LPD3DXMESH dx_mesh;
	for (i=0; i<(var)(ent_status(terrain_entity,16)); i++)
		{
			dx_mesh = ent_getmesh(terrain_entity,i,0);		// ent , chunk start with 0 , lod
			D3DXComputeNormals(dx_mesh,NULL);
			ent_setmesh(terrain_entity,dx_mesh,i,0);			
		}

c_setminmax(terrain_entity);
	wait(1);
	c_updatehull(terrain_entity,0);
	//	c_updatehull(terrain_entity,my.frame);
	wait(3);	
		
	for (i=1; i<=(var)(ent_status(terrain_entity,0)); i++)
		{	
			CONTACT* c = ent_getvertex(terrain_entity,NULL,i);   			// vertex number begins with 1 !			
			c_trace( vector((var)c.v.x,(var)c.v.z,vgroundmax.z+500), vector((var)c.v.x,(var)c.v.z,vgroundmin.z-500), IGNORE_ME | IGNORE_SPRITES | IGNORE_MODELS | IGNORE_MAPS | IGNORE_PASSABLE ); 			
			if (HIT_TARGET)	
				{
					// normal 
//					c.v.nx = (float)normal.x; 			
//					c.v.nz = (float)normal.y; 
//					c.v.ny = (float)normal.z; 	
					// or the same with hit
					c.v.nx = (float)hit.nx; 			
					c.v.nz = (float)hit.ny; 
					c.v.ny = (float)hit.nz; 																													
					ent_setvertex(terrain_entity,c,i);
					// or more precisely it should be the average of normals of all neighbouring faceces !!! 
					// it is stored in hmp in an approximated value of 162 stored normal vectors !!!
				}
			
		}