recursion - Line and intersection based pathfinding -



recursion - Line and intersection based pathfinding -

i trying develop pathfinding algorithm finds closest path point tracing line initial position final position. test intersections obstacles ( of them in game rectangular ) , draw 2 new lines, 1 each of visible corners of obstacle. then, draw lines 2 corners endpoint , repeat intersection test each branch of path.

my question this: how propagate branching paths in lua without recursion? seems pretty easy recursion, don't want risk stack overflow , crash if path gets long.

if there technical term technique using, please tell me. own research when can.

there recursion , iteration. lua supports "infinite recursion" via tail calls, if can express recursion in terms of tail calls there no risk of stack overflow. example:

function f(x) if x==0 homecoming 0 end -- end recursion .... stuff ... homecoming f(x-1) end

section 6.3 of programming in lua (available online) discusses this.

if can't determine way tail calls have utilize iteration. illustration start 1 path, using while loop test how many intersections (exit loop when 0); loop calls function computes 2 new paths; each path added list; while loop in paths loop (since # of paths increases); path length can computed simultaneously; paths dead end , dropped; cyclical , should dropped; , rest arrive @ destination. maintain 1 shortest path or travel time (not same).

recursion lua line path-finding

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