void aperfil_01(float *band, int stride, int icount, float filter)
{
	float v=band[0];
	int j = stride;
	int i;
	for(i=0;i < icount-1;i++)
	{
		band[j]=((filter*v)+((1-filter)*band[j]));
		v=band[j];
		j+=stride;
	}
}
float **fault_formation_f(int width,int height,int low,int high,int iterations,float filter)
{
	float **points=new float*[width];
	for(int i=0;i < width;i++)
	{
		points=new float[height];
	}
	for(int ax=0;ax < width;ax++)
	{
		for(int ay=0;ay<height;ay++)
		{
			points[ax][ay]=0;
		}
	}

	int ix;
	int iy;
	int totiterations=iterations;
	
	while(iterations > 0)
	{
		int ttheight=high-((high-low)*iterations)/totiterations;
		int randx1,randy1,randx2,randy2;
		randx1=rangerand(0,width);
		randx2=rangerand(0,width);
		randy1=rangerand(0,height);
		randy2=rangerand(0,height);

		int dirx1,diry1,dirx2,diry2;
		dirx1=randx2-randx1;
		diry1=randy2-randy1;

		for(ix=0;ix < width;ix++)
		{
			for(iy=0;iy < height;iy++)
			{
				dirx2=ix-randx1;
				diry2=iy-randy1;
				if((dirx2*diry1 - dirx1*diry2) > 0)
				{
					points[ix][iy]=ttheight+points[ix][iy];
				}
			}
		}
		iterations–;
	}
	return points;
}
  </pre>  

basically, the above is an implementation of the fault line formation method of generation terrain. That first function there is the erosion function… Supposedly, after each fault is placed, you're supposed to filter the entire map 4 times, &#111;ne per direction (north, south, east, west)

thats top to bottom, bottom to top, left to right, right to left

im not sure &#111;n how to do this, i think ive got top to bottom and bottom to top correct, it goes something like

aperfil_01(points[ix],1,128,0.4f);
aperfil_01(points[width-1-ix],1,128,0.4f);

where ix is a number going from 0 to 127, and width is 128

it doesnt like me guys, im telling you, i dont know how to go left to right or right to left…

could someone help me who's tried implementing this before?   

<SPAN CLASS=editedby>[edited by - fireking &#111;n November 15, 2003 8:53:05 AM]</SPAN>

<SPAN CLASS=editedby>[edited by - fireking &#111;n November 15, 2003 8:53:45 AM]</SPAN>   

void FilterBand(float *band,int stride,int count,float filter){ int i,j=stride; float v = band[0]; for (i=0;i<count-1;i++) {  band[j] = (filter*v + (1-filter)*band[j]);  v = band[j];  j+=stride; }}/*Erosion filter -Erodes a height field in all 4 directions*/void FilterHeightField(float *field,int size,float filter){ int i; /* Erode rows left to right */ for (i=0;i<size;i++) {  FilterBand(&field[size*i],1,size,filter); } /* Erode rows right to left */ for (i=0;i<size;i++) {  FilterBand(&field[size*i+size-1],-1,size,filter); } /* Erode columns top to bottom */ for (i=0;i<size;i++) {  FilterBand(&field[i],size,size,filter); } /* Erode columns bottom to top */ for (i=0;i<size;i++) {  FilterBand(&field[size*(size-1)+i],-size,size,filter); }}

Unhandled exception at 0x77e73887 in createworld.exe: Microsoft C++ exception: std::bad_alloc @ 0x0012fb58.