zanoni-mbdyn / blendyn Goto Github PK

When plotting NetCDF variables, if a request is made to plot variables that differ only for lowercase/uppercase, e.g.

dd0.elem.joint.11.D
dd0.elem.joint.11.d

an exception is raised:

Traceback (most recent call last):
  File "/usr/lib64/python3.5/urllib/request.py", line 1410, in open_local_file
    stats = os.stat(localfile)
FileNotFoundError: [Errno 2] No such file or directory: '/home/zanoni/lavoro/mbdyn/mbdyn-src/tests/joints/deformablehinge/test/plots/dd0.elem.joint.11.D.svg'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/zanoni/.config/blender/2.78/scripts/addons/blendyn-master/plotlib.py", line 517, in execute
    cairosvg.svg2png(url = outfname + ".svg", write_to = outfname + ".png")
  File "/usr/lib64/python3.5/site-packages/cairosvg/__init__.py", line 45, in <lambda>
    surface_type.convert(*args, **kwargs))(_surface_type)
  File "/usr/lib64/python3.5/site-packages/cairosvg/surface.py", line 135, in convert
    tree = Tree(**kwargs)
  File "/usr/lib64/python3.5/site-packages/cairosvg/parser.py", line 385, in __init__
    parse_url(self.url), 'image/svg+xml')
  File "/usr/lib64/python3.5/site-packages/cairosvg/parser.py", line 258, in fetch_url
    return read_url(url, self.url_fetcher, resource_type)
  File "/usr/lib64/python3.5/site-packages/cairosvg/url.py", line 96, in read_url
    return url_fetcher(url, resource_type)
  File "/usr/lib64/python3.5/site-packages/cairosvg/url.py", line 42, in fetch
    return urlopen(Request(url, headers=HTTP_HEADERS)).read()
  File "/usr/lib64/python3.5/urllib/request.py", line 163, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib64/python3.5/urllib/request.py", line 466, in open
    response = self._open(req, data)
  File "/usr/lib64/python3.5/urllib/request.py", line 484, in _open
    '_open', req)
  File "/usr/lib64/python3.5/urllib/request.py", line 444, in _call_chain
    result = func(*args)
  File "/usr/lib64/python3.5/urllib/request.py", line 1388, in file_open
    return self.open_local_file(req)
  File "/usr/lib64/python3.5/urllib/request.py", line 1428, in open_local_file
    raise URLError(exp)
urllib.error.URLError: <urlopen error [Errno 2] No such file or directory: '/home/zanoni/lavoro/mbdyn/mbdyn-src/tests/joints/deformablehinge/test/plots/dd0.elem.joint.11.D.svg'>

location: <unknown location>:-1

location: <unknown location>:-1

and the resulting files in the plots/ directory are

dd0.elem.joint.11.d.png
dd0.elem.joint.11.d.svg
dd0.elem.joint.11.d (Conflitto di maiuscole o minuscole (1)).png
dd0.elem.joint.11.d (Conflitto di maiuscole o minuscole (1)).svg

My guess here is that Pygal is the culprit, but I haven't had the time to investigate thoroughly...

Blender standard way of displaying a message to the user is to print it in the topbar, something that is accomplished with the report method of operators. However, the report messages are easy to miss: therefore it would be better to store them in a log file in the Text Editor, that gets updated during the current session.

An error popped up when I tried to run simulation after selecting input file.

Python: Traceback (most recent call last):
  File "C:\Users\Xiang\AppData\Roaming\Blender Foundation\Blender\3.1\scripts\addons\blendyn-master\blendyn.py", line 1328, in invoke
    return self.execute(context)
  File "C:\Users\Xiang\AppData\Roaming\Blender Foundation\Blender\3.1\scripts\addons\blendyn-master\blendyn.py", line 1255, in execute
    self.timer = context.window_manager.event_timer_add(0.5, context.window)
TypeError: WindowManager.event_timer_add(): required parameter "window" to be a keyword argument!

location: <unknown location>:-1

Conditions to reproduce:
Ubuntu 20.04.4
MBDyn 1.7.3
Current version of Blendyn
Blender 3.1.2
Python 3.10.4
All dependencies of MBDyn, Blender and Blendyn installed

Steps to reproduce:
1.Save an example as txt file.
2.Select the file as input file.
3.click Run Simulation.

 Hi,when I using Blender2.79 and Mbdyn1.7.3 to learn Wiki on Helicopter blade flapping analysis,I found that something differences:in Scene Property panel the node_10 and 11 is lost;And I can't find the 3-no:qde beam element under the elements list,as well as Data Properties panel.
  I don't know what's the problem ,How can I get the right way?Any idea or help would be great :)

Best wishes,
goodluckko

Hi,
I am trying to install the add-on on blender. Things go smothly until I check the box to enable the add-on. At that moment, blender closes. If I open blender from termina, this is what I have:

myuser@mycomputer:~$ blender
Read prefs: /home/ion/.config/blender/2.82/config/userpref.blend
Warning: property 'release_confirm' not found in keymap item 'OperatorProperties'
reloading addon: blendyn-master 1589898681.8350818 1589899370.8320978 '/home/ion/.config/blender/2.82/scripts/addons/blendyn-master/__init__.py'
Modules Installed () from '/home/ion/Downloads/blendyn-master.zip' into '/home/ion/.config/blender/2.82/scripts/addons'
WARN (rna.define): /build/blender-RL3axj/blender-2.82.a+dfsg/source/blender/makesrna/intern/rna_define.c:1647 RNA_def_property_ui_text: 'Collector of rotational offsets of element attach R.Fs.' description from 'rotoffsets' '' ends with a '.' !
WARN (rna.define): /build/blender-RL3axj/blender-2.82.a+dfsg/source/blender/makesrna/intern/rna_define.c:1239 RNA_def_struct_ui_text: ' Plots the selected variable in the image editor
        and optionally save it as .svg in the 'plots' directory.
        The user can choose among all the variables of all the
        MBDyn entitites found in the output NetCDF fila.' description from 'BLENDYN_OT_plot_var_scene' '' ends with a '.' !
blender(BLI_system_backtrace+0x37) [0x562a9bdfa897]
blender(BLI_ghash_insert+0xe2) [0x562a9bd997e2]
blender(+0x18ef87b) [0x562a99c0987b]
blender(+0x1913a0f) [0x562a99c2da0f]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(+0x258be2) [0x7f12141ccbe2]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(+0x72ffd) [0x7f1213fe6ffd]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x3c6b) [0x7f1213feb06b]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalCodeWithName+0x8fb) [0x7f121413988b]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyFunction_Vectorcall+0x90) [0x7f1214214cd0]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(+0x72ffd) [0x7f1213fe6ffd]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x8067) [0x7f1213fef467]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalCodeWithName+0x8fb) [0x7f121413988b]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyFunction_Vectorcall+0x90) [0x7f1214214cd0]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(+0x72ffd) [0x7f1213fe6ffd]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalFrameDefault+0x4ea2) [0x7f1213fec2a2]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyEval_EvalCodeWithName+0x8fb) [0x7f121413988b]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(_PyFunction_Vectorcall+0x90) [0x7f1214214cd0]
/usr/lib/x86_64-linux-gnu/libpython3.8.so.1.0(PyVectorcall_Call+0x5c) [0x7f12142153cc]
blender(+0x19116bf) [0x562a99c2b6bf]
blender(+0x18ed199) [0x562a99c07199]
blender(+0x15d1a78) [0x562a998eba78]
blender(+0x15d20fb) [0x562a998ec0fb]
blender(WM_operator_name_call_ptr+0x4a) [0x562a998ec5ca]
blender(+0x1b954b6) [0x562a99eaf4b6]
blender(+0x1ba672d) [0x562a99ec072d]
blender(+0x15d549f) [0x562a998ef49f]
blender(+0x15d73ec) [0x562a998f13ec]
blender(wm_event_do_handlers+0x50d) [0x562a998f1c6d]
blender(WM_main+0x20) [0x562a998e7160]
blender(main+0x2b6) [0x562a996ba3d6]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f1211d4f0b3]
blender(_start+0x2e) [0x562a997088ae]
BLI_assert failed: /build/blender-RL3axj/blender-2.82.a+dfsg/source/blender/blenlib/intern/BLI_ghash.c:464, ghash_insert_ex(), at '(gh->flag & GHASH_FLAG_ALLOW_DUPES) || (BLI_ghash_haskey(gh, key) == 0)'
Aborted (core dumped)

Of course, previous to installing the add-on I installed mbdyn and all its dependencies as explained at the wiki.

I will appreciate any help. Thanks for doing a so great job.

Regards,

Ion

Hello everyone,

executing the following code below, I am wondering, why the rotation icon (in red) is not centered to the actual rotation center, but offset by the blue line.
The real rotation center in the animation is between the two nodes.

# double_rotation.mbd

begin: data;
   problem: initial value;
end: data;

begin: initial value;
   initial time:   0.;
   final time:     5.;
   time step:      1.e-3;
   max iterations: 10;
   tolerance:      1.e-6;
end: initial value;

begin: control data;
   structural nodes: 3;
   rigid bodies:     2;
   joints:           3;
   forces:			 1;
default orientation: orientation vector;
end: control data;

# Design Variables
set: real M = 1.; # Mass of Link1 and Link2
set: real L = 1.; # Length of Link1 and Link2

set: real theta1 = pi/6.; # Initial angle of Link1 w.r.t vertical line
set: real theta2 = pi/6.; # Initial angle of Link2 w.r.t Link1

# Reference Labels
set: integer Ref_Ground = 1;
set: integer Ref_Link1 = 2;
set: integer Ref_Link2 = 3;

# Node Labels
set: integer Node_Ground = 1;
set: integer Node_Link1 = 2;
set: integer Node_Link2 = 3;

# Body Labels
set: integer Body_Link1 = 1;
set: integer Body_Link2 = 2;

# Joint Labels
set: integer JoClamp_Ground     = 1;
set: integer JoRevp_Link1       = 2;
set: integer JoRevh_Link1_Link2 = 3;

# Reference

reference: Ref_Ground,
   null,                        # absolute position
   eye, # absolute orientation
   null,                        # absolute velocity
   null;                        # absolute angular velocity

reference: Ref_Link1,
   reference, Ref_Ground, null,                        # absolute position
   reference, Ref_Ground, euler, 0., pi/2.-theta1, 0., # absolute orientation
   reference, Ref_Ground, null,                        # absolute velocity
   reference, Ref_Ground, null;                        # absolute angular velocity
   
reference: Ref_Link2,
   reference, Ref_Link1, L, 0., 0.,              # absolute position
   reference, Ref_Link1, euler, 0., -theta2, 0., # absolute orientation
   reference, Ref_Link1, null,                   # absolute velocity
   reference, Ref_Link1, null;                   # absolute angular velocity

begin: nodes;
   structural: Node_Ground, static,
      reference, Ref_Ground, null, # absolute position
      reference, Ref_Ground, eye,        # absolute orientation
      reference, Ref_Ground, null, # absolute position
      reference, Ref_Ground, null; # absolute position
   
   structural: Node_Link1, dynamic,
      reference, Ref_Link1, 1./2.*L, 0., 0., # absolute position
      reference, Ref_Link1, eye,             # absolute orientation
      reference, Ref_Link1, null,            # absolute velocity
      reference, Ref_Link1, null;            # absolute angular velocity
      
   structural: Node_Link2, dynamic,  
      reference, Ref_Link2, 1./2.*L, 0., 0., # absolute position
      reference, Ref_Link2, eye,             # absolute orientation
      reference, Ref_Link2, null,            # absolute velocity
      reference, Ref_Link2, null;            # absolute angular velocity
      
end: nodes;

begin: elements;

   #-----------------------------------------------------------------------------
   # Bodies
   body: Body_Link1, Node_Link1,
      M,                                # mass
      null,                             # relative center of mass
      diag, 0., M*L^2./12., M*L^2./12.; # inertia matrix
      
   body: Body_Link2, Node_Link2, 
      M,                                # mass
      null,                             # relative center of mass
      diag, 0., M*L^2./12., M*L^2./12.; # inertia matrix
   #-----------------------------------------------------------------------------
   # Joints  
   joint: JoClamp_Ground,
      clamp,
         Node_Ground,
            null, # absolute position
            eye;  # absolute orientation
                
   joint: JoRevp_Link1, 
      axial rotation, 
         Node_Ground,
            null,                     # relative offset
            hinge, reference, Ref_Link1, 1, 1., 0., 0., 3, 0., 1., 0., # relative orientation
         Node_Link1,
            reference, Ref_Link1, null,                                # relative offset
            hinge, reference, Ref_Link1, 1, 1., 0., 0., 3, 0., 1., 0., # relative axis orientation
         const, 2.*pi;    # angular velocity
            
   joint: JoRevh_Link1_Link2, 
      axial rotation, 
         Node_Link1,
            reference, Ref_Link2, 0,0,0,                                # relative offset
            hinge, reference, Ref_Link2, 1, 1., 0., 0., 3, 0., 1., 0., # relative axis orientation
         Node_Link2,
            reference, Ref_Link2, 0,0,0,                               # relative offset
            hinge, reference, Ref_Link2, 1, 1., 0., 0., 3, 0., 1., 0., # relative axis orientation
         const, 2.*pi;     # angular velocity
   
   force: 10, absolute, Node_Link2, position, 0., 1., 0., 0., 0., 0., const, 11.;
end: elements;

I get the error seen on the image below when hitting the "Animate scene" button.

Traceback (most recent call last):
  File "/home/rock/.config/blender/3.6/scripts/addons/blendyn-master/blendyn.py", line 1499, in invoke
    return self.execute(context)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/rock/.config/blender/3.6/scripts/addons/blendyn-master/blendyn.py", line 1488, in execute
    ret_val = set_motion_paths_mov(context)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/rock/.config/blender/3.6/scripts/addons/blendyn-master/baselib.py", line 1066, in set_motion_paths_mov
    rw_mov = np.array(next(reader_mov)).astype(np.float)
                                               ^^^^^^^^
  File "/usr/lib/python3/dist-packages/numpy/__init__.py", line 305, in __getattr__
    raise AttributeError(__former_attrs__[attr])
AttributeError: module 'numpy' has no attribute 'float'.
`np.float` was a deprecated alias for the builtin `float`. To avoid this error in existing code, use `float` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.float64` here.
The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at:
    https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations. Did you mean: 'cfloat'?
Error: Python: Traceback (most recent call last):
  File "/home/rock/.config/blender/3.6/scripts/addons/blendyn-master/blendyn.py", line 1499, in invoke
    return self.execute(context)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/rock/.config/blender/3.6/scripts/addons/blendyn-master/blendyn.py", line 1488, in execute
    ret_val = set_motion_paths_mov(context)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/rock/.config/blender/3.6/scripts/addons/blendyn-master/baselib.py", line 1066, in set_motion_paths_mov
    rw_mov = np.array(next(reader_mov)).astype(np.float)
                                               ^^^^^^^^
  File "/usr/lib/python3/dist-packages/numpy/__init__.py", line 305, in __getattr__
    raise AttributeError(__former_attrs__[attr])
AttributeError: module 'numpy' has no attribute 'float'.
`np.float` was a deprecated alias for the builtin `float`. To avoid this error in existing code, use `float` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.float64` here.
The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at:
    https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations. Did you mean: 'cfloat'?

-- System Information:
Debian 13
Blender 3.6.2
Python 3.11.6
NumPy 1.24.2
Blendyn: commit ee0853d

-- Edit:
Swapped error image with error text for (better?) readability.

This issue can count towards the entry exam for the Blendyn related projects for MBDyn-GSoC2017

This is more a feature request than an issue.

When importing the data into an already animated scene but using a newly created .nc or .mov file which ends before the previous import, the frames that come after the last timestep (may depend also on import frequency) of the new results will remain as they were before and this creates confusion by mixing results from two simulations. An ideal behavior would be that the nodes/elements frames that are present in the new results file get cleared before importing the new results.

Andrea may want to give his point of view on this one...

This issue can count towards the entry exam for the Blendyn related projects for MBDyn-GSoC2017

Although the Blendyn addon is fairly compact, in its current form, the repository is roughly 100mb.
This is due to the presence of the .pack file which keeps track of all historical changes in the repository.

Identify the files which could be removed from history and suggest a fix.

Hint: http://stackoverflow.com/questions/11050265/remove-large-pack-file-created-by-git#11277929

When I plot using Blendyn's embedded interface, I noticed that each Blender object has its own plotting frequency which defaults to 1. For example, if I choose one object, set the plot frequency, and then select another Blender object, the frequency resets itself to 1. Is assume this may not be the desired behavior...

the tutorial shows UI of Blender that is different than the UI of the newest version "2.82".
of course I installed the Blendyn addone and it is there but couldn't access the Blendyn features from the toolbar since it does not show up (which is already mentioned in the main page).

Usually it should show up in the animation toolbar, right? Even clicking 'N' doesn't bring it up!

here are screenshots to understand more what is going on.

The blendyn addone installed

The blendyn "features" show up but No 'Load Results'

When 'N' is pressed

What could be wrong? did I mess up the installation?

In the meantime, I will try to install Blender v2.7* from source and use the older version, but it should be a temporary solution.

When using textual output (.mov file), Blender objects with MBDyn nodes assigned are not moved at each timestep as one would expect, but "jump" to the simulation final position at frame 1.

The issue is probably located in the method set_motion_paths_mov(context) found at line 279 of file base.py, which in turn calls the method set_obj_locrot_mov(obj, rw) defined at line 48 of file nodelib.py.

The output of specific nodes can be disabled in MBDyn, for example using the

output, no

directive at the end of their definition in the input file.

Blendyn gathers the information about the nodes present in the model from the .log file, in which no information about their output is given. So it is possible that a node without any output is imported in the Blender scene, causing trouble when the animation is requested.

Blendyn should be able to recognise that the output of specific nodes has been disabled, and just warn the user without stopping the animation of the other nodes.

I am running Blender 3.4 on Windows 10, and I am having some trouble with Blendyn.

1. I tried installing the branch blendyn-master branch. However, it doesn't allow me to enable this add-on. I was wondering why.
2. Instead, I installed the blendyn-bugfix branch and I installed dependencies on netcdf4. However, when I import the input file the error in the next photo arises. Apparently it goes away when I click on the "load .log file" button (is it normal?).

Then, when I animate the node, everything appears to work but actually no animation is created (meaning in the timeline my animation is a point, so the node doesn't follow the motion it is supposed to follow). I also run the mbdyn file with Matlab and plotted the motion to check the .nc file is in order and I think it is, since I get good motion plots in Matlab. Therefore, I was wondering if maybe I am doing something wrong?

I upload also my input file in case it is needed.
rigidbody.txt

Thank you in advance,
Lidia

From a this issue, now closed:

Check, when re-loading the .log file, if a node or an element associated to some Blender object present in the scene has been removed from the MBDyn input file, and remove both the reference to the entity in the bpy.context.scene.mbdyn.{nodes,elems} dictionaries and the corresponding Blender object in the scene.

[...] it is probably better to tackle it when the user loads the .log file after having done so already. Off the top of my head, we could flag all the nodes/elements as "not imported" before re-reading the .log file (there is an is_imported Bool Property in the MBDynNodesDictionary and MBDynElemsDictionary collection properties), flag them as "imported" as we find them in the .log file, and then check which one are left as "not imported" at the end of the process, and get rid of them.

Hello,

I'm trying to use "MBDyn Standard Import" in order to add all elements to the scene, however I get an error and blendyn stops working as soon as I click on Import Button. In addition, when I'm going to add elements from the scene property panel, for example adding a spherical hinge (or many others), I get the same error and same situation of blendyn!
Btw, I'm using Blender2.76b and mbdyn-1.7.3. Also, here is the error that I get:

blender: /build/blender-40PcOX/blender-2.76.b+dfsg0/source/blender/blenlib/intern/math_rotation.c:1328: get_rotation_order_info: Assertion `order >= 0 && order <= 6' failed.
Aborted (core dumped)

Any idea or help would be great :)

Best,
Neda

As reported by Thomas in the mailing list, text output import fails with the following error.

Happens also with the rolling cylinder example of SkyEngin.

This issue can count towards the entry exam for the Blendyn related projects for MBDyn-GSoC2017
This issue may be quite challenging and not much support can be given by the mentors

In its current form, the Blendyn plugin needs a series of Python packages such as numpy, netCDF4, pygal, cairosvg, tinycss, lxml, cssselect, etc. to run with full potential. These packages are not part of the official Blender binaries that are released on the official Blender website. Furthermore, the pip interface required to install Python packages is not available in the Python that comes with precompiled versions of Blender.

This means that only the system's installed Blender, which uses the system's installed Python, which in turn has the pip package manager can be used adequately with Blendyn.

A solution would be useful for all those who want to use the latest Blender version with Blendyn.

As stated above, it may be a challenging and long task as we have already attempted solutions such as installing precompiled Blenders from different sources, compiling Blender, using the system's Python with a precompiled Blender, copying/linking the interested packages from the system's Python into Blender's Python and none of those solutions worked properly. Good luck.

Hi @zanoni-mbdyn

If I were to try to develop the project https://github.com/zanoni-mbdyn/blendyn/projects/3, what is the path for getting the beam internal forces from MBDyn?

Thanks
Rafael

Describe problem:

An error popped up when I tried to load .log file after importing .mov file, as shown below:

Python: Traceback (most recent call last):
  	File "/home/tranhuunhathuy/.config/blender/3.1/scripts/addons/blendyn-master/blendyn.py", line 931, in invoke
    	return self.execute(context)
  	File "/home/tranhuunhathuy/.config/blender/3.1/scripts/addons/blendyn-master/blendyn.py", line 866, in execute
    	ret_val, obj_names = parse_log_file(context)
  	File "/home/tranhuunhathuy/.config/blender/3.1/scripts/addons/blendyn-master/baselib.py", line 384, in parse_log_file
    	mbs.num_timesteps = mbs.num_rows/mbs.num_nodes
	TypeError: bpy_struct: item.attr = val: BLENDYN_PG_settings_scene.num_timesteps expected an int type, not float

        location: <unknown location>:-1

Conditions to reproduce:

• Ubuntu 20.04.4
• MBDyn 1.7.3
• Current version of Blendyn
• Blender 3.1.2
• Python 3.8.10
• All dependencies of MBDyn, Blender and Blendyn installed

Steps to reproduce:

1. Take one input file from MBDyn examples and run simulation with MBDyn.
2. On Blendyn interface, import .mov output file by clicking Select results file.
3. Click Load .log file.

Verified solution:

Force type-cast to int for mbs.num_timesteps.

The ability to load labels from MBDyn is, in my opinion, extremely useful, as it allows to stop worrying about which number goes with which node and in a case where someone is using a preprocessor, to actually not even see these numbers anymore.

That said, I find it somewhat restrictive. For example, I use my own (integer) variable naming convention which is incompatible with what is allowed by Blendyn.
I also often use the same numerical value for different objects (ie: a node, a joint, and a reference frame) and this is currently disallowed by the code. I am conscious that there is a bit of risk in doing what I am proposing here, but it could perhaps be associated with a "extreme" checkbox next to the load labels button? So the code below does load any integer from the log file and will assign it to any beam, node, ref frame, or joint that has the matching number. Note that if both a beam and a node have the same label as a result of this method, it is guaranteed to be wanted by the user.
PS: I've also changed type and dict to some more generic terms, to avoid confusion...

def assign_labels_extreme(context):
    """ Function that parses the (optional) labels file and assigns \
        the string labels it can find to the respective MBDyn objects """

    mbs = context.scene.mbdyn
    nd = mbs.nodes
    ed = mbs.elems
    rd = mbs.references
    objList = [nd,ed,rd]

    labels_changed = False

    log_file = os.path.join(os.path.dirname(mbs.file_path), \
            mbs.file_basename + '.log')

    set_strings_any = ["  const integer", \
                        "  integer"]

    def assign_label(line, set_string, theObj):
        line_str = line.rstrip()
        eq_idx = line_str.find('=') + 1
        label_int = int(line_str[eq_idx:].strip())
        label_str = line_str[len(set_string):(eq_idx -1)].strip()
        print ("set_string:" + set_string)
        print ("line_str:" + line_str)
        print ("label_str:" + label_str)
        for item in theObj:
            if item.int_label == label_int:
                if item.string_label != label_str:
                    item.string_label = label_str
                    return True
                break
        return False

    try:
        with open(log_file) as lf:
            for line in lf:
                found = False
                for set_string in set_strings_any:
                    if set_string in line:
                        for theObj in objList:
                            labels_changed += (assign_label(line, set_string, theObj))
                        found = True
                        break
    except IOError:
        print("Blendyn::assign_labels_extreme(): can't read from file {}, \
                sticking with default labeling...".format(log_file))
        return {'FILE_NOT_FOUND'}

    if labels_changed:
        return {'LABELS_UPDATED'}
    else:
        return {'NOTHING_DONE'}
# -----------------------------------------------------------
# end of assign_labels_extreme() function

This feature request may require a lot of work.

When creating a scientific simulation, the interest of the user is quite often in the actual numbers.

In its current state, Blendyn does not provide a simple method to print data from the simulation in text form above the rendered animation. It would be great feature if this were made possible. Perhaps the best approach would be to let the user create an equation from the results. For example, if the user wants to show absolute velocity of a node, they could have the "(X_vel^2+Y_vel^2+Z_vel^2)^(1/2)" info printed for each frame of the animation. Time would obviously also be useful.

Here are some examples from animations I have done in the past, but I always did them using post-processing on the Blender/OtherSoftware rendered animation images:

Here a simple example: https://youtu.be/VG4qZFkcFnU

And a more complex one: http://louisgagnon.com/pressPlot.gif

One of the two boxes of the standard import visualization of deformable displacement joint is placed incorrectly with respect to the node.
Could be a similar problem as in #47

Hello, everyone.
I am a new user of blendyn. It looks insteresting to render MBDyn model in blender.
However, when I tried to render a rotating beam, I find the beam will rotate 360deg (eg. from -180 to 180) druing the rotation, resulting in a flip in the animation, such as the one in the gif.
Is it about the description of rotation in two softwares?
And do you have any idea to fix it, or any suggestion ?
Thanks,
Best regards,
Runsen.

Currently, the Blendyn interface reports the name of the MBDyn results file which has been imported, but does not give the path. In some cases this can lead to confusion. For example, I run parametric iterations of the same model which always gets created with the same filename but in a different folder. It can be confusing for me to remember which one I have loaded.

I think a simple solution to this would be to have the full path of the imported file show up when the user places the mouse over the short name of the imported file.

@louisgag, I'm opening this in relation to #38 : seems to me that the correct interpretation was actually the previous one, in which the order of the three Euler angles should be reversed in Blender, with respect to MBDyn conventions.

Simple test: define a new Empy Axes, rotate it of some amount about its X axis, then of some other amount about the new Y axis, then again of something about the new Z axis. Read the angles in the Item tab and you'll see that the angles differ with respect to those you gave during the individual rotations. Now switch to the 'ZYX' parametrization, redo the same and you'll see that this time the values coincide.

So it seems that the Blender convention is to store in the Euler angles the three subsequent rotations that bring the object from the global orientation to the local one and not, as usual, the opposite direction.

I'm reverting back to how things were done before #38, in the new branch eulerangles. Can you please test and report? I'm doing the same.

Blendyn seems to not like handling the output of an MBDyn simulation in which output meter was set.
Both Standard Import and eigenanalysis visualization fail, with index out of range errors.

I downloaded the zip and I used blender 2.80. And I followed the pendulum tutorial second case(https://www.mbdyn.org/userfiles/documents/tutorials.pdf) so here is my mbd file. From the case, the body should be at the same position as the node while the joint should be at the origin. But in my blendyn, I have the joint at the node while the body somewhere below the node.

begin: data;
    problem: initial value; # the default
end: data;

begin: initial value;
    initial time: 0.;
    final time: 1.;
    time step: 1.e-3;
    max iterations: 10;
    tolerance: 1.e-6;
end: initial value;

begin: control data;
    structural nodes:
        +1 # node in the constraint
    ;
    rigid bodies:
        +1 # node in the constraint
    ;
    joints:
        +1 # node in the constraint: revolute
    ;
    gravity;
end: control data;

set: integer Pendulum = 1;
set: integer Mass = 2;
set: real M = 1.;
set: real L = .5;
set: real Omega0 = .2;

reference: Pendulum,
    reference, global, null,
    reference, global, eye,
    reference, global, null,
    reference, global, 0., Omega0, 0.;
reference: Mass,
    reference, Pendulum, 0., 0., -L,
    reference, Pendulum, eye,
    reference, Pendulum, null,
    reference, Pendulum, null;

begin: nodes;
    structural: 2000+Mass, dynamic,
        reference, Mass, null,
        reference, Mass, eye,
        reference, Mass, null,
        reference, Mass, null;
    # no dynamic dofs (it will be fully grounded)
end: nodes;

begin: elements;
    body: 2000+Mass, 2000+Mass,
        M,
        reference, Mass, null,
        null; 
        /* The problem is non-singular
        * because of the constraint */
    joint: 2000+Mass, revolute pin,
        2000+Mass,
        reference, Pendulum, null,
        hinge, reference, Pendulum,
        1, 1.,0.,0., 3, 0.,1.,0.,
        reference, Pendulum, null,
        hinge, reference, Pendulum,
        1, 1.,0.,0., 3, 0.,1.,0.;

    gravity: 0., 0., -1., const, 9.81;
end: elements;

Nodes whose output is disabled by "output, no" cards are not handled correctly:

• if using text output, an exception occurs when loading the .log file, or when using the Standard Import button;
• if using NetCDF output, the exception appears when trying to animate.

Hi,

I'm wondering if there is some way to turn off the node axis indicator in Blender.

My apologies if this is not a problem but rather due to my lack of knowledge on using Blender.

Thanks
Rafael