OCTree problems...

This is a discussion on OCTree problems... within the C++ Programming forums, part of the General Programming Boards category; So im trying to implement an octree for a 3d world. But im having some issues with "new" and pointers. ...

  1. #1
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    OCTree problems...

    So im trying to implement an octree for a 3d world. But im having some issues with "new" and pointers.

    first problem is:
    i can make a tree and i can print the contents of each node to the screen, but then if i try to go through the tree looking for what node a certain point is it crashes.

    im using gcc v4. something on windows vista

    attached is the code for the tree.

    Any and all help is greatly appreciated.
    Attached Files Attached Files

  2. #2
    pwning noobs Zlatko's Avatar
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    Adam, if you provide me with a main program that creates the octree and reproduces the problem, I'll try to debug it. I need to be able to compile it, so I need VECTOR, TRIANGLE, and CVec3 (as far as I know).

    Best regards.

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    Ok here are the files. (AFAIK, they dont have anything special to link to...) TextureManager isnt needed.

    Thanks for your help.
    Attached Files Attached Files

  4. #4
    pwning noobs Zlatko's Avatar
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    Adam, the files in the last post don't compile.

    Code:
    1>Compiling...
    1>main.cpp
    1>octree\main.cpp(15) : error C2039: 'getTriangleList' : is not a member of 'C3DWorld'
    1>        octree\c3dworld.h(36) : see declaration of 'C3DWorld'
    1>C3DWorld.cpp
    1>octree\c3dworld.cpp(26) : error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)
    and there is no map.txt.

    I'll have a read through the OC tree code if I get some time.

    Good luck.

  5. #5
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    i didnt include map.txt cause i can only upload 5 files at a time. Not sure why its giving you that error, it doesnt on my computer.
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    Last edited by Adamkromm; 08-29-2009 at 07:53 PM.

  6. #6
    pwning noobs Zlatko's Avatar
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    Adam:
    One source of memory corruption is that you've copied OCTree.h into OCTree.cpp and then changed struct OCTreeNode. In OCTree.h, OCTreeNode has int* polys. In OCTree.cpp, it has int polys[50]. The mismatch in structure sizes has caused problems long before map.txt is even opened.

    In loadWorld, you define
    SECTOR* tsect[numsect];

    which is on the stack.
    It should be on the heap
    SECTOR* tsect = new SECTOR[numsect];

    I removed the OCTree.h contents from OCTree.cpp and defined OCTreeNode in OCTree.h with int polys[50] and I made the tsect on the heap.

    That allowed the program to run with no visible errors.

    I suppose you want to allocate polys on the heap, and the polys[50] was just for testing.

    Attached is the output. I did not try to interpret the output. It's up to you to check it.

    Best regards.
    Attached Files Attached Files
    Last edited by Zlatko; 08-31-2009 at 08:55 PM.

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