gridwidth=20;
gridheight=20;
mod=d3d_model_create();
d3d_model_primitive_begin(mod,pr_trianglelist)


var gx, gy;

for(i=0;i<gridwidth;i+=1) //Initiieren, was für Werte du nimmst, musst du wissen, wo sie herkommen auch ;)
	{
	gx=i;
	for(i=0;i<gridheight;i+=1)
		{
		gy=i;
		grid[gx,gy]=0;
		}
	}

for(i=0;i<gridwidth;i+=1) //Vertices setzen.
 {
 gx=i;
 for(i=0;i<gridheight;i+=1)
  {
  gy=i;
  for(i=0;i<2;i+=1)
   {
   switch(i)
    {
    case 0:
	{
	d3d_model_vertex(mod,gx,gy,grid[gx,gy]);
	d3d_model_vertex(mod,gx+1,gy,grid[gx+1,gy]);
	d3d_model_vertex(mod,gx+1,gy+1,grid[gx+1,gy+1]);
	break;
	}
    case 1:
	{
	d3d_model_vertex(mod,gx,gy,grid[gx,gy]);
	d3d_model_vertex(mod,gx,gy+1,grid[gx,gy+1]);
	d3d_model_vertex(mod,gx+1,gy+1,grid[gx+1,gy+1]);
	break;
	}
    }
   }
  }
 }

d3d_model_primitive_end(mod);