I'm setting up a race game and have attached a car to a path. I'm making it move around an oval track. I want to make the car look at the next five nodes and look at the angel difference between them. However I am having a bit of a problem comming up with a good solution.


Code:
for(i = 1; i < 5; i++)
		{
			
			
			
			if((cur_node + 1) > my.number_of_nodes_on_my_path)
			{
				cur_node = 0;	
			}
			path_getnode(my,cur_node + i,NEW_POSITION,NULL);
			//-------------------------------------------
			

			b = vec_dot(OLD_POSITION,NEW_POSITION) / (  vec_length(OLD_POSITION ) * vec_length(NEW_POSITION)  )  ;
			
			
			if(b < 0) b *= -1;//no negative numbers around here
			
			
			a += b;
			
		
			vec_set(OLD_POSITION,NEW_POSITION);
			
			
		}//end of for loop


Issue with this is the numbers are not constant for what is happening on the world. I have a higher value for going on the straights than i could have going around the curves, but not constant enough for me to understand why.

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