forked from VoxeLibre/VoxeLibre
72 lines
1.6 KiB
Lua
72 lines
1.6 KiB
Lua
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local math, vector, minetest, mcl_mobs = math, vector, minetest, mcl_mobs
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local mob_class = mcl_mobs.mob_class
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-- check line of sight (BrunoMine)
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function mob_class:line_of_sight(pos1, pos2, stepsize)
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stepsize = stepsize or 1
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local s, pos = minetest.line_of_sight(pos1, pos2, stepsize)
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-- normal walking and flying mobs can see you through air
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if s == true then
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return true
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end
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-- New pos1 to be analyzed
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local npos1 = {x = pos1.x, y = pos1.y, z = pos1.z}
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local r, pos = minetest.line_of_sight(npos1, pos2, stepsize)
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-- Checks the return
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if r == true then return true end
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-- Nodename found
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local nn = minetest.get_node(pos).name
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-- Target Distance (td) to travel
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local td = vector.distance(pos1, pos2)
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-- Actual Distance (ad) traveled
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local ad = 0
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-- It continues to advance in the line of sight in search of a real
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-- obstruction which counts as 'normal' nodebox.
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while minetest.registered_nodes[nn]
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and minetest.registered_nodes[nn].walkable == false do
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-- Check if you can still move forward
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if td < ad + stepsize then
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return true -- Reached the target
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end
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-- Moves the analyzed pos
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local d = vector.distance(pos1, pos2)
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npos1.x = ((pos2.x - pos1.x) / d * stepsize) + pos1.x
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npos1.y = ((pos2.y - pos1.y) / d * stepsize) + pos1.y
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npos1.z = ((pos2.z - pos1.z) / d * stepsize) + pos1.z
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-- NaN checks
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if d == 0
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or npos1.x ~= npos1.x
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or npos1.y ~= npos1.y
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or npos1.z ~= npos1.z then
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return false
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end
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ad = ad + stepsize
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-- scan again
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r, pos = minetest.line_of_sight(npos1, pos2, stepsize)
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if r == true then return true end
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-- New Nodename found
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nn = minetest.get_node(pos).name
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end
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return false
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end
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