
"   48      17    24    19     3\n"
"# Generated by tetgen -YY test.1.smesh \n"); }

test.1.smesh:

Code: Select all

# test.1.smesh.  TetGen's input file.

# part 1: node list.
0  3  0  0  # nodes are found in test.1.node.

# part 2: facet list.
52  0
3      18    20    25
3      17    20    18
3       1     3    20
3       3     9    19
3       6     8    17
3      17     8     3
3      21    22    14
3      14     5    21
3       3    23    24
3      23     3     8
3      11    26    18
3      18    23     8
3      25     2    15
3      15    12    25
3      19    10    27
3      19     9    10
3      24    16    28
3      24     7    16
3      26    11    12
3      12    16    26
3      12    15    22
3      22    13    12
3      27    14     4
3      27    10    14
3      28     5    14
3      28    16     5
3      16    12    21
3      21     5    16
3       1    17     3
3      17     1    20
3      18     6    17
3       6    18     8
3      15     2    19
3       3    19    20
3      19     2    20
3       2    25    20
3      12    13    21
3      21    13    22
3      22     4    14
3      15     4    22
3      18    26    23
3      24    23     7
3       3    24     9
3      10     9    24
3      11    18    25
3      12    11    25
3      23    26     7
3      16     7    26
3      19    27    15
3       4    15    27
3      24    28    10
3      14    10    28

# part 3: hole list.
0

# part 4: region list.
0
# Generated by tetgen -p test.stl 
test.stl

Code: Select all

solid vcg
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    outer loop
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    endloop
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endsolid vcg

lucasw
Posts: 3
Joined: Fri Jul 09, 2010 9:09 pm

Re: .inl files created with tetgen crash SoftDemo

Post by lucasw » Mon Sep 06, 2010 4:53 pm

I should have seen it earlier, tetgen is producing one-based indices by default. The -z flag will make them zero based and SoftDemo won't crash.

sr_dready
Posts: 4
Joined: Fri Jun 11, 2010 2:12 pm

Re: .inl files created with tetgen crash SoftDemo

Post by sr_dready » Wed Oct 13, 2010 4:47 pm

Hi,
now I'm working with soft bodies. How do you create your .inl files? Manualy?
I know this isn't a reply for your answer, but you already found your solution. I hope you can say by topics the way you create your inl files.
Regards. :wink:

lucasw
Posts: 3
Joined: Fri Jul 09, 2010 9:09 pm

Re: .inl files created with tetgen crash SoftDemo

Post by lucasw » Wed Oct 13, 2010 6:18 pm

I took the .ele and .node files and put them together, added quotes around lines with search-and-replace text editor functions (I was using vim, a regular editor may make it more difficult) and the function code around them to make it match bunny.inl.

There are some more details here: http://binarymillenium.com/2010/08/firs ... ysics.html

It probably wouldn't be hard to write a python script to automate it, but I've gotten sidetracked from using bullet in custom software to learning how to use it in Blender.

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