glPixelStorei(GL_UNPACK_ALIGNMENT,1);

glTexImage3D(GL_TEXTURE_3D,      // 3D texture
             0,                  // level 0 (for mipmapping)
             GL_LUMINANCE,       // pixel format of texture
             width,height,depth, // texture size
             0,                  // border size 0
             GL_LUMINANCE,       // pixel format of data supplied
             GL_UNSIGNED_BYTE,   // pixel storage type of data supplied
             volume);            // pointer to data chunk