mirror of git://repo.or.cz/rocks.git
54 lines
1.9 KiB
Lua
54 lines
1.9 KiB
Lua
-- experimental fast vein generator
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local function draw_sphere(data,area,pos,radius,with)
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local rsq=radius^2
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radius=radius+2
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for x=-radius, radius do
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for y=-radius, radius do
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for z=-radius, radius do
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if (x^2)+(y^2)+(z^2)<=rsq then
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data[area:index(x+pos.x,y+pos.y,z+pos.z)]=with
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end
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end end end
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end
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local function line(data,area,A,B,with)
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local length=vector.distance(A,B)
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local step=1/length
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for t=0, 1, step do
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local p=vector.add(vector.multiply(A,(1-t)), vector.multiply(B,t) )
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p=vector.round(p)
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data[area:index(p.x,p.y,p.z)]=with
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end
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end
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rocksl.genvein=function(minp,maxp,pr,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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local c_sample=minetest.get_content_id("default:mese")
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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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local pointB2=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 l1=vector.distance(pointA,pointB)+vector.distance(pointB,pointC)
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local l2=1/(vector.distance(pointA,pointB2)+vector.distance(pointB2,pointC))
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local step=1.3/math.max(l1,l2)
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for t=0, 1, step do
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local p
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p=vector.multiply(pointA,(1-t)^2)
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p=vector.add(p, vector.multiply(pointC,t*t) )
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p=vector.add(p, vector.multiply(pointB,2*t*(1-t)) )
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local p2=vector.add(p, vector.multiply(pointB2,2*t*(1-t)) )
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line(data,area,p,p2,c_sample)
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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 |