Bullet SoftBody Rope example

C++ coding using Panda3D
1

Hi,

I was trying to port the Setup part of the Python code in the example here https://www.panda3d.org/manual/index.php?title=Bullet_Softbody_Rope&language=python but I’m getting the following errors which I’m not sure how to fix:

1>c:\panda3d-1.9.0-x64\include\bulletsoftbodynode.h(124): error C2061: syntax error : identifier 'BulletRigidBodyNode'
1>c:\panda3d-1.9.0-x64\include\bulletsoftbodynode.h(126): error C2061: syntax error : identifier 'BulletRigidBodyNode'
1>c:\panda3d-1.9.0-x64\include\bulletsoftbodynode.h(128): error C2535: 'void BulletSoftBodyNode::append_anchor(int)' : member function already defined or declared
1>          c:\panda3d-1.9.0-x64\include\bulletsoftbodynode.h(124) : see declaration of 'BulletSoftBodyNode::append_anchor'

This is the code:

#include "bulletSoftBodyNode.h"
#include "bulletWorld.h"
#include "bulletSoftBodyWorldInfo.h"
#include "pandaFramework.h"
#include "windowFramework.h"

AsyncTask::DoneStatus UpdatePhysics(GenericAsyncTask* task, void* data);
BulletWorld* GetPhysicsWorld();

int _tmain(int argc, char* argv[])
{

	PandaFramework* framework;
	framework = new PandaFramework();
    
    // Init everything :D
    framework->open_framework(argc, argv);
    framework->set_window_title("FPF Server");
 
    WindowFramework* window = framework->open_window();

	//from panda3d.bullet import BulletSoftBodyNode
 
	//info = self.world.getWorldInfo()	
	//static BulletWorld* physicsWorld = new BulletWorld();
	BulletSoftBodyWorldInfo worldInfo();
	btSoftBodyWorldInfo info;
	BulletSoftBodyWorldInfo winfo(info);

	winfo.set_air_density(1.2);
	winfo.set_water_density(0);
	winfo.set_water_offset(0);
	winfo.set_water_normal(LVector3(0, 0, 0));
 
	int res = 8;
	LPoint3 p1 = LPoint3(0, 0, 4);
	LPoint3 p2 = LPoint3(10, 0, 4);
	int fixeds = 0;
 
	static 	PT(BulletSoftBodyNode) bodyNode = BulletSoftBodyNode::make_rope(winfo, p1, p2, res, fixeds);
	bodyNode->set_total_mass(50.0);
	NodePath bodyNP = window->get_render().attach_new_node(bodyNode);
	GetPhysicsWorld()->attach_soft_body(bodyNode);

	static AsyncTaskManager* taskManager = AsyncTaskManager::get_global_ptr();
    GenericAsyncTask* physicsTask = new GenericAsyncTask("update physics", &UpdatePhysics, (void*) NULL);
    taskManager->add(physicsTask);

	framework->main_loop();
    framework->close_framework();

	return 0;
}

AsyncTask::DoneStatus UpdatePhysics(GenericAsyncTask* task, void* data) 
{
	ClockObject *co = ClockObject::get_global_clock();
	GetPhysicsWorld()->do_physics(co->get_dt(), 10, 1.0 / 180.0);
	return AsyncTask::DS_cont;
}

BulletWorld* GetPhysicsWorld()
{
	static BulletWorld* physicsWorld = new BulletWorld();
	return physicsWorld;
}

Cheers,
Zobbo

2

Never mind, I reordered my headers and it resolved it.

cheers,
Zobbo

3

I have a question though, is there a C++ equivalent of bodyNode.linkGeom(geom) ? I can’t see anything equivalent.

Cheers,
Zobbo

4

Not sure what you mean. The link_geom method on BulletSoftBodyNode is a C++ method.

5

That code is in the python example on the web page, but you’re right link_geom does exist on BulletSoftBodyNode. I couldn’t find it using the C++ reference search. Though I suppose it’s an obvious place to look.

Cheers,
Zobbo