Jack,
You misunderstand the meaning of the Chrono and Chrono::Vehicle data paths.
What you are supposed to provide through the functions chrono.SetChronoDataPath
and veh.SetDataPath are the locations of *directories* containing data file.
With what you have, the terrain file is probably found fine, but the incorrect
setting for the vehicle data path may mess up something else (difficult to tell
without seeing your code, but one possibility is if you are using some
visualization mesh for the HMMWV vehicle).
Try something like this:
chrono.SetChronoDataPath('Users/wagne/anaconda3/envs/pychrono/Library/data/)
veh. SetDataPath(chrono.GetChronoDataPath() + ‘vehicle/')
…
terrain = veh.RigidTerrain(hmmwv.GetSystem(),
veh.GetDataFile(‘terrain/WaveFrontTest.json’)
…
(Of course, this also assumes that your JSON terrain specification file is
correct)
--Radu
From: [email protected] <[email protected]> On Behalf
Of Jack Wagner
Sent: Sunday, August 4, 2024 10:35 PM
To: ProjectChrono <[email protected]>
Subject: [chrono] Re: Issues With Importing JSON for RigidTerrain (PyChrono)
Additionally, I am using the win-64_pychrono-9.0.0-py39_4852 package downloaded
through Anaconda.
On Sunday, August 4, 2024 at 2:53:11 PM UTC-4 Jack Wagner wrote:
I have been trying to import the example RigidTerrain JSON with the example
Wavefront OBJ to examine vehicle behavior on variable landforms and learn more
about the wavefront terrain structure, however just trying to implement it into
the simulation is causing me issues. I have the following code block to signify
the directory for the JSON file:
chrono.SetChronoDataPath('Users/wagne/anaconda3/envs/pychrono/Library/data/vehicle/terrain/')
veh.SetDataPath(chrono.GetChronoDataPath() + 'WaveFrontTest.json')
terrain_file = veh.GetDataPath()
Then simply implement and initialize the terrain with the terrain file:
terrain = veh.RigidTerrain(hmmwv.GetSystem(), terrain_file)
terrain.Initialize()
However, every time I try to run this, I receive a fatal access violation and
am unsure of what i am doing wrong. I keep thinking it's a simple syntax issue,
however everything I try moving around (making terrain_file equal to the exact
data path, switching around using Set/GetDataPath, etc.) has been ineffective.
Assistance would be very helpful. Below is a copy of my terminal's output and
the JSON file I am using for reference, although the JSON is nearly identical
to the example specified in the PyChrono documentation.
[https://groups.google.com/u/5/group/projectchrono/attach/5a8640db5350f/Screenshot%202024-08-04%20145215.png?part=0.2&view=1]
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