ifcclash fcl dependency not available for python 3.8

[CyrilWaechter]

I am very much interested in ifcclash but I am a little worried about python-fcl dependency :

• No python 3.8 wheel is available from pypi for python-fcl
• Building python-fcl from source is complicated as it depends on fcl 0.5.0 (current version is 0.6.1 see issue Support the latest version of FCL (v0.6.1)? BerkeleyAutomation/python-fcl#19).
• python-fcl seems to be inactive since june 2019.

On the good side there is 2 PR to port it to fcl 0.6 but they were made in march and april but non have been merged at the moment :

• Update to FCL-0.6.1 BerkeleyAutomation/python-fcl#21
• Updating to support FCL 0.6.x (incompatible with FCL 0.5.x and earlier) BerkeleyAutomation/python-fcl#20

[Moult]

FCL is also not distributed for Mac :(

I wish I had a solution :(

[CyrilWaechter]

For mac you might try to use : https://anaconda.org/jf/python-fcl/files
A build is available for python 3.8 : https://anaconda.org/jf/python-fcl/0.6.0/download/osx-64/python-fcl-0.6.0-py38h39e3cac_1.tar.bz2
I assume it was made by @jf--- whom I saw also around pythonocc, pyOCCT etc…

[Moult]

@CyrilWaechter I'm looking for Python 3.7, since the Python version must match the version used by Blender. But thanks for the link :)

[CyrilWaechter]

I have been able to compile python-fcl thanks to DmitryNeverov fork with a small fix DmitryNeverov/python-fcl#1.
It depends on fcl 0.6.1. I used fcl AUR package but fcl is really easy to compile it should be simple to reproduce on any platform.

Can you explain briefly how ifcclash works in blender so I can test if it works without issue ?
I created 2 cubes of class IfcAirTerminal and tried this config :

I see a .json file but it apparently without any clash inside.

[Moult]

What you've done looks correct. I have just tested with two files of the default cube and I do indeed get a clash result. The resulting JSON file created by executing IFC clash should look something like the following below. Note that even if there are no clashes, the metadata about name/tolerance/a/b should still be in the JSON file, except that clashes would be a blank dictionary or not exist. If you get a totally empty JSON file, that suggests something else has gone wrong and perhaps investigating the console would help.

[
    {
        "name": "New Clash Set",
        "tolerance": 0.009999999776482582,
        "a": [
            {
                "file": "/home/dion/drive/bim/a.ifc",
                "selector": ".IfcBuildingElementProxy",
                "mode": "i"
            }
        ],
        "b": [
            {
                "file": "/home/dion/drive/bim/b.ifc",
                "selector": ".IfcBuildingElementProxy",
                "mode": "i"
            }
        ],
        "clashes": {
            "0x4qYS0_DAPuPscMo8tRsN-2I1UDajiL3IfFIlUGmbYYK": {
                "a_global_id": "0x4qYS0_DAPuPscMo8tRsN",
                "b_global_id": "2I1UDajiL3IfFIlUGmbYYK",
                "a_ifc_class": "IfcBuildingElementProxy",
                "b_ifc_class": "IfcBuildingElementProxy",
                "a_name": "Cube",
                "b_name": "Cube",
                "normal": [
                    -1.0,
                    0.0,
                    0.0
                ],
                "position": [
                    -1.0,
                    -1.0,
                    1.0
                ],
                "penetration_depth": 2.0
            }
        }
    }
]

[CyrilWaechter]

I get result like yours running it from full packaged blender bim addon on windows without issue. Issue apparently comes from a type input change inside fcl.Transform :

python ifcclash.py "/home/cyril/Documents/Blender/clash_test.json" --output="/home/cyril/Documents/Blender/clash_test.json"
Creating collision manager a ...
Loading files a ...
Purging unnecessary elements a ...
Creating collision data for a ...
[#########################                         ]Creating object #84=IfcAirTerminal('1pW0h7YWP4O8PXtP5Xbd1x',$,'Cube',$,$,#75,#83,$,.DIFFUSER.)
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
Exception ignored in: 'fcl.fcl.numpy_to_mat3d'
Traceback (most recent call last):
  File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object
    t = fcl.Transform(transform[:3, :3], transform[:3, 3])
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
Exception ignored in: 'fcl.fcl.numpy_to_vec3d'
Traceback (most recent call last):
  File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object
    t = fcl.Transform(transform[:3, :3], transform[:3, 3])
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
Creating collision manager b ...
Loading files b ...
Purging unnecessary elements b ...
Creating collision data for b ...
[#########################                         ]Creating object #84=IfcAirTerminal('0_sCMOjkr8hfXc12UIa2AS',$,'Cube',$,$,#75,#83,$,.DIFFUSER.)
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
Exception ignored in: 'fcl.fcl.numpy_to_mat3d'
Traceback (most recent call last):
  File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object
    t = fcl.Transform(transform[:3, :3], transform[:3, 3])
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
Exception ignored in: 'fcl.fcl.numpy_to_vec3d'
Traceback (most recent call last):
  File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object
    t = fcl.Transform(transform[:3, :3], transform[:3, 3])
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'

I don't know numpy a lot. I'll investigate more later.

[aothms]

From the looks of it, wrapping `transform` in a `numpy.float64()` might fix that Sent from a mobile device. Excuse my brevity. Kind regards, Thomas Op za 25 jul. 2020 17:07 schreef Cyril Waechter <notifications@github.com>:

…

I get result like yours running it from full packaged blender bim addon on windows without issue. Issue apparently comes from a type input change inside fcl.Transform : python ifcclash.py "/home/cyril/Documents/Blender/clash_test.json" --output="/home/cyril/Documents/Blender/clash_test.json"Creating collision manager a ...Loading files a ...Purging unnecessary elements a ...Creating collision data for a ... [######################### ]Creating object #84=IfcAirTerminal('1pW0h7YWP4O8PXtP5Xbd1x',$,'Cube',$,$,#75,#83,$,.DIFFUSER.)ValueError: Buffer dtype mismatch, expected 'double' but got 'float'Exception ignored in: 'fcl.fcl.numpy_to_mat3d'Traceback (most recent call last): File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object t = fcl.Transform(transform[:3, :3], transform[:3, 3])ValueError: Buffer dtype mismatch, expected 'double' but got 'float'ValueError: Buffer dtype mismatch, expected 'double' but got 'float'Exception ignored in: 'fcl.fcl.numpy_to_vec3d'Traceback (most recent call last): File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object t = fcl.Transform(transform[:3, :3], transform[:3, 3])ValueError: Buffer dtype mismatch, expected 'double' but got 'float'Creating collision manager b ...Loading files b ...Purging unnecessary elements b ...Creating collision data for b ... [######################### ]Creating object #84=IfcAirTerminal('0_sCMOjkr8hfXc12UIa2AS',$,'Cube',$,$,#75,#83,$,.DIFFUSER.)ValueError: Buffer dtype mismatch, expected 'double' but got 'float'Exception ignored in: 'fcl.fcl.numpy_to_mat3d'Traceback (most recent call last): File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object t = fcl.Transform(transform[:3, :3], transform[:3, 3])ValueError: Buffer dtype mismatch, expected 'double' but got 'float'ValueError: Buffer dtype mismatch, expected 'double' but got 'float'Exception ignored in: 'fcl.fcl.numpy_to_vec3d'Traceback (most recent call last): File "/home/cyril/.config/blender/2.83/scripts/addons/blenderbim/libs/site/packages/collision.py", line 195, in add_object t = fcl.Transform(transform[:3, :3], transform[:3, 3])ValueError: Buffer dtype mismatch, expected 'double' but got 'float' I don't know numpy a lot. I'll investigate more later. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#919 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAILWV7N224NAIJ6TR4AYILR5LYKDANCNFSM4PBUHOSQ> .

[CyrilWaechter]

From the looks of it, wrapping transform in a numpy.float64() might fix that

@aothms you were absolutely right. Thanks.

[Moult]

Closing bug, as the BlenderBIM Add-on is Python 3.7 based, and so getting fcl distributed for Python 3.8 should be an upstream issue.