collision help

[spearfire]

hello
i am searching 4 day's now for a awnser to how to do some simple collisions
i can get it to work with my terrain but not with some objects i created
i hope someone can help tell me how to get collisions with my model
here is my code from my model

spearfire

Code: Select all

my model(without collisions)
//my model
IAnimatedMesh* indu = smgr->getMesh("c:/irrlicht-1.4/media/indus.X");
IAnimatedMeshSceneNode* s = smgr->addAnimatedMeshSceneNode( indu );

if (s)
{
	s = smgr->addAnimatedMeshSceneNode(indu);
    s->setMaterialFlag(EMF_LIGHTING, true);
    s->setPosition(core::vector3df(2150*10,30*2,3650*2));
    s->setScale(core::vector3df(8,8,8));
    s->setRotation(core::vector3df(-90,0,0));
   	s->addShadowVolumeSceneNode();	
         smgr->setShadowColor(video::SColor(220,0,0,0));
}

my camera only with collisions for my terrain
//my camera
scene::ICameraSceneNode* camera = 
    smgr->addCameraSceneNodeFPS(0,45.0f,650.0f);
camera->setPosition(core::vector3df(1900*10,255*2,3700*2));
camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
camera->setFarValue(12000.0f);
scene::ISceneNodeAnimator* anim =
    smgr->createCollisionResponseAnimator(

		selector, camera, core::vector3df(30,30,30),

		core::vector3df(0,-3,0),

		core::vector3df(0,50,0));


	camera->addAnimator(anim);

[B@z]

you have to use meta triangle selector.
search it on forums, you'll find something

[rogerborg]

Specifically...

Code: Select all

scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector();

// Then create your ITriangleSelectors as normal and for each one
// add it to the meta selector, which will take a reference to it
scene::ITriangleSelector * selector = ... create with an appropriate method
meta->addTriangleSelector(selector);
 // And drop your reference to it, so that the meta selector owns it.
selector->drop();


// After adding all the triangle selectors to the meta selector
// create a collision response animator from that meta selector.
// Note that the IMetaTriangleSelector is passed to a method that
// expects an ITriangleSelector.  This is correct; IMetaTriangleSelector
// is derived from ITriangleSelectors, so it IS an ITriangleSelector.
scene::ISceneNodeAnimator* anim = smgr->createCollisionResponseAnimator(meta, camera, core::vector3df(5,5,5), core::vector3df(0,0,0));
meta->drop(); // I'm done with the meta selector now 

[spearfire]

Specifically...

Code: Select all

scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector();

// Then create your ITriangleSelectors as normal and for each one
// add it to the meta selector, which will take a reference to it
scene::ITriangleSelector * selector = ... create with an appropriate method
meta->addTriangleSelector(selector);
 // And drop your reference to it, so that the meta selector owns it.
selector->drop();


// After adding all the triangle selectors to the meta selector
// create a collision response animator from that meta selector.
// Note that the IMetaTriangleSelector is passed to a method that
// expects an ITriangleSelector.  This is correct; IMetaTriangleSelector
// is derived from ITriangleSelectors, so it IS an ITriangleSelector.
scene::ISceneNodeAnimator* anim = smgr->createCollisionResponseAnimator(meta, camera, core::vector3df(5,5,5), core::vector3df(0,0,0));
meta->drop(); // I'm done with the meta selector now 

well i looked at this and searched again for a few hours but i dont seem to get this code to work in my project or find a other code that i could use

could someone put his code in my code(first post)??
i hope someone can help me further

spearfire

[rogerborg]

Sure! Can I get you a beer while I'm up? How about a blowj^W a massage?

[spearfire]

Sure! Can I get you a beer while I'm up? How about a blowj^W a massage?

.....................
hey i am just asking a question if you or someone else could help a beginner if you don't want to awnser it then don't but please do not make this kind of post!!

[frostysnowman]

I was looking over this thread, and have been trying to do the same thing. Here is my code:

Code: Select all

void setCollisionWithObject(ISceneNode* a_obj, const c8 * a_objMeshFilePath, ISceneNode* a_obj2, const c8 * a_obj2MeshFilePath)
{
	ISceneNode* obj = a_obj;
	ISceneNode* obj2 = a_obj2;

	IMesh* objMesh = smgr->getMesh(a_objMeshFilePath);
	IMesh* obj2Mesh = smgr->getMesh(a_obj2MeshFilePath);

	scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector();

	// Then create your ITriangleSelectors as normal and for each one
	// add it to the meta selector, which will take a reference to it
	scene::ITriangleSelector * selector = smgr->createTriangleSelector(objMesh, obj);
	meta->addTriangleSelector(selector);
	
 // And drop your reference to it, so that the meta selector owns it.
	selector->drop();


	// After adding all the triangle selectors to the meta selector
	// create a collision response animator from that meta selector.
	// Note that the IMetaTriangleSelector is passed to a method that
	// expects an ITriangleSelector.  This is correct; IMetaTriangleSelector
	// is derived from ITriangleSelectors, so it IS an ITriangleSelector.
	scene::ISceneNodeAnimator* anim = smgr->createCollisionResponseAnimator(meta, obj2, core::vector3df(5,5,5), core::vector3df(0,-1,0));

	obj2->addAnimator(anim);

	meta->drop(); // I'm done with the meta selector now

}

As you can see, I copied almost entirely all of the code posted above to create this function. Problem is, obj2 just falls through obj's geometry and it does not work. I am confused, can anyone spot my mistake?

[B@z]

well i looked at this and searched again for a few hours but i dont seem to get this code to work in my project or find a other code that i could use

could someone put his code in my code(first post)??
i hope someone can help me further

spearfire

i think this should work

Code: Select all

scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector(); 
scene::ITriangleSelector * selector;
AnimatedMesh* indu = smgr->getMesh("c:/irrlicht-1.4/media/indus.X");
IAnimatedMeshSceneNode* s = smgr->addAnimatedMeshSceneNode( indu );

if (s)
{
   s = smgr->addAnimatedMeshSceneNode(indu); // you should delete it. it creates the same model twice..
   s->setMaterialFlag(EMF_LIGHTING, true);
   s->setPosition(core::vector3df(2150*10,30*2,3650*2));
   s->setScale(core::vector3df(8,8,8));
   s->setRotation(core::vector3df(-90,0,0));
   s->addShadowVolumeSceneNode();   
   smgr->setShadowColor(video::SColor(220,0,0,0));
   selector = smgr->createTriangleSelector(s->getMesh(),s);
   meta->addTriangleSelector(selector);
   selector->drop();
}

my camera only with collisions for my terrain
//my camera
scene::ICameraSceneNode* camera =
smgr->addCameraSceneNodeFPS(0,45.0f,650.0f);
camera->setPosition(core::vector3df(1900*10,255*2,3700*2));
camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
camera->setFarValue(12000.0f);
scene::ISceneNodeAnimator* anim =
smgr->createCollisionResponseAnimator(meta, camera, core::vector3df(30,30,30),core::vector3df(0,-3,0),core::vector3df(0,50,0));
meta->drop();
camera->addAnimator(anim);
anim->drop();

[rogerborg]

Oh balls. This is down to two problems:

1) IAnimatedMesh is now derived from IMesh, so IAnimatedMesh * can be assigned to IMesh * variables and passed to methods that take an IMesh *. However, this generally does not do what you'd expect. You should instead manually do a getMesh(0) on the IAnimatedMesh *.

2) Except that won't work anyway, because IAnimatedMesh::getMesh() doesn't work for skinned meshes in 1.4.

Both of these are known problems. As far as I can tell, there's no sense of urgency to fix them.

In short: accurate per-triangle collision detection with animated meshes is currently borked in Irrlicht 1.4 and the SVN trunk.

[spearfire]

well i looked at this and searched again for a few hours but i dont seem to get this code to work in my project or find a other code that i could use

could someone put his code in my code(first post)??
i hope someone can help me further

spearfire

i think this should work

Code: Select all

scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector(); 
scene::ITriangleSelector * selector;
AnimatedMesh* indu = smgr->getMesh("c:/irrlicht-1.4/media/indus.X");
IAnimatedMeshSceneNode* s = smgr->addAnimatedMeshSceneNode( indu );

if (s)
{
   s = smgr->addAnimatedMeshSceneNode(indu); // you should delete it. it creates the same model twice..
   s->setMaterialFlag(EMF_LIGHTING, true);
   s->setPosition(core::vector3df(2150*10,30*2,3650*2));
   s->setScale(core::vector3df(8,8,8));
   s->setRotation(core::vector3df(-90,0,0));
   s->addShadowVolumeSceneNode();   
   smgr->setShadowColor(video::SColor(220,0,0,0));
   selector = smgr->createTriangleSelector(s->getMesh(),s);
   meta->addTriangleSelector(selector);
   selector->drop();
}

my camera only with collisions for my terrain
//my camera
scene::ICameraSceneNode* camera =
smgr->addCameraSceneNodeFPS(0,45.0f,650.0f);
camera->setPosition(core::vector3df(1900*10,255*2,3700*2));
camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
camera->setFarValue(12000.0f);
scene::ISceneNodeAnimator* anim =
smgr->createCollisionResponseAnimator(meta, camera, core::vector3df(30,30,30),core::vector3df(0,-3,0),core::vector3df(0,50,0));
meta->drop();
camera->addAnimator(anim);
anim->drop();

Thank you verry much i changed your code a bit becaus at first it did not work
but now it finaly WORKS!!! (if you enter the object i gets a bit buggy) i got collisions with my terrain and my model
now i can finaly continue my project
again thank you very much and every one else who helped me

here is my working code for if someone else doesnt get his collisions right

Code: Select all

 IAnimatedMesh* indu = smgr->getMesh("c:/irrlicht-1.4/media/waren.X");
IAnimatedMeshSceneNode* s = smgr->addAnimatedMeshSceneNode( indu );
scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector();
scene::ITriangleSelector * selector1;

if (s)
{
   s->setMaterialFlag(EMF_LIGHTING, true);
   s->setPosition(core::vector3df(2000*10,30*2,3650*2));
   s->setScale(core::vector3df(8,8,8));
   s->setRotation(core::vector3df(-90,-90,0));
   s->addShadowVolumeSceneNode();   
   smgr->setShadowColor(video::SColor(220,0,0,0));
   selector1 = smgr->createTriangleSelector(s->getMesh(),s);
   meta->addTriangleSelector(selector1);
   selector1->drop(); 	
}

//my camera
scene::ICameraSceneNode* camera =
smgr->addCameraSceneNodeFPS(0,45.0f,650.0f);
{
if(camera)
camera->setPosition(core::vector3df(1900*10,255*2,3700*2));
camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
camera->setFarValue(12000.0f);
scene::ISceneNodeAnimator* anim = 
smgr->createCollisionResponseAnimator(meta, camera, core::vector3df(30,30,30),core::vector3df(0,-3,0),core::vector3df(0,50,0));
meta->drop();
camera->addAnimator(anim);
anim->drop();

scene::ISceneNodeAnimator* an = 
smgr->createCollisionResponseAnimator(selector, camera, core::vector3df(30,30,30),core::vector3df(0,0,0),core::vector3df(0,50,0));
selector->drop();
camera->addAnimator(an);
an->drop();
} 

[B@z]

Thank you verry much i changed your code a bit becaus at first it did not work
but now it finaly WORKS!!! (if you enter the object i gets a bit buggy) i got collisions with my terrain and my model
now i can finaly continue my project
again thank you very much and every one else who helped me

here is my working code for if someone else doesnt get his collisions right

Code: Select all

 IAnimatedMesh* indu = smgr->getMesh("c:/irrlicht-1.4/media/waren.X");
IAnimatedMeshSceneNode* s = smgr->addAnimatedMeshSceneNode( indu );
scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector();
scene::ITriangleSelector * selector1;

if (s)
{
   s->setMaterialFlag(EMF_LIGHTING, true);
   s->setPosition(core::vector3df(2000*10,30*2,3650*2));
   s->setScale(core::vector3df(8,8,8));
   s->setRotation(core::vector3df(-90,-90,0));
   s->addShadowVolumeSceneNode();   
   smgr->setShadowColor(video::SColor(220,0,0,0));
   selector1 = smgr->createTriangleSelector(s->getMesh(),s);
   meta->addTriangleSelector(selector1);
   selector1->drop(); 	
}

//my camera
scene::ICameraSceneNode* camera =
smgr->addCameraSceneNodeFPS(0,45.0f,650.0f);
{
if(camera)
camera->setPosition(core::vector3df(1900*10,255*2,3700*2));
camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
camera->setFarValue(12000.0f);
scene::ISceneNodeAnimator* anim = 
smgr->createCollisionResponseAnimator(meta, camera, core::vector3df(30,30,30),core::vector3df(0,-3,0),core::vector3df(0,50,0));
meta->drop();
camera->addAnimator(anim);
anim->drop();

scene::ISceneNodeAnimator* an = 
smgr->createCollisionResponseAnimator(selector, camera, core::vector3df(30,30,30),core::vector3df(0,0,0),core::vector3df(0,50,0));
selector->drop();
camera->addAnimator(an);
an->drop();
} 

uhm does it really work?

Code: Select all

smgr->addCameraSceneNodeFPS(0,45.0f,650.0f);
{
if(camera)
camera->setPosition(core::vector3df(1900*10,255*2,3700*2));
camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
camera->setFarValue(12000.0f);

it means that if the camera isn't initialized, then it won't set the position, but set the target and the far value..

Code: Select all

if(camera)
{
camera->setPosition(core::vector3df(1900*10,255*2,3700*2));

change to this

Code: Select all

scene::ISceneNodeAnimator* an = 
smgr->createCollisionResponseAnimator(selector, camera, core::vector3df(30,30,30),core::vector3df(0,0,0),core::vector3df(0,50,0));
selector->drop();
camera->addAnimator(an);
an->drop();

you don't have selector, does you?
i think this isn't necessary.. maybe a mistake?

[spearfire]

i do have selector for my terrain
it works only when i add gravity it becomes a bit buggy somehow and it wants to go trough the floor of my building

[B@z]

i see..
it wasn't in the code, so didn't know...

i don't know the selector very well, but i think you shouldn't add 2 collision animators to one thing.
that's why there is the meta selector.

just add the "selector" to the "meta" and it will be all right i think. (just set the gravitation 0)

Code: Select all

meta->addTriangleSelector(selector); 
selector->drop();
scene::ISceneNodeAnimator* anim =
smgr->createCollisionResponseAnimator(meta, camera, core::vector3df(30,30,30),core::vector3df(0,0,0),core::vector3df(0,50,0));
meta->drop();
camera->addAnimator(anim);
anim->drop(); 

i think this should work ^^v

[spearfire]

i have got it fully working now.
first, the camera wanted to go trough the floor of my object
in my camera part i had the object collisions first and then the terrain collisions

i changed that so now i have the terrain collisions first and then the object collisions and it works without a problem now!

wel thank you all who helped me

[B@z]

i'm glad

i have a question too.
can i display the meta selector?

i have a problem with my collision. it goes throught the objects, but collide with air and so on
so i want to know where is my collision, and where isn't. (maybe it's just moved, not bad)
is there any method to display it?

EDIT:
it seems like i have some problems with my code, it isn't moved, but really bad
i'm using scaled models, maybe it's wrong?
do triangle selector supports scaled models?