Thanks, I am now looking into the c++ version Il giorno sabato 20 aprile 2024 alle 11:42:23 UTC+2 Radu Serban ha scritto:
> Marco, > > > > You do not indicate what version of the PyChrono conda package you are > using. > > From your message, I infer that this is likely a package corresponding to > the current main development code. However, that doesn’t seem to be > consistent with some line numbers you refer to. Please make sure you look > at the right demo for whatever PyChrono distribution you are using! Please > see the notice (marked in red) at the top of > https://api.projectchrono.org/tutorial_table_of_content_pychrono.html > > > > Having said that, the scripts in src/demos/python/chrono-tensorflow/envs/ > were out-of-date. I pushed a fix to update them to the latest Chrono API. > Keep in mind that these are *not* included in any PyChrono conda package > yet! > > > > My suggestion would be to: > > 1. Use the C++ API if possible. > 2. If you must stick with Python, build your own PyChrono from the C++ > sources instead of using a conda package. > > In either case, use the latest Chrono code, in the ‘main’ branch of the > GitHub repository. > > > > (As a side note, to answer your question about ChFrame, in Python you > should be using ChFrame*d* – look for other uses of this in the very same > script). > > > > --Radu > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *Marco Zanichelli > *Sent:* Friday, April 19, 2024 11:10 AM > *To:* ProjectChrono <[email protected]> > *Subject:* [chrono] Chtrain_pendulum > > > > Dear all, > > > > I am new to project chrono, I have installed pychrono via anaconda on > windows and I have been running some tests. > > My goal for the moment would be to run a MB simulation of an inverted > pendulum, with the later goal of producing a simulation of an inverted > pendulum on a cart. > > > > I have seen that at the path "demos\chrono-tensorflow\envs" there is > already available a script that should already do the latter. > > The problem I'm having is that the demo does not seem to run on the > version of pychrono I am using (the latest build for win). I will now refer > to the files env_test.py and chtrain_pendulum.py . > > > > The first issue I face is with: > > self.body_rod_shape = chrono.ChVisualShapeCylinder() > > self.body_rod_shape.GetCylinderGeometry().p1= self.cyl_base1 > > self.body_rod_shape.GetCylinderGeometry().p2= self.cyl_base2 > > self.body_rod_shape.GetCylinderGeometry().rad= self.radius_rod > > For which I get the error telling me that the ChVisualShapeCylinder has no > attribute GetCylinderGeometry. > > I have worked around this problem by just assigning a radius and height to > the first of those 4 lines and discarding the other 3, not sure if that is > a good solution. > > > > The problem that I have not be able to fix is related to > ImposeAbsoluteTransform > > which I found in rows 143 and 147 of the chtrain_pendulum.py file. By > looking at the documentation for the C++ version, that method is supposed > to take as argument a ChFrame, whereas in the demo the argument given is a > ChCoordsysd built with a ChVector3d. > > > > ImposeAbsoluteTransform(chrono.ChCoordsysd(chrono.ChVector3d(0,0,0))) > > > > This gives an error so I tried to build a chframe as follows: > > > ImposeAbsoluteTransform(chrono.ChFrame(chrono.ChCoordsysd(chrono.ChVector3d( > 0,0,0)))) > > but the error is telling me that ChFrame does not exist in pychrono. > > > > How can I fix this issue? Is there anywhere a specific documentation for > pychrono or should I switch to the C++ version? > > > > I am sorry if I was unclear and I am of course available to give more > information about this. Thank you in advance. > > Best regards, > > Marco > > -- > You received this message because you are subscribed to the Google Groups > "ProjectChrono" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/projectchrono/9c38cb0a-d450-4c42-90bd-13833456c537n%40googlegroups.com > > <https://urldefense.com/v3/__https:/groups.google.com/d/msgid/projectchrono/9c38cb0a-d450-4c42-90bd-13833456c537n*40googlegroups.com?utm_medium=email&utm_source=footer__;JQ!!Mak6IKo!J_caS_PIP6Hn16fUgx86Y7n19RR4b8xIQ3-L2vz2r8_-c43b_VFBE8CQjtOi-fYk3GTc3l9PanLYfvDIeg$> > . > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/e6e3da9d-243b-4840-b5cd-8c8707a85bc2n%40googlegroups.com.
