Run time error? WTF

[CuteAlien]

Well, first thing is to check if it actually loads. So check the pointer.
Then maybe load it in the editor just to check if the model works there.
And then start experimenting - scale it, place one every X steps, move it, move the camera nearer, further away, print a boundingbox around it, try what happens with another model, change the material settings .... whatever you can think off. Unless you start trying out what it's going on you can obviously not know it.

But don't ask 20 minutes after you solved one problem for people helping you with the next - you can't really have tried anything in that time. It is your code after all. We all work on our own.

[belva1234]

the mesch is created but i don't see it.. the function schootblock should create a block at the point of collision between the camera and the map but does not go and I do not think my mistake .. This is why I insist so much
THIS IS THE CODE

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scene::ISceneCollisionManager* collMan = smgr->getSceneCollisionManager();
 
        //da modificare la texture blocco in base all blocco che si e selezionato
     IAnimatedMesh *blocco=smgr->getMesh("../../media/blocco.3ds");
     IAnimatedMeshSceneNode *blocconode=smgr->addAnimatedMeshSceneNode(blocco);
    blocconode->setMaterialFlag(video::EMF_LIGHTING,false);
                core::line3d<f32> ray;
                ray.start = cam->getPosition();
                ray.end = ray.start + (cam->getTarget() - ray.start).normalize() * 1000.0f;
                core::vector3df intersection;
                core::triangle3df hitTriangle;
                scene::ISceneNode * selectedSceneNode =collMan->getSceneNodeAndCollisionPointFromRay(ray,intersection,hitTriangle ,-1, 0);
                        blocconode->setPosition(intersection);

Help me if you can pls and sorry for my insistence

[CuteAlien]

Use a debugger to see which values you get, that's what the debugger is there for.

[smso]

You should check whether collision has actually occur:

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scene::ISceneNode* selectedSceneNode =collMan->getSceneNodeAndCollisionPointFromRay(ray,intersection,hitTriangle ,-1, 0);
if (selectedSceneNode)
    blocconode->setPosition(intersection);
else
    printf("xxxxxx\n");
 

Secondly, have you set up the selector or meta?

Regards,
smso

[belva1234]

i've use triange selector

[belva1234]

i've use triange selector

If i use you metod appear xxxxxxxxxxxxx poop

[smso]

By setting up selector, I mean:

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selector = smgr->create...
terrain->setTriangleSelector(selector); // do NOT forget this

You could also try this:

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camera->updateAbsolutePosition();
core::line3df ray;
ray.start = camera->getAbsolutePosition();
ray.end = ray.start + (camera->getTarget() - ray.start).normalize()*1000000.0f; // make this large
...

Regards,
smso

[CuteAlien]

I think getSceneNodeAndCollisionPointFromRay does not need a triangle-selector.
But experiment - if your ray does not collide makes sure you can print it. For example put the ray in some buffer which is then printed when you press space. Write yourself some debug functions.

[belva1234]

FIRST OF ALL THANK YOU, IF I TRY AS YOU SAY YOU DO NOT CHANGE ANYTHING AND APPEAR ALWAYS XXXXXXX THE SELECTOR WITH THE MAP IS THIS:

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scene::ITriangleSelector* selector= smgr->createTerrainTriangleSelector(terrain, 0);
        terrain->setTriangleSelector(selector);

[CuteAlien]

Well, yes - it prints xxxx because you added the check to print that when it does not collide. Which means it does not collide. So now you have to figure out _why_ it does not collide. Most likely reason is that you put your ray is simply in the wrong position. Which is why I said you should write debug-functions to print out your ray so you can see where it really is.

[belva1234]

You say that I should show the coordinates of the block when it is created?

[CuteAlien]

Really up to you how to figure out what's going on. But when I debug such problems I always make sure I can see rays so I can see if they really collide or just point in the wrong direction or so. Check the functions in the videodriver for printing lines (you have to reset the world-transformation first when using them).

But you probably have to buffer the ray first (put it in some variable) as you don't see a ray that starts at the center of the camera and goes into the view direction (that's just 1 pixel in the center). So you put the ray in some buffer variable so you can still show it when you move around and see it from another angle.

[smso]

Try:

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

instead of:

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scene::ISceneNode* selectedSceneNode =collMan->getSceneNodeAndCollisionPointFromRay(ray,intersection,hitTriangle ,-1, 0)

;

You may use drawWayPoint() function to visualize the hit point:
http://irrlicht.sourceforge.net/forum/v ... =9&t=45212

Debugging is many times more difficult than writing program:)

Regards,
smso

[belva1234]

I have no funking idea I've tried everything.
Now i tray to display the cordinates who the cube is create