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Thread: Height field

  1. #1

    Height field

    Hi! I have a question about reading height field maps. I'm trying to make a terrain visualisation and put there some buildings, etc.

    I found quiet lot code samples how to make triangle strips, but I'm having problems with opening and reading the .bmp file. I'm coding in C++. If you have any good solutions, how to get pixels from file, I would realy appreciate it.

    Thanks in advance!

  2. #2

    Re: Height field

    hey piotr, kinda OT, but check this out:

    found this with a google for "load a bitmap", page 2

  3. #3

    Re: Height field

    I'm looking for some method to get the value of pixel color. The .bmp file should be in grey scale, and of course the darker pixel, the higher terrain. I worked out something like this, but it's not working:

    Code :
     void __fastcall TFormMain::SetupTextures()
        bitmap = new Graphics::TBitmap; //ladowane tylko raz
        for(int i = 0; i < 32; i++)
        	for(int j = 0; j < 32; j++)
                height_field[i][j][0]= float(i)*step;
                height_field[i][j][1]= (float)(bitmap->Canvas->Pixels[i][j])[(i*(AREA_SIZE+j)*3];
                height_field[i][j][2]= -float(i)*step;
    The line with Canvas is wrong, but I don't know how to make it work...

  4. #4
    Member Contributor
    Join Date
    Jul 2003

    Re: Height field

    Nehe has a source code to load .bmp, .gif and .jpg files with IPICTURE (under Windows).

    The code change the color of the pixels in order to convert rbg to rgb.

    You can use this example to find the color of a pixel.

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