Help with collisions via Rays [SOLVED]

[sephoroph]

Alright guys i need help getting rays to work.

First and foremost i did use the 'search button' and did not find anything to help me.. many examples but nothing that helped

I'm trying to get collision detection with my terrain which is a obj mesh thrown into a coppercube scene and then exported to .irr

Here is a cube and the terrain i'm trying to cast a ray to:



I am trying to cast a ray from a cube on the map to 9,000 units below the the cube and praying that it hits the terrain

Here is the code of me initializing the cube

Code: Select all

IAnimatedMesh* cube = smgr->getMesh("../media/cube.obj");
if (!cube)
{
	device->drop();
}
p = smgr->addAnimatedMeshSceneNode(cube);

Here is the code initializing the terrian

Code: Select all

smgr->loadScene("../media/scene.irr");

	core::array<scene::ISceneNode *> nodes;
	smgr->getSceneNodesFromType(scene::ESNT_ANY, nodes); // Find all nodes
	scene::IMetaTriangleSelector * meta = smgr->createMetaTriangleSelector();
	for (u32 i=0; i < nodes.size(); ++i)
	{
		scene::ISceneNode * node = nodes[i];
		scene::ITriangleSelector * selector = 0;

		switch(node->getType())
		{
		case scene::ESNT_CUBE:
		case scene::ESNT_ANIMATED_MESH:
			// Because the selector won't animate with the mesh,
			// and is only being used for camera collision, we'll just use an approximate
			// bounding box instead of ((scene::IAnimatedMeshSceneNode*)node)->getMesh(0)
			selector = smgr->createTriangleSelectorFromBoundingBox(node);
		break;

		case scene::ESNT_MESH:
		case scene::ESNT_SPHERE: // Derived from IMeshSceneNode
			selector = smgr->createTriangleSelector(((scene::IMeshSceneNode*)node)->getMesh(), node);
			break;

		case scene::ESNT_TERRAIN:
			selector = smgr->createTerrainTriangleSelector((scene::ITerrainSceneNode*)node);
			break;

		case scene::ESNT_OCTREE:
			selector = smgr->createOctreeTriangleSelector(((scene::IMeshSceneNode*)node)->getMesh(), node);
			break;

		default:
			// Don't create a selector for this node type
			break;
		}

		if(selector)
		{
			// Add it to the meta selector, which will take a reference to it
			meta->addTriangleSelector(selector);
			// And drop my reference to it, so that the meta selector owns it.
			selector->drop();
		}
	}

And here is the collision detection i was trying to set up:

Code: Select all

core::line3d<f32> ray;
vector3df pos;
vector3df pos2;
pos  = p->getPosition();
pos2 = p->getPosition();
pos2.Y-=9000;
	
ray.start =pos;
ray.end = pos2;
vector3df a;
ray.getClosestPoint(a);
	
core::vector3df intersection;
core::triangle3df hitTriangle;

scene::ISceneNode * selectedSceneNode =
collMan->getSceneNodeAndCollisionPointFromRay(ray,intersection,hitTriangle);

after the call to the collision manager collMan intersection = (0,0,0)
and ray.getClosestPoint the a = 0,0,0


I am confused on why my ray is not picking up anything on the terrain..

If you need more information to help me solve this just let me know.

Thanks in advance

[nespa]

where is SetTriangleSelector?

Code: Select all

Node->setTriangleSelector(selector);

to bind the selector to your node, then drop the selector

see Collision example 07

[/code]

[sephoroph]

Sick poop Nespa, I think it worked. I owe you big time haha