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Sample cubic bezier vein generator.

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This commit is contained in:
Tomáš Brada 2015-05-10 16:05:48 +02:00
parent f0f1edc94e
commit b183c489ee
1 changed files with 26 additions and 12 deletions
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38
rocks/veins.lua
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@ -1,28 +1,42 @@
-- experimental fast vein generator
local pr
rocksl.genvein=function(minp,maxp,seed,vm,area)
local t1 = os.clock()
local data = vm:get_data()
local chunksize = maxp.x - minp.x + 1
local chunksizer = maxp.x - minp.x + 1
local chunksize = chunksizer + 1
local pmapsize = {x = chunksize, y = chunksize, z = chunksize}
local minpxz = {x = minp.x, y = minp.z}
local pr=PseudoRandom(seed)
pr=pr or PseudoRandom(seed)
local c_sample=minetest.get_content_id("default:mese")
local sample_scarcity=8
local numveins_raw=(chunksize/8)
local numveins = numveins_raw + (pr:next(-100,100)/100)
local numveins = 1
print("numveins="..numveins)
local numveins_raw=(chunksize/sample_scarcity)
local numveins = math.floor(numveins_raw + (pr:next(0,99)/100))
print("numveins="..numveins.." raw="..numveins_raw)
print("pr="..pr:next().." seed="..seed)
print("minp="..minp.x..","..minp.y..","..minp.z)
print("maxp="..maxp.x..","..maxp.y..","..maxp.z)
--local pointA=vector.add(minp,chunksize/2)
local pointA=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
for vc=1, numveins do
local pointA=vector.new(pr:next(minp.x,maxp.x),pr:next(minp.x,maxp.x),pr:next(minp.x,maxp.x))
local pointB=vector.new(pr:next(minp.x,maxp.x),pr:next(minp.x,maxp.x),pr:next(minp.x,maxp.x))
local dir=vector.subtract(pointB,pointA)
local step=(1/vector.length(dir))
--vectorA=vector.add(pointA,minp)
--local pointA=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
local pointB=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
local pointC=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
print("pointA="..pointA.x..","..pointA.y..","..pointA.z)
print("pointB="..pointB.x..","..pointB.y..","..pointB.z)
print("pointC="..pointC.x..","..pointC.y..","..pointC.z)
local step=1.41/(vector.distance(pointA,pointB)+vector.distance(pointB,pointC))
print("step="..step)
for t=0, 1, step do
local p=vector.add(pointA, vector.multiply(dir,t) )
local p=vector.multiply(pointA,(1-t)^2)
p=vector.add(p, vector.multiply(pointB,2*t*(1-t)) )
p=vector.add(p, vector.multiply(pointC,t*t) )
--local p=vector.add(vector.multiply(pointA,(1-t)), vector.multiply(pointB,t) )
p=vector.round(p)
local di=area:index(p.x,p.y,p.z)
data[di]=c_sample