C / C++ / MFC

2-Jun-13 22:30

Hi,
I want to know whether opcode can give me the messages besides triangle. As mesh which is defined in the opcode is consist of triangles, but most of my model is constructed using polygons, so before my collision qurey, I have to transform the polygons to triangles, but i want to know wether i could know which polygon the triangles detected are belong to. if the anwser is yes, how can i get the message?

Richard MacCutchan2-Jun-13 23:17

Richard MacCutchan

2-Jun-13 23:17

Henry Hong wrote:
how can i get the message?

How indeed! Perhaps you could start by explaining exactly what C/C++ problem you are trying to solve.

Use the best guess

Henry Hong3-Jun-13 15:55

3-Jun-13 15:55

Hello, as i want to use the OPCODE to perform collision detection,but according to the user manual, i can only get the vertex and normals that overlapped,so i want to know wether i can get the message about which polygon the vertex belong to. because that will be a important reason for me to decide wether use the OPCODE to perform my collision detection.

Richard MacCutchan3-Jun-13 20:52

Richard MacCutchan

3-Jun-13 20:52

Henry Hong wrote:
i want to use the OPCODE to perform collision detection

When I asked you to explain what your problem is I expected something more than a repeat of your original question. What do you mean by "OPCODE" and where is this collision detection supposed to take place?

Use the best guess

Henry Hong3-Jun-13 22:15

3-Jun-13 22:15

OPCODE is developed for collision detection in computer graphics, do you have the experience on it. And as I have no, and I am surveying about which manners can meet my request.

Richard MacCutchan3-Jun-13 22:22

Richard MacCutchan

3-Jun-13 22:22

See http://www.codercorner.com/Opcode.htm[^].

Use the best guess

Henry Hong3-Jun-13 22:35

3-Jun-13 22:35

I had got the resource from this address, and i also have read the mannual about the OPCODE, but as I want to learn some details about the OPCODE, I found it was difficult. And i had got the two projects "opcode" and "CDTestFramework" from that address. because i had not found the information about how to get which polygon the detected triangle is belong to in the user mannual. i hoped to find my anwser in the two projects above, but I find it was difficult to read the code in the two projects. if you had some experience about using OPCODE, i really wished you could give some suggestion about how to read the two projects. And as one of my request is two get the polygons, so if you know, can you tell me is there any manners i can get the polygons. If the answer is NO, i think I have to think about take us of other detection manners.

Thanks and Best Wishes.

image processing toolkits | batch image processing

C^hris L^osinger4-Jun-13 4:05

C^hris L^osinger

4-Jun-13 4:05

you might get better results if you ask this in the Algorithms or Graphics forums. this is a C/C++ forum, and your question doesn't seem to have anything to do with C/C++.

How to conditional call a library

thanh_bkhn2-Jun-13 19:00

2-Jun-13 19:00

Hi all,
I have a program that calls magnification.lib in windows 7, windows 8.
(I'm calling #include magnification.h)
But we know this library doesn't exist in windows XP.
How can I ignore this library when opening the application in windows XP?

«_Superman_»2-Jun-13 20:35

«_Superman_»

2-Jun-13 20:35

Create function pointers in a header file for all the magnification APIs that you're going to use.
Check the OS version and if Vista or above, call LoadLibrary on Magnification.dll.
After this call GetProcAddress on the function to initialize the function pointer.

So the header file could look like this -

typedef BOOL (*PFN_MAG_INITIALIZE)(void);

From the main program, you could have a call to some function called InitMagnification.

In the InitMagnification function, do the dynamic loading after checking the OS version.

PFN_MAG_INITIALIZE MagInitialize = NULL;

if (osVersion >= "VISTA")   // Consider this as pseudo-code
{
    HMODULE hmod = LoadLibrary(_T("Magnification.dll"));

    MagInitialize = GetProcAddress(hmod, "MagInitialize");
}

In the source where this function is called, do the checking as follows -

if (MagInitialize)
{
    MagInitalize();
}

I have omitted error checking, which you have to do.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++) (October 2009 - September 2013)

Polymorphism in C

thanh_bkhn3-Jun-13 16:05

3-Jun-13 16:05

Thank you very much. After posting this question, I did exactly what you told me to do. Thank you again

David Crow3-Jun-13 2:54

David Crow

3-Jun-13 2:54

thanh_bkhn wrote:

But we know this library doesn't exist in windows XP.
How can I ignore this library when opening the application in windows XP?

Sounds like you need to read up on implicit vs. explicit linking.

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thanh_bkhn3-Jun-13 16:06

3-Jun-13 16:06

Thank you. I performed an explicitly link to my DLL.

chaau3-Jun-13 18:28

chaau

3-Jun-13 18:28

As an alternative, you could use delay load dll. In this case you do not need to change the code you have already written (related to statically linking to the library), all you need to do is just do not call chunk of codes related to magnification at all. Saves you a lot of annoying LoadLibrary/GetProcAddress calls.

However, it looks like you have already implemented it. So, just learn about this, so that you could use in future

thanh_bkhn3-Jun-13 20:32