mirror of
git://repo.or.cz/rocks.git
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48 lines
2.0 KiB
Lua
48 lines
2.0 KiB
Lua
-- experimental fast vein generator
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local pr
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rocksl.genvein=function(minp,maxp,seed,vm,area)
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local t1 = os.clock()
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local data = vm:get_data()
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local chunksizer = maxp.x - minp.x + 1
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local chunksize = chunksizer + 1
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local pmapsize = {x = chunksize, y = chunksize, z = chunksize}
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local minpxz = {x = minp.x, y = minp.z}
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pr=pr or PseudoRandom(seed)
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local c_sample=minetest.get_content_id("default:mese")
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local sample_scarcity=8
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local numveins_raw=(chunksize/sample_scarcity)
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local numveins = math.floor(numveins_raw + (pr:next(0,99)/100))
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print("numveins="..numveins.." raw="..numveins_raw)
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print("pr="..pr:next().." seed="..seed)
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print("minp="..minp.x..","..minp.y..","..minp.z)
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print("maxp="..maxp.x..","..maxp.y..","..maxp.z)
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--local pointA=vector.add(minp,chunksize/2)
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local pointA=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
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for vc=1, numveins do
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--local pointA=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
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local pointB=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
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local pointC=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
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print("pointA="..pointA.x..","..pointA.y..","..pointA.z)
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print("pointB="..pointB.x..","..pointB.y..","..pointB.z)
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print("pointC="..pointC.x..","..pointC.y..","..pointC.z)
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local step=1.41/(vector.distance(pointA,pointB)+vector.distance(pointB,pointC))
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print("step="..step)
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for t=0, 1, step do
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local p=vector.multiply(pointA,(1-t)^2)
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p=vector.add(p, vector.multiply(pointB,2*t*(1-t)) )
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p=vector.add(p, vector.multiply(pointC,t*t) )
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--local p=vector.add(vector.multiply(pointA,(1-t)), vector.multiply(pointB,t) )
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p=vector.round(p)
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local di=area:index(p.x,p.y,p.z)
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data[di]=c_sample
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end
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end
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vm:set_data(data)
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minetest.log("action", "rocks/genvein/ "..math.ceil((os.clock() - t1) * 1000).." ms ")
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end |