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What the flying F##K is 1.4013e-044 ???

Discussion in 'C /C ++' started by mjohansson, Sep 1, 2016.

  1. mjohansson

    mjohansson Supporter

    Joined:
    Feb 10, 2011
    Messages:
    409
    So the only clue I could find by googling was something like an interpretation of a value of different type?
    The problem I have is beyond my ability to comprehend, my description of what is happening is:

    read float array data and write to float array in a loop, print out the value of the array I copied into and its allright, after loop print out same value in same array I copied into and the first couple of elements have value 1.4013e-044, after that the following elements are ok...

    HOW CAN THAT HAPPEN? Nothing happens after the loop that neither reads or writes the array, its texture coordinates and I saw the error visually in my program first, and traced it back to the loading function were it reads the coordinates from file into an array, and then copies data from that array into a new one to get a different order. Ive used same code in the past and never encountered this before, does anyone know anything about the 1.4013e-044 corruption and can have a guess at something that could happen?

    I thaught mayby something happened in the loop to get back to first elements by mistake and mess with the data, but I checked carefully, its literally all ok inside of loop and next line after loop the data is corrupted.
    --- Double Post Merged, Sep 1, 2016, Original Post Date: Sep 1, 2016 ---
    If I offset the use of the array, like add 30 to the elements xxx[x+30] then it works, its a few elements in the beginning of array that gets autocorrupted after a loop has finnished writing to them, theyre ok inside of loop but directly after it theyre nolonger ok, and nothing happens inbetween... This just drives me insane, and how could I trust it not to happen worse in the future?
     
    Tags:
  2. ptitSeb

    ptitSeb Serial Porter

    Joined:
    Aug 15, 2012
    Messages:
    7,698
    Location:
    France, near Lyon
    It will be easier with some code....
     
  3. Linux-SWAT

    Linux-SWAT Advanced Member

    Joined:
    Feb 13, 2010
    Messages:
    7,912
    Isn't it the index that goes too far ?
    Indeed, should help with a bit of code ;^) .
     
  4. mjohansson

    mjohansson Supporter

    Joined:
    Feb 10, 2011
    Messages:
    409
    Ill try and see if I can cut out the code and have it repeat, its a rather big code and I would rather not put iyt on the internet for various reasons, not now anyway, Im thinking it ought to be to little memory reserved or to much in total or something like that, but Ill see if I can repeat it in a small contained code later tonight.
     
  5. ptitSeb

    ptitSeb Serial Porter

    Joined:
    Aug 15, 2012
    Messages:
    7,698
    Location:
    France, near Lyon
    what you try, at least, is to print the weird value as Int in Hexa. That may give you hint of what goes wrong.
     
  6. mjohansson

    mjohansson Supporter

    Joined:
    Feb 10, 2011
    Messages:
    409
    I cut out the code and the effect repeats here, check this code:
    Code:
    #include "GL/glew.h"
    #include <iostream>
    #include "fstream"
    #include "math.h"
    #include <stdio.h>
    #include <string.h>
    
    const int sgNumberOfObjects=200;
    const int sgNumberOfPolygons=9000;
    const int sgNumberOfBones=45;
    const int sgNumberOfTextures=8;
    const int sgNumberOfTexturesAnimation=15;
    const int sgNumberOfAnimations=100;
    const int sgNumberOfFrames=10;
    const int sgNumberOfDataTextures=7;
    char sgFileName[sgNumberOfObjects][99];
    char sgTexName[(sgNumberOfObjects*sgNumberOfTextures*sgNumberOfTexturesAnimation)+
      sgNumberOfDataTextures][99];
    static float sgRv[sgNumberOfPolygons*9*2];// VERTICES.
    static float sgRc[sgNumberOfPolygons*12*2];// COLOR.
    static float sgRt[sgNumberOfPolygons*6*2];// TEXTURE COORDINATES.
    
    class sgObject{
    public:
      int animation_number_of_animations;
      int animation_number_of_frames[sgNumberOfAnimations];
      int animate;
      int animation_select;
      int animation_completed;// IS SET TO 1 IF AN ANIMATION SEQUENCE HAS PLAYED THROUGH.
      float animation_time;
      float animation_lenght[sgNumberOfAnimations];
      float animation_frametime[sgNumberOfAnimations][sgNumberOfFrames];
      float animation_angle[sgNumberOfAnimations][sgNumberOfFrames][sgNumberOfBones][3];
      float animation_speed;// 1.0 = NORMAL TIME, <1.0 = SLOWMOTION, >1.0 FASTFORWARD.
      float animation_offset[sgNumberOfAnimations][sgNumberOfFrames][3];
    
      int skeleton_number_of_bones;
      int skeleton_selected_bone;
      int skeleton_parent[sgNumberOfBones];
      int skeleton_parent_heritage[sgNumberOfBones][sgNumberOfBones];
      int skeleton_curve[sgNumberOfBones];
      float skeleton_angle_in[sgNumberOfBones][3];// INPUT ANGLES (USE THIS FOR DYNAMIC ANIMATION).
      float skeleton_angle[sgNumberOfBones][3];
      float skeleton_angle_pose[sgNumberOfBones][3];
      float skeleton_reference[sgNumberOfBones][3];
      float skeleton_pose[sgNumberOfBones][3];
      float skeleton_pose_c[3][sgNumberOfBones][3];
      float skeleton_offset[3];
    
      int vertice_number_of_polygons;
      int vertice_link[sgNumberOfPolygons*3];
      int vertice_child[sgNumberOfPolygons*3];
      int vertice_sorted_chunk[sgNumberOfBones+2];
      float vertice_weight[sgNumberOfPolygons*3];
      float vertice_reference[sgNumberOfPolygons*3][3];
      float vertice_pose[sgNumberOfPolygons*3][3];
      float vertice_pose_c[3][sgNumberOfPolygons*3][3];
      float *vertice_sorted[sgNumberOfPolygons*3];
    
      int texture_number_of_textures;
      int texture_number_of_frames[sgNumberOfTextures];
      int texture_link[sgNumberOfTextures];
      int texture_select[sgNumberOfTextures];
      int texture_framerate[sgNumberOfTextures];
      float texture_time[sgNumberOfTextures];
      float texture_lenght[sgNumberOfTextures];
      float texture_coordinate[sgNumberOfPolygons*3][2];
      GLuint texture[sgNumberOfTextures][sgNumberOfTexturesAnimation];
      GLuint tex_s[sgNumberOfTextures][sgNumberOfTexturesAnimation];
      GLuint tex_e[sgNumberOfTextures][sgNumberOfTexturesAnimation];
      GLuint tex_n[sgNumberOfTextures][sgNumberOfTexturesAnimation];
    
      int attach;
      int attach_object;// ATTACH TO THIS OBJECT (NUMBER IN ARRAY).
      int attached;
      int attach_bone;// ATTACH TO THIS BONE IN THE HOSTING OBJECT.
      float attach_offset_position[3];
      float attach_offset_angle[3];
      sgObject *attach_adress;
    
      int render;
      int render_surface;
      int render_mesh;// 0 = NO, 1 = YES (WITH DEPTHTEST), 2 = YES (WITHOUT DEPTHTEST).
      int render_skeleton;
      float position[3];
      float position_old[3];
      float color[4];
      float angle[3];
      float last_position[3];
      float last_angle[3];
    };
    
    sgObject object[sgNumberOfObjects];int sgSo=0;
    #define o object
    
    int offset=0;
    
    void sgLOAD_OBJ(int object_id,int data_id){
    int c=0,d=0,e=0,f=0,g=0,t=0,tex_val=-1,r=0;char lr[200];FILE * file;
    float rv[sgNumberOfPolygons*9];
    float rtc[sgNumberOfPolygons*6];
    int rf[sgNumberOfPolygons*3];
    int rt[sgNumberOfPolygons*3];
    int rtv[sgNumberOfPolygons+1];
    file=fopen(sgFileName[data_id],"r");while(1){r=fscanf(file,"%s",lr);if(r==EOF)break;
    if(strcmp(lr,"usemtl")==0){tex_val+=1;}
    if(strcmp(lr,"v")==0){fscanf(file,"%f %f %f\n",&rv[d+0],&rv[d+1],&rv[d+2]);d+=3;
    if(d>=sgNumberOfPolygons*3){d=0;}}
    if(strcmp(lr,"vt")==0){fscanf(file,"%f %f\n",&rtc[e+0],&rtc[e+1]);e+=2;
    if(e>=sgNumberOfPolygons*2){e=0;}}
    if(strcmp(lr,"f")==0){fscanf(file,"%d/%d %d/%d %d/%d\n",
      &rf[f+0],&rt[f+0],&rf[f+1],&rt[f+1],&rf[f+2],&rt[f+2]);rtv[c]=tex_val;
    c+=1;f+=3;if(c>=sgNumberOfPolygons){c=0;f=0;}g+=1;}}rtv[g]=tex_val+1;c=0;d=0;e=0;f=0;fclose(file);
    //std::cout<<sgFileName[data_id]<<std::endl;
    //std::cout<<g<<std::endl;
    if(g<sgNumberOfPolygons){
    o[object_id].animation_number_of_animations=0;
    o[object_id].animate=1;
    o[object_id].animation_select=0;
    o[object_id].animation_completed=0;
    o[object_id].animation_time=0.0f;
    for(int i=0;i<sgNumberOfAnimations;i++){
    o[object_id].animation_number_of_frames[I]=0;
    o[object_id].animation_lenght[I]=0.0f;
    for(int j=0;j<sgNumberOfFrames;j++){
    o[object_id].animation_offset[I][j][0]=0.0f;
    o[object_id].animation_offset[I][j][1]=0.0f;
    o[object_id].animation_offset[I][j][2]=0.0f;
    o[object_id].animation_frametime[I][j]=0.0f;
      for(int k=0;k<sgNumberOfBones;k++){
      o[object_id].animation_angle[I][j][k][0]=0.0f;
      o[object_id].animation_angle[I][j][k][1]=0.0f;
      o[object_id].animation_angle[I][j][k][2]=0.0f;}}}
    o[object_id].animation_speed=1.0f;
    o[object_id].skeleton_number_of_bones=0;
    o[object_id].skeleton_selected_bone=0;
    o[object_id].skeleton_offset[0]=0.0f;
    o[object_id].skeleton_offset[1]=0.0f;
    o[object_id].skeleton_offset[2]=0.0f;
    for(int i=0;i<sgNumberOfBones;i++){
    o[object_id].skeleton_parent[I]=0;
    o[object_id].skeleton_angle[I][0]=0.0f;
    o[object_id].skeleton_angle[I][1]=0.0f;
    o[object_id].skeleton_angle[I][2]=0.0f;
    o[object_id].skeleton_angle_pose[I][0]=0.0f;
    o[object_id].skeleton_angle_pose[I][1]=0.0f;
    o[object_id].skeleton_angle_pose[I][2]=0.0f;
    o[object_id].skeleton_reference[I][0]=0.0f;
    o[object_id].skeleton_reference[I][1]=0.0f;
    o[object_id].skeleton_reference[I][2]=0.0f;
    o[object_id].skeleton_pose[I][0]=0.0f;
    o[object_id].skeleton_pose[i][1]=0.0f;
    o[object_id].skeleton_pose[i][2]=0.0f;
    o[object_id].skeleton_pose_c[0][i][0]=0.0f;
    o[object_id].skeleton_pose_c[0][i][1]=0.0f;
    o[object_id].skeleton_pose_c[0][i][2]=0.0f;
    o[object_id].skeleton_pose_c[1][i][0]=0.0f;
    o[object_id].skeleton_pose_c[1][i][1]=0.0f;
    o[object_id].skeleton_pose_c[1][i][2]=0.0f;
    o[object_id].skeleton_pose_c[2][i][0]=0.0f;
    o[object_id].skeleton_pose_c[2][i][1]=0.0f;
    o[object_id].skeleton_pose_c[2][i][2]=0.0f;
    o[object_id].skeleton_curve[i]=0;
    o[object_id].skeleton_angle_in[i][0]=0.0f;
    o[object_id].skeleton_angle_in[i][1]=0.0f;
    o[object_id].skeleton_angle_in[i][2]=0.0f;
    for(int j=0;j<sgNumberOfBones;j++){
      o[object_id].skeleton_parent_heritage[i][j]=0;}}
    o[object_id].vertice_number_of_polygons=g;
    for(int i=0;i<sgNumberOfBones+2;i++){
    o[object_id].vertice_sorted_chunk[i]=0;}
    for(int i=0;i<sgNumberOfPolygons*3;i++){
    o[object_id].vertice_link[i]=0;
    o[object_id].vertice_child[i]=0;
    o[object_id].vertice_weight[i]=0.0f;
    o[object_id].vertice_reference[i][0]=0.0f;
    o[object_id].vertice_reference[i][1]=0.0f;
    o[object_id].vertice_reference[i][2]=0.0f;
    o[object_id].vertice_pose_c[0][i][0]=0.0f;
    o[object_id].vertice_pose_c[0][i][1]=0.0f;
    o[object_id].vertice_pose_c[0][i][2]=0.0f;
    o[object_id].vertice_pose_c[1][i][0]=0.0f;
    o[object_id].vertice_pose_c[1][i][1]=0.0f;
    o[object_id].vertice_pose_c[1][i][2]=0.0f;
    o[object_id].vertice_pose_c[2][i][0]=0.0f;
    o[object_id].vertice_pose_c[2][i][1]=0.0f;
    o[object_id].vertice_pose_c[2][i][2]=0.0f;
    o[object_id].vertice_pose[i][0]=0.0f;
    o[object_id].vertice_pose[i][1]=0.0f;
    o[object_id].vertice_pose[i][2]=0.0f;}
    o[object_id].attach=0;
    o[object_id].attach_object=0;
    o[object_id].attached=0;
    o[object_id].attach_bone=0;
    o[object_id].attach_offset_position[0]=0.0f;
    o[object_id].attach_offset_position[1]=0.0f;
    o[object_id].attach_offset_position[2]=0.0f;
    o[object_id].attach_offset_angle[0]=0.0f;
    o[object_id].attach_offset_angle[1]=0.0f;
    o[object_id].attach_offset_angle[2]=0.0f;
    o[object_id].attach_adress=NULL;
    o[object_id].render=1;
    o[object_id].render_surface=1;
    o[object_id].render_mesh=1;
    o[object_id].render_skeleton=0;
    o[object_id].position[0]=0.0f;
    o[object_id].position[1]=0.0f;
    o[object_id].position[2]=0.0f;
    o[object_id].color[0]=1.0f;
    o[object_id].color[1]=1.0f;
    o[object_id].color[2]=1.0f;
    o[object_id].color[3]=1.0f;
    o[object_id].angle[0]=0.0f;
    o[object_id].angle[1]=0.0f;
    o[object_id].angle[2]=0.0f;
    o[object_id].texture_link[0]=0;
    while(c<o[object_id].vertice_number_of_polygons){
    o[object_id].vertice_reference[d+0][0]=rv[(rf[d+0]*3)-3];
    o[object_id].vertice_reference[d+0][1]=rv[(rf[d+0]*3)-2];
    o[object_id].vertice_reference[d+0][2]=rv[(rf[d+0]*3)-1];
    o[object_id].vertice_reference[d+1][0]=rv[(rf[d+1]*3)-3];
    o[object_id].vertice_reference[d+1][1]=rv[(rf[d+1]*3)-2];
    o[object_id].vertice_reference[d+1][2]=rv[(rf[d+1]*3)-1];
    o[object_id].vertice_reference[d+2][0]=rv[(rf[d+2]*3)-3];
    o[object_id].vertice_reference[d+2][1]=rv[(rf[d+2]*3)-2];
    o[object_id].vertice_reference[d+2][2]=rv[(rf[d+2]*3)-1];
    o[object_id].texture_coordinate[d+0+30][0]=rtc[(rt[d+0]*2)-2];
    o[object_id].texture_coordinate[d+0+30][1]=rtc[(rt[d+0]*2)-1]*-1.0f;
    o[object_id].texture_coordinate[d+1+30][0]=rtc[(rt[d+1]*2)-2];
    o[object_id].texture_coordinate[d+1+30][1]=rtc[(rt[d+1]*2)-1]*-1.0f;
    o[object_id].texture_coordinate[d+2+30][0]=rtc[(rt[d+2]*2)-2];
    o[object_id].texture_coordinate[d+2+30][1]=rtc[(rt[d+2]*2)-1]*-1.0f;
    o[object_id].texture_link[rtv[c]+1]=c+1;
    o[object_id].texture_number_of_textures=rtv[c]+1;
    o[object_id].texture_framerate[c]=10;
    /*std::cout<<c<<"  "<<o[object_id].texture_coordinate[d+0+offset][0]<<"  "<<
      o[object_id].texture_coordinate[d+0+offset][1]<<std::endl;
    std::cout<<c<<"  "<<o[object_id].texture_coordinate[d+1+offset][0]<<"  "<<
      o[object_id].texture_coordinate[d+1+offset][1]<<std::endl;
    std::cout<<c<<"  "<<o[object_id].texture_coordinate[d+2+offset][0]<<"  "<<
      o[object_id].texture_coordinate[d+2+offset][1]<<std::endl;*/
    c+=1;d+=3;}
    
    c=0;d=0;while(c<o[object_id].vertice_number_of_polygons){
    std::cout<<c<<"  "<<o[object_id].texture_coordinate[d+0+offset][0]<<"  "<<
      o[object_id].texture_coordinate[d+0+offset][1]<<std::endl;
    std::cout<<c<<"  "<<o[object_id].texture_coordinate[d+1+offset][0]<<"  "<<
      o[object_id].texture_coordinate[d+1+offset][1]<<std::endl;
    std::cout<<c<<"  "<<o[object_id].texture_coordinate[d+2+offset][0]<<"  "<<
      o[object_id].texture_coordinate[d+2+offset][1]<<std::endl;
    c+=1;d+=3;}
    for(int i=0;i<o[object_id].texture_number_of_textures;i++){
    o[object_id].texture_lenght[i]=
    o[object_id].texture_number_of_frames[i]*
    (1.0f/(float)o[object_id].texture_framerate[i]);
    }
    }else{
    }
    }
    
    
    
    int main(int argc,char **argv){
    strncpy(sgFileName[0],"./temp/testf.obj",50);
    sgLOAD_OBJ(0,0);
    
    return 0;}
    and here is the file I use uploaded, testf.obj, you need GLEW lib and create the temp directory or edit the sgFileName to were you put the file if you want to compile and test it.[/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/I][/code]
    --- Double Post Merged, Sep 1, 2016, Original Post Date: Sep 1, 2016 ---
    THESE are the lines were the evil happens?

    while(c<o[object_id].vertice_number_of_polygons){
    o[object_id].vertice_reference[d+0][0]=rv[(rf[d+0]*3)-3];
    o[object_id].vertice_reference[d+0][1]=rv[(rf[d+0]*3)-2];
    o[object_id].vertice_reference[d+0][2]=rv[(rf[d+0]*3)-1];
    o[object_id].vertice_reference[d+1][0]=rv[(rf[d+1]*3)-3];
    o[object_id].vertice_reference[d+1][1]=rv[(rf[d+1]*3)-2];
    o[object_id].vertice_reference[d+1][2]=rv[(rf[d+1]*3)-1];
    o[object_id].vertice_reference[d+2][0]=rv[(rf[d+2]*3)-3];
    o[object_id].vertice_reference[d+2][1]=rv[(rf[d+2]*3)-2];
    o[object_id].vertice_reference[d+2][2]=rv[(rf[d+2]*3)-1];
    o[object_id].texture_coordinate[d+0+30][0]=rtc[(rt[d+0]*2)-2];
    o[object_id].texture_coordinate[d+0+30][1]=rtc[(rt[d+0]*2)-1]*-1.0f;
    o[object_id].texture_coordinate[d+1+30][0]=rtc[(rt[d+1]*2)-2];
    o[object_id].texture_coordinate[d+1+30][1]=rtc[(rt[d+1]*2)-1]*-1.0f;
    o[object_id].texture_coordinate[d+2+30][0]=rtc[(rt[d+2]*2)-2];
    o[object_id].texture_coordinate[d+2+30][1]=rtc[(rt[d+2]*2)-1]*-1.0f;
    --- Double Post Merged, Sep 1, 2016 ---
    Actually you dont need GLEW just normal GL I think, just for the GLuint variables if that would matter in the grand scheme of things...
    --- Double Post Merged, Sep 1, 2016 ---
    Oh wow, I forgot to change from my old manual offset in the loop, instead of texture_coordinate[d+0+30] change to [d+0+offset], and then you can sett the offset manually more easily, but it reveals one thing, the 1.4013e-044 value is set in the first couple of elements before already if I dont write to them, but why would they report my real value when I print out inside the loop, but then revert back again as ssoon as loop iis done? That makes no sense to me.
     

    Attached Files:

  7. JonnyH

    JonnyH Member

    Joined:
    Aug 9, 2014
    Messages:
    78
    Location:
    PowerVR
    For a start:
    o[object_id].texture_framerate[c] = 10;

    is going over the array of texture_framerate, it's defined as [8] large, but c >=8 for a number of loops.

    And "1.4013e-44" is the hex value 0xa when interpreted as a floating point... which is '10' in integer space :)
     
    _jr_, FlapJack and levi like this.
  8. mjohansson

    mjohansson Supporter

    Joined:
    Feb 10, 2011
    Messages:
    409
    Oh crap, thats embarecing, so it wasnt so mysterious afterall, Ive never had quite something like this happen before and I dont know hex either, well a thousand thanks for taking the time to check it!!
     

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