Hi, My previous post (https://groups.google.com/g/projectchrono/c/A7GlGUYS1Ik) failed to garner any engagement, so I did the only thing I could think of in the situation and moved to C++ to remove any Python/SWIG-related issues.
*As much as I try, I can't get ChBody's to work with ChGravityLoader.* I started from demo_IRR_visualize_collision.cpp and made only two notable changes: * I removed the built-in gravity by calling SetGravitationalAcceleration with the zero vector * I added back the gravity individually to each object through a ChLoadContainer and a ChLoad for each object. The simulation does not run at all when I try to use ChSystemNSC. It starts with ChSystemSMC, but it looks like the gravity is working only until the first collision (or some other undetermined condition that I can't recognize). I can't use ChCollisionSystem::Type::MULTICORE, because I didn't build Chrono to support it. Would this collision system solve my issues? The full source is available at https://pastebin.com/fXEmB9Bg These are the changes I've made to the original source code: diff --git a/src/demos/irrlicht/demo_IRR_visualize_collision.cpp b/src/demos/irrlicht/demo_IRR_visualize_collision.cpp index 022d906c7..fc04cba6b 100644 --- a/src/demos/irrlicht/demo_IRR_visualize_collision.cpp +++ b/src/demos/irrlicht/demo_IRR_visualize_collision.cpp @@ -17,6 +17,8 @@ #include "chrono/collision/bullet/ChCollisionSystemBullet.h" #include "chrono/physics/ChSystemNSC.h" +#include "chrono/physics/ChSystemSMC.h" +#include "chrono/physics/ChLoadContainer.h" #include "chrono/physics/ChBodyEasy.h" #include "chrono/core/ChTimer.h" #include "chrono/core/ChRealtimeStep.h" @@ -59,10 +61,13 @@ int main(int argc, char* argv[]) { std::cout << "Copyright (c) 2017 projectchrono.org\nChrono version: " << CHRONO_VERSION << std::endl; // Create the Chrono system, bodies, and collison shapes - ChSystemNSC sys; + ChSystemSMC sys; + //ChSystemNSC sys; sys.SetCollisionSystemType(csys_type); + sys.SetGravitationalAcceleration(ChVector3d(0, 0, 0)); - auto mat = chrono_types::make_shared<ChContactMaterialNSC>(); + auto mat = chrono_types::make_shared<ChContactMaterialSMC>(); + //auto mat = chrono_types::make_shared<ChContactMaterialNSC>(); auto ground = chrono_types::make_shared<ChBodyEasyBox>(10, 3, 10, 100, mat); ground->SetFixed(true); @@ -95,6 +100,14 @@ int main(int argc, char* argv[]) { mesh->GetVisualShape(0)->SetColor(ChColor(0.2f, 0.3f, 0.6f)); sys.AddBody(mesh); + auto load_container = chrono_types::make_shared<ChLoadContainer>(); + for (auto obj : sys.GetBodies()) { + auto custom_loader = chrono_types::make_shared<ChLoaderGravity>(obj); + auto custom_load = chrono_types::make_shared<ChLoad>(custom_loader); + load_container->Add(custom_load); + } + sys.Add(load_container); + // Create the Irrlicht visualization system auto vis = chrono_types::make_shared<ChVisualSystemIrrlicht>(); vis->AttachSystem(&sys); I feel like I'm hitting something fundamental, but I don't know what it is and where to read more about it. I'm using a 1 week old build of the `main` branch of Project Chrono, with Irrlicht support enabled. The example runs fine if I return the code to the original state, as do all other examples, so I have no reason to believe this is caused by a bad build of Project Chrono. *Can someone please provide any sort of insight as to what is happening?* I'm simply trying to add the simplest ChLoaderUVW force available and it is absolutely not working. Does this even work for ChBody's? I've seen it works with demo_FEA_loads_dynamic, but according to the docs, ChBody is loadable. Best regards, Yavor -- 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 projectchrono+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/projectchrono/7c196944-66d2-4295-abc3-5e8b429d5176n%40googlegroups.com.
