Step 1: install IrrOdEdit
Copy the file IrrOdEdit.dll to the "<IrrEdit Directory>/plugins" and the content of the "<IrrODE Directory>/data/IrrOdEdit" to the "<IrrEdit Directory>/resources". After starting IrrEdit you should be able to add all IrrODE scene nodes in the editor.
Step 2: creating an IrrODE scene in IrrEdit
We start with an empty scene that just contains a skybox and a camera
Next we add a CIrrOdeWorld scene node and adjust it's parameters. Set the position to (0,0,0) and the gravity to (0,-10,0). The cube that shows the world will not be visible in the application, it's just a dummy that is displayed so there is something to display in the editor. This is the same for all IrrODE scene nodes.
Next we add the box that our sphere will drop on. First we need to add an AnimatedMeshSceneNode and set it's texture, next we add a CIrrOdeGeomBox scene node and adjust the parameters of all these nodes. Set the position of both the AnimatedMeshSceneNode and the CIrrOdeGeomBox scene node to (0,0,0).
This is the place where the XML files defining the surface attributes get involved. The XML file "data/bounce.xml" is the one necessary for this little demo. This is the content of the file:
<parameters>
<attributes>
<string name="name" value="bounce" />
<bool name="mode_mu2" value="false" />
<bool name="mode_fdir1" value="false" />
<bool name="mode_bounce" value="true" />
<bool name="mode_softERP" value="false" />
<bool name="mode_softCFM" value="false" />
<bool name="mode_motion1" value="false" />
<bool name="mode_motion2" value="false" />
<bool name="mode_motionN" value="false" />
<bool name="mode_slip1" value="false" />
<bool name="mode_slip2" value="false" />
<bool name="mode_approx1_1" value="false" />
<bool name="mode_approx1_2" value="false" />
<float name="mu" value="0.000000" />
<float name="mu2" value="0.000000" />
<float name="bounce" value="1.000000" />
<float name="bounce_vel" value="0.000000" />
<float name="soft_erp" value="0.000000" />
<float name="soft_cfm" value="0.000000" />
<float name="motion1" value="0.000000" />
<float name="motion2" value="0.000000" />
<float name="motionN" value="0.000000" />
<float name="slip1" value="0.000000" />
<float name="slip2" value="0.000000" />
<bool name="damps" value="false" />
</attributes>
</parameters>
Enter the relative path (from the directory of the program using the scene file) of this surface definition file in the "surfaceDefinitions" attribute of the "CIrrOdeWorld" object you use. Now switch back to the CIrrOdeGeomBox you just inserted and you'll notice that there is a "surface" combobox in the node specific parameters of this node, and that the only entry is "bounce". Select this option and you'll have a bouncy box in your scene.
The data relevant for this demo is the "bounce" tag. The value of "1" defines that a full bounce will occur. For the rest of the data please refer to the ODE documentation.
In order to get some dynamic stuff into our scene we will add a sphere that will bounce off our static box. I think I heard that before ... somewhere. First we add a CIrrOdeBody scene node as child of the CIrrOdeWorld node. Set it's position to (0,15,0). Next we need another AnimatedMeshSceneNode as child of our body. The position of this new node needs to be (0,0,0). We're almost done now, all that's left to do is to add a CIrrOdeGeomSphere scene node as child of the child of our body. Set it's position to (0,0,0) as well and don't forget to make the surface bouncy selecting the "bounce" option in the surface combobox..
Now save the scene so that you can load it later on.
Step 3: loading the scene from an IrrODE program
Before we can do this you have to go throught the first 3 steps of the first tutorial in order to get an empty IrrODE application. After that instead of adding the the IrrODE scene nodes by hand we just load the file we have created before.
smgr->loadScene("data/IrrOdEdit_example.xml");
Now the code of your main file should look something like this:
#include <irrlicht.h>
#include <IrrODE.h>
using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;
using namespace ode; //This is the namespace of all IrrODE stuff
int main(int argc, char** argv) {
IrrlichtDevice *device=createDevice(EDT_DIRECT3D9,
dimension2d(640,480),
16,false,false,false,0);
device->setWindowCaption(L"Hello World! - Irrlicht-ODE Engine Demo");
IVideoDriver *driver = device->getVideoDriver();
ISceneManager *smgr = device->getSceneManager();
IGUIEnvironment *guienv = device->getGUIEnvironment();
ICursorControl *pCursor=device->getCursorControl();
pCursor->setVisible(false);
CIrrOdeSceneNodeFactory cFactory(smgr);
smgr->registerSceneNodeFactory(&cFactory);
smgr->loadScene("data/IrrOdEdit_example.xml");
//install the ODE
CIrrOdeManager::getSharedInstance()->install(device);
//init the ODE
CIrrOdeManager::getSharedInstance()->initODE();
CIrrOdeManager::getSharedInstance()->initPhysics();
ICameraSceneNode *cam=reinterpret_cast<ICameraSceneNode *>
(smgr->getSceneNodeFromName("theCamera"));
cam->setTarget(vector3df(0,0,0));
//let's run the loop
while(device->run()) {
//step the simulation
CIrrOdeManager::getSharedInstance()->step();
//now for the normal Irrlicht stuff ...
//begin, draw and end scene
driver->beginScene(true, true, SColor(0,200,200,200));
smgr->drawAll();
guienv->drawAll();
driver->endScene();
}
//drop the world so it is destroyed
device->drop();
return 0;
} After you got everything compiled and started you have almost the same result as in tutorial01 (ok, this one looks better because of the skybox), but this time by using IrrEdit and with much less programming work.
