🔒 Locked

Height mapping problems.

Started by Mithoric Jul 2, 2004 at 12:11 PM 1 reply 650+ views

Original Post

Jul 2, 2004 at 12:11 PM

Ok I've never height mapped beofore .. I've read the NeHe tutorials plus quite a few others and searched the forums a bit but I can't seem to get my height mapper working correctly. I'm trying to load from a raw file and then generate the terrain into a display list.


FILE *pFile = NULL;
	pFile = fopen( filename, "rb" );
    
    this->HeightMap = (float*)malloc( sizeof( float ) * ( width * height ) );
    
    if( this->HeightMap == NULL ) {
        MessageBox( NULL, "Unable to allocate memory!", "Error", MB_OK );
        return false;
    }    
    
	if ( pFile == NULL ) {
		MessageBox(NULL, "Can't Find The Height Map!", "Error", MB_OK);
		return false;
	}

	fread( this->HeightMap, 1, width*height, pFile );

	int result = ferror( pFile );
	if (result)	{
		MessageBox(NULL, "Failed To Get Data!", "Error", MB_OK);
		return false;
	}
	fclose(pFile);
	
	this->List = glGenLists( 1 );
    glNewList( this->List, GL_COMPILE );
    
    for( int z = 0; z < height; z++ ) {
      glBegin( GL_TRIANGLE_STRIP );
      for( int x = 0; x < width; x++ ) {
        glVertex3f( x * step, 1.0f, z * step );
        glVertex3f( x * step, 1.0f/this->HeightMap[ z + ( x * width ) ], z * step + step );
        glVertex3f( x * step + step, 1.0f/this->HeightMap[ z + ( x * width ) ], z * step  + step );
        glVertex3f( x * step + step, 1.0f, z * step );
        glVertex3f( x * step, 1.0f, z * step );
      }
      glEnd();
    }
    
    glEndList();

I'm pretty sure my tstrips are right, but for some reason I am getting massive heights on every strip.

VolkerG

Jul 2, 2004 at 12:14 PM

Why are you using the reciprocal of the height value? You get infinity for each height value of 0.

Mithoric

Author

Mithoric

Jul 2, 2004 at 12:21 PM

Doh, didn't realise that. I am still not getting the height mapped properly though. I figure I'm just not putting the height values in the right spot.

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.