Messages

1

Projects / Re: ambient occlusion

« on: August 05, 2011 »

  OMG yes it is working. If I do like you posted in the pic. I was using , in same line but now it works.

Thanks  It is a cool program by the author taj 

2

Projects / Re: ambient occlusion

« on: August 04, 2011 »

Thanks for reply 

I tried adding those lib in linker->input->additionaldirectories but now it gives me LNK 1104 cannot open opengl32.lib, glu32.lib, winmm.lib. I added header and lib in VC++ directories. Also added lib location of opengl32.lib, glu32.lib. glaux.lib in linker->general_>additional lib directories but it makes no difference so I removed it.

I changed charcter set to no set as you suggested it was at default to use multi-byte character set.  I guess that is ok.

BTW this is exact same code from the author. Not sure why the program is not working. I open a new project in VS 2010 VC++, general, empty project and try to compile but it refuses to work   

Code: [Select]

#include <windows.h>
#include <math.h>

#include <GL/gl.h>
#include <GL/glu.h>


#if defined(__cplusplus)
    extern "C" {
#endif
int _fltused;
#if defined(__cplusplus)
    };
#endif



//max number is 7, we must reserve one light for plane
// opengl supports 8 lights
#define NLIGHTS 7

static const GLfloat white[] = { 1.0f, 1.0f, 1.0f, 1.0f };
static const GLfloat black[] = { 0.0f, 0.0f, 0.0f, 1.0f }; //doubles as position of lights
static const GLfloat darklight[] = { -2.0f, -2.0f, -2.0f, 2.0f };
static GLUquadricObj *q;

long startTime;
float time;

void setup()
{
int i;
   q = gluNewQuadric ();
   gluQuadricNormals (q,GLU_SMOOTH);

   glColorMaterial (GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
   glEnable(GL_COLOR_MATERIAL);
   // everything in the scene will receive white ambient light
   glLightModelfv(GL_LIGHT_MODEL_AMBIENT, white);

  //setup all opengl lights to be "ambient occlusion" lights.
  for (i=0;i<8; i++)
  {
glLightfv(GL_LIGHT0+i,GL_AMBIENT,black);
    glLightfv(GL_LIGHT0+i,GL_SPECULAR,black);
        // yo the secret sauce...
        // lights are set with NEGATIVE colour!
    glLightfv(GL_LIGHT0+i,GL_DIFFUSE,darklight);
        // a quadratic falloff of light power is used
    // attenuation is 1/(constant + linear*dist + quadratic*dist)
    glLightf(GL_LIGHT0+i, GL_CONSTANT_ATTENUATION,  1.0f);//so intersecting spheres look right
    glLightf(GL_LIGHT0+i, GL_LINEAR_ATTENUATION,  0.0f);
    glLightf(GL_LIGHT0+i, GL_QUADRATIC_ATTENUATION,  2.0f); //physically correct would be 1.0, but it looks bad :-)
  }

  // enable all sphere lights
  for (i=0;i<NLIGHTS;i++) glEnable (GL_LIGHT0+i);
  // now the plane light needs differnt attenuation factors...
  glLightf(GL_LIGHT7, GL_CONSTANT_ATTENUATION,  0.0f);//touch the plane and its black
  glLightf(GL_LIGHT7, GL_LINEAR_ATTENUATION,  1.0f);
  glLightf(GL_LIGHT7, GL_QUADRATIC_ATTENUATION,  0.0f);
  // enable plane light
  glEnable (GL_LIGHT7);

  glEnable(GL_LIGHTING);
  glEnable(GL_DEPTH_TEST);

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(60.0f,1.0f,0.1f,100.0f);
  gluLookAt(0,0,-10.0f, 0,0,0, 0,1,0);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  time =0;
}

void moveSpheres(int val)
{
glRotatef(time*0.4f,1,1,1);
glRotatef(val*time,val,5,3);
glTranslatef(sinf(val+time*0.1f)*4.0f,0,0);
}

void moveGroundLight(int val)
{
    glTranslatef(0,-6.0f,0);
glScalef(1.0f,0.0f,1.0f);
moveSpheres(val);
}

void drawGround()
{
   // draw GROUND plane
   glLoadIdentity();
   glTranslatef(0.0f,-5.0f,0.0f);
   glRotatef (-90,1,0,0);
   glColor4f (1.0f,1.0f,0.9f,1.0f);
   // disable the ground light as it should not occlude itself
   glDisable (GL_LIGHT7);
   gluDisk(q,0.0f,20.0f,60,60);
   glEnable (GL_LIGHT7);
}

void drawAOSpheres()
{
int i;
   // set the lights in position
   for (i=0; i<NLIGHTS; i++)
   {
    glLoadIdentity();
moveSpheres(i);
// black is 0,0,0,1, which are the values we need for
// a point light at the origin.
glLightfv (GL_LIGHT0+i, GL_POSITION, black);
   }

   // draw the spheres being careful not to draw a sphere occluding itself
   for (i=0;i<NLIGHTS; i++)
   {
     
// simulate a plane by always placing a light under the sphere on the plane
     glLoadIdentity();
moveGroundLight(i);
glLightfv (GL_LIGHT7, GL_POSITION, black);
     // a sphere should not occlude itself so switch off its own light
glDisable (GL_LIGHT0+i);
glColor4f (1.0f-(i/20.0f),0.7f+(i/20.0f),1.0f,1.0f);
glLoadIdentity();
moveSpheres(i);
gluSphere (q,1,30,30);
     glEnable (GL_LIGHT0+i);
   }
}



int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{             
PIXELFORMATDESCRIPTOR pfd;
HDC hDC;

pfd.cColorBits = pfd.cDepthBits = 32;
pfd.dwFlags    = PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
hDC = GetDC ( CreateWindow("edit", 0,
WS_POPUP|WS_VISIBLE,
100, 100, 640 , 480, 0, 0, 0, 0) );         
SetPixelFormat ( hDC, ChoosePixelFormat ( hDC, &pfd) , &pfd );
wglMakeCurrent ( hDC, wglCreateContext(hDC) );

ShowCursor(FALSE);
glClearColor(1.0f,1.0f,1.0f,1.0f);
       setup();
       startTime = timeGetTime();
do {
glClear ( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
                time = (timeGetTime() - startTime) *0.006f;
drawAOSpheres();
drawGround();
SwapBuffers ( hDC );
} while ( !GetAsyncKeyState(VK_ESCAPE) );
ExitProcess(0);
}



3

Projects / ambient occlusion

« on: August 03, 2011 »

Hi all,

I cam across this thread of ambient occlusion without using shaders. Although the author has given code for it I am not able to sucessfully compile and run the program in visual studio 2010. I am getting error LNK2019.

Have anyone of you got it working  and know how to implement it ?

http://www.dbfinteractive.com/forum/index.php?topic=2117.0

Please help