Hi Radu, thank you for your suggestion. In the end it worked by limiting the simulating volume of interest! Now, I am facing an issue with the command GetAppliedTorque() and GetAppliedForce(). I have defined the ChBody object in my simulation which is subjected to different loads and I need to verify if this ones are in line with what is predicted by theory. However, as soon as I start the application, the simulation crashes without any output error. I am sure that the problem is related to this commands since as soon as I comment them out everything works. Has anybody else ever experienced something similar?
Thank you in advance for your help! Gianni Il giorno lunedì 16 dicembre 2024 alle 13:56:04 UTC+1 Radu Serban ha scritto: > Hi Gianni, > > > > Because of the data structures used in Chrono::Multicore, removing > elements after system construction is more complicated and expensive, so we > opted to not provide this capability. > > > > To address the type of issues you are seeing (indeed, as collision shapes > move farther and farther apart, the computational cost of the collision > broadphase in Chrono::Multicore increases), you can define a region around > the computational domain of interest. With that option enabled, bodies > located outside that region will be frozen (in that their state is not > updated anymore) > > You do that by (1) enabling this option and (2) providing the corners of > an axis-aligned bounding box that defines the “active” domain. > > An illustration of this setting is in demo_MCORE_mixerNSC > <https://github.com/projectchrono/chrono/blob/097865c8dd950886be40821aee1f3c13e32bd599/src/demos/multicore/demo_MCORE_mixerNSC.cpp#L167> > > in the commented-out lines 168-170. > > > > --Radu > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *Gianni Curti > *Sent:* Monday, December 16, 2024 12:56 PM > *To:* ProjectChrono <[email protected]> > *Subject:* Re: [chrono] Difference between ChBodyEasyCylinder and > AddCylinderGeometry > > > > Hi Radu and Maksym, > > > > thank you for your answer and kindness. > > Lately, I was also trying to use the command "RemoveBody()" in the > Multicore environment to remove two bodies that falls out of my volume of > interest. Otherwise, as they increase their distance from the other bodies, > the simulation visibly slows down. However, when I implement this command I > get the following error message at the beginning of the simulation. > > > Is there any other way to remove these two bodies from the simulation? > > Thanks in advance. > > > > Gianni > > Il giorno venerdì 29 novembre 2024 alle 13:26:01 UTC+1 Radu Serban ha > scritto: > > Hi Gianni, > > > > ChBodyEasyCylinder creates a body representing a solid cylinder centered > at the body COM and aligned along the specified axis of the COM frame. The > body mass and inertia is set automatically assuming the cylinder is solid > and has constant density. > > AddCylinderGeometry allows you to attach a cylindrical shape (for > collision and, optionally also visualization) to an existing body. This > utility function allows you to position this cylinder arbitrarily relative > to the body COM. This is what “Position on body” represents (a translation > of the cylinder shape from the body COM and expressed in the body COM > frame. It is your responsibility to construct the body (including setting > its inertial properties). > > > > Note that ChBody::SetPos() sets the origin of the body COM frame relative > to the absolute coordinate. It is important to understand well all the > frames involved and in what frame various quantities are relative to and > expressed in. > > See for example the first figure on this Chrono documentation page: > https://api.projectchrono.org/development/collisions.html#collision_models_shapes > > <https://urldefense.com/v3/__https:/api.projectchrono.org/development/collisions.html*collision_models_shapes__;Iw!!Mak6IKo!M1N1xkpPgwUX8debhG2NoYwS8xOkXEl2iE_2wA1atPG4NhTpCejq3PBHN_SG2XgrIB7urdtomJ8ChEGod_2e$> > . > > > > --Radu > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *Gianni Curti > *Sent:* Wednesday, November 20, 2024 7:26 PM > *To:* ProjectChrono <[email protected]> > *Subject:* [chrono] Difference between ChBodyEasyCylinder and > AddCylinderGeometry > > > > Hi, > > I have a question regarding the difference between the commands > "ChBodyEasyCylinder" and "AddCylinderGeometry". For what I have understood, > the first one automatically calculates the mass and inertia of a body > depending on the sizes and density given, while the second one provides > only the collision shape of a cylinder (neither mass nor density if they > are not manually given). However, I saw that there is the possibility of > assigning the "Position on body" when using "AddCylinderGeometry" through a > ChVector3d but the result is pretty different from what I obtain by using > "SetPos" when I also apply a rotation to the body. What does this command > do exactly? > > Thank you in advance for yout patience and kindness. > > > > Best Regards > > > > Gianni > > -- > You received this message because you are subscribed to the Google Groups > "ProjectChrono" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/projectchrono/10d9deb5-26b4-4ebe-a37b-41e1fdec1037n%40googlegroups.com > > <https://urldefense.com/v3/__https:/groups.google.com/d/msgid/projectchrono/10d9deb5-26b4-4ebe-a37b-41e1fdec1037n*40googlegroups.com?utm_medium=email&utm_source=footer__;JQ!!Mak6IKo!LZqh0A2nDt0mRsewyds4KGDxAMXR0yiR6uVrKzMnUhhgRxnzpGL_G-mItt0BNX6E85FtgDOxibRx1YgTxMNb$> > . > > -- > 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 visit > https://groups.google.com/d/msgid/projectchrono/a4f47d9a-447f-4b8a-8381-8b0fd3b3efd1n%40googlegroups.com > > <https://urldefense.com/v3/__https:/groups.google.com/d/msgid/projectchrono/a4f47d9a-447f-4b8a-8381-8b0fd3b3efd1n*40googlegroups.com?utm_medium=email&utm_source=footer__;JQ!!Mak6IKo!M1N1xkpPgwUX8debhG2NoYwS8xOkXEl2iE_2wA1atPG4NhTpCejq3PBHN_SG2XgrIB7urdtomJ8ChAHuzvYP$> > . > -- 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 visit https://groups.google.com/d/msgid/projectchrono/fc0f3582-6d39-419c-a5c5-301f369a9e6en%40googlegroups.com.
