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mirror of https://github.com/sys4-fr/server-nalc.git synced 2024-12-24 01:30:38 +01:00

[vectors_extra] Update

This commit is contained in:
LeMagnesium 2016-01-10 19:27:29 +01:00
parent 9692792f84
commit 635d5c3ba4
3 changed files with 343 additions and 18 deletions

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@ -0,0 +1 @@
WTFPL

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@ -1,2 +1,2 @@
TODO:
add things to this list
maybe make the explosion table function return a perlin explosion table

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@ -1,7 +1,9 @@
local load_time_start = os.clock()
function vector.pos_to_string(pos)
return "{x="..pos.x.."; y="..pos.y.."; z="..pos.z.."}"
local funcs = {}
function funcs.pos_to_string(pos)
return "("..pos.x.."|"..pos.y.."|"..pos.z..")"
end
local r_corr = 0.25 --remove a bit more nodes (if shooting diagonal) to let it look like a hole (sth like antialiasing)
@ -118,7 +120,7 @@ local function return_fine_line(pos, dir, range, scale)
return ps2
end
function vector.fine_line(pos, dir, range, scale)
function funcs.fine_line(pos, dir, range, scale)
--assert_vector(pos)
if not range then --dir = pos2
dir = vector.direction(pos, dir)
@ -127,7 +129,7 @@ function vector.fine_line(pos, dir, range, scale)
return return_fine_line(pos, dir, range, scale)
end
function vector.line(pos, dir, range, alt)
function funcs.line(pos, dir, range, alt)
--assert_vector(pos)
if alt then
if not range then --dir = pos2
@ -149,7 +151,7 @@ function vector.line(pos, dir, range, alt)
end
local twolines = {}
function vector.twoline(x, y)
function funcs.twoline(x, y)
local pstr = x.." "..y
local line = twolines[pstr]
if line then
@ -183,7 +185,7 @@ function vector.twoline(x, y)
end
local threelines = {}
function vector.threeline(x, y, z)
function funcs.threeline(x, y, z)
local pstr = x.." "..y.." "..z
local line = threelines[pstr]
if line then
@ -218,16 +220,104 @@ function vector.threeline(x, y, z)
return line
end
function vector.straightdelay(s, v, a)
function funcs.sort(ps, preferred_coords)
preferred_coords = preferred_coords or {"z", "y", "x"}
local a,b,c = unpack(preferred_coords)
local function ps_sorting(p1, p2)
if p1[a] == p2[a] then
if p1[b] == p2[a] then
if p1[c] < p2[c] then
return true
end
elseif p1[b] < p2[b] then
return true
end
elseif p1[a] < p2[a] then
return true
end
end
table.sort(ps, ps_sorting)
end
function funcs.scalar(v1, v2)
return v1.x*v2.x + v1.y*v2.y + v1.z*v2.z
end
function funcs.cross(v1, v2)
return {
x = v1.y*v2.z - v1.z*v2.y,
y = v1.z*v2.x - v1.x*v2.z,
z = v1.x*v2.y - v1.y*v2.x
}
end
--not optimized
--local areas = {}
function funcs.plane(ps)
-- sort positions and imagine the first one (A) as vector.zero
ps = vector.sort(ps)
local pos = ps[1]
local B = vector.subtract(ps[2], pos)
local C = vector.subtract(ps[3], pos)
-- get the positions for the fors
local cube_p1 = {x=0, y=0, z=0}
local cube_p2 = {x=0, y=0, z=0}
for i in pairs(cube_p1) do
cube_p1[i] = math.min(B[i], C[i], 0)
cube_p2[i] = math.max(B[i], C[i], 0)
end
cube_p1 = vector.apply(cube_p1, math.floor)
cube_p2 = vector.apply(cube_p2, math.ceil)
local vn = vector.normalize(vector.cross(B, C))
local nAB = vector.normalize(B)
local nAC = vector.normalize(C)
local angle_BAC = math.acos(vector.scalar(nAB, nAC))
local nBA = vector.multiply(nAB, -1)
local nBC = vector.normalize(vector.subtract(C, B))
local angle_ABC = math.acos(vector.scalar(nBA, nBC))
for z = cube_p1.z, cube_p2.z do
for y = cube_p1.y, cube_p2.y do
for x = cube_p1.x, cube_p2.x do
local p = {x=x, y=y, z=z}
local n = -vector.scalar(p, vn)/vector.scalar(vn, vn)
if math.abs(n) <= 0.5 then
local ep = vector.add(p, vector.multiply(vn, n))
local nep = vector.normalize(ep)
local angle_BAep = math.acos(vector.scalar(nAB, nep))
local angle_CAep = math.acos(vector.scalar(nAC, nep))
local angldif = angle_BAC - (angle_BAep+angle_CAep)
if math.abs(angldif) < 0.001 then
ep = vector.subtract(ep, B)
nep = vector.normalize(ep)
local angle_ABep = math.acos(vector.scalar(nBA, nep))
local angle_CBep = math.acos(vector.scalar(nBC, nep))
local angldif = angle_ABC - (angle_ABep+angle_CBep)
if math.abs(angldif) < 0.001 then
table.insert(ps, vector.add(pos, p))
end
end
end
end
end
end
return ps
end
function funcs.straightdelay(s, v, a)
if not a then
return s/v
end
return (math.sqrt(v*v+2*a*s)-v)/a
end
vector.zero = {x=0, y=0, z=0}
vector.zero = vector.new()
function vector.sun_dir(time)
function funcs.sun_dir(time)
if not time then
time = minetest.get_timeofday()
end
@ -240,7 +330,7 @@ function vector.sun_dir(time)
return {x=tmp, y=math.sqrt(1-tmp*tmp), z=0}
end
function vector.inside(pos, minp, maxp)
function funcs.inside(pos, minp, maxp)
for _,i in pairs({"x", "y", "z"}) do
if pos[i] < minp[i]
or pos[i] > maxp[i] then
@ -250,8 +340,8 @@ function vector.inside(pos, minp, maxp)
return true
end
function vector.minmax(p1, p2)
local p1 = vector.new(p1) --Are these 2 redefinitions necessary?
function funcs.minmax(p1, p2)
local p1 = vector.new(p1)
local p2 = vector.new(p2)
for _,i in ipairs({"x", "y", "z"}) do
if p1[i] > p2[i] then
@ -261,7 +351,7 @@ function vector.minmax(p1, p2)
return p1, p2
end
function vector.move(p1, p2, s)
function funcs.move(p1, p2, s)
return vector.round(
vector.add(
vector.multiply(
@ -276,8 +366,12 @@ function vector.move(p1, p2, s)
)
end
function funcs.from_number(i)
return {x=i, y=i, z=i}
end
local explosion_tables = {}
function vector.explosion_table(r)
function funcs.explosion_table(r)
local table = explosion_tables[r]
if table then
return table
@ -308,8 +402,92 @@ function vector.explosion_table(r)
return tab
end
local default_nparams = {
offset = 0,
scale = 1,
seed = 1337,
octaves = 6,
persist = 0.6
}
function funcs.explosion_perlin(rmin, rmax, nparams)
local t1 = os.clock()
local r = math.ceil(rmax)
nparams = nparams or {}
for i,v in pairs(default_nparams) do
nparams[i] = nparams[i] or v
end
nparams.spread = nparams.spread or vector.from_number(r*5)
local pos = {x=math.random(-30000, 30000), y=math.random(-30000, 30000), z=math.random(-30000, 30000)}
local map = minetest.get_perlin_map(nparams, vector.from_number(r+r+1)):get3dMap_flat(pos)
local id = 1
local bare_maxdist = rmax*rmax
local bare_mindist = rmin*rmin
local mindist = math.sqrt(bare_mindist)
local dist_diff = math.sqrt(bare_maxdist)-mindist
mindist = mindist/dist_diff
local pval_min, pval_max
local tab, n = {}, 1
for z=-r,r do
local bare_dist = z*z
for y=-r,r do
local bare_dist = bare_dist+y*y
for x=-r,r do
local bare_dist = bare_dist+x*x
local add = bare_dist < bare_mindist
local pval, distdiv
if not add
and bare_dist <= bare_maxdist then
distdiv = math.sqrt(bare_dist)/dist_diff-mindist
pval = math.abs(map[id]) -- strange perlin values…
if not pval_min then
pval_min = pval
pval_max = pval
else
pval_min = math.min(pval, pval_min)
pval_max = math.max(pval, pval_max)
end
add = true--distdiv < 1-math.abs(map[id])
end
if add then
tab[n] = {{x=x, y=y, z=z}, pval, distdiv}
n = n+1
end
id = id+1
end
end
end
-- change strange values
local pval_diff = pval_max - pval_min
pval_min = pval_min/pval_diff
for n,i in pairs(tab) do
if i[2] then
local new_pval = math.abs(i[2]/pval_diff - pval_min)
if i[3]+0.33 < new_pval then
tab[n] = {i[1]}
elseif i[3] < new_pval then
tab[n] = {i[1], true}
else
tab[n] = nil
end
end
end
minetest.log("info", string.format("[vector_extras] table created after ca. %.2fs", os.clock() - t1))
return tab
end
local circle_tables = {}
function vector.circle(r)
function funcs.circle(r)
local table = circle_tables[r]
if table then
return table
@ -332,7 +510,7 @@ function vector.circle(r)
end
local ring_tables = {}
function vector.ring(r)
function funcs.ring(r)
local table = ring_tables[r]
if table then
return table
@ -373,10 +551,156 @@ function vector.ring(r)
return tab2
end
function vector.chunkcorner(pos)
function funcs.chunkcorner(pos)
return {x=pos.x-pos.x%16, y=pos.y-pos.y%16, z=pos.z-pos.z%16}
end
function funcs.point_distance_minmax(p1, p2)
local p1 = vector.new(p1)
local p2 = vector.new(p2)
local min, max, vmin, vmax, num
for _,i in ipairs({"x", "y", "z"}) do
num = math.abs(p1[i] - p2[i])
if not vmin or num < vmin then
vmin = num
min = i
end
if not vmax or num > vmax then
vmax = num
max = i
end
end
return min, max
end
function funcs.collision(p1, p2)
local clear, node_pos, collision_pos, max, min, dmax, dcmax, pt
clear, node_pos = minetest.line_of_sight(p1, p2)
if clear then
return false
end
collision_pos = {}
min, max = funcs.point_distance_minmax(node_pos, p2)
if node_pos[max] > p2[max] then
collision_pos[max] = node_pos[max] - 0.5
else
collision_pos[max] = node_pos[max] + 0.5
end
dmax = p2[max] - node_pos[max]
dcmax = p2[max] - collision_pos[max]
pt = dcmax/dmax
for _,i in ipairs({"x", "y", "z"}) do
collision_pos[i] = p2[i] - (p2[i] - node_pos[i]) * pt
end
return true, collision_pos, node_pos
end
function funcs.get_data_from_pos(tab, z,y,x)
local data = tab[z]
if data then
data = data[y]
if data then
return data[x]
end
end
end
function funcs.set_data_to_pos(tab, z,y,x, data)
if tab[z] then
if tab[z][y] then
tab[z][y][x] = data
return
end
tab[z][y] = {[x] = data}
return
end
tab[z] = {[y] = {[x] = data}}
end
function funcs.set_data_to_pos_optional(tab, z,y,x, data)
if vector.get_data_from_pos(tab, z,y,x) ~= nil then
return
end
funcs.set_data_to_pos(tab, z,y,x, data)
end
function funcs.remove_data_from_pos(tab, z,y,x)
if vector.get_data_from_pos(tab, z,y,x) == nil then
return
end
tab[z][y][x] = nil
if not next(tab[z][y]) then
tab[z][y] = nil
end
if not next(tab[z]) then
tab[z] = nil
end
end
function funcs.get_data_pos_table(tab)
local t,n = {},1
local minz, miny, minx, maxz, maxy, maxx
for z,yxs in pairs(tab) do
if not minz then
minz = z
maxz = z
else
minz = math.min(minz, z)
maxz = math.max(maxz, z)
end
for y,xs in pairs(yxs) do
if not miny then
miny = y
maxy = y
else
miny = math.min(miny, y)
maxy = math.max(maxy, y)
end
for x,v in pairs(xs) do
if not minx then
minx = x
maxx = x
else
minx = math.min(minx, x)
maxx = math.max(maxx, x)
end
t[n] = {z,y,x, v}
n = n+1
end
end
end
return t, {x=minx, y=miny, z=minz}, {x=maxx, y=maxy, z=maxz}, n-1
end
function funcs.update_minp_maxp(minp, maxp, pos)
for _,i in pairs({"z", "y", "x"}) do
minp[i] = math.min(minp[i], pos[i])
maxp[i] = math.max(maxp[i], pos[i])
end
end
function funcs.quickadd(pos, z,y,x)
if z then
pos.z = pos.z+z
end
if y then
pos.y = pos.y+y
end
if x then
pos.x = pos.x+x
end
end
function funcs.unpack(pos)
return pos.z, pos.y, pos.x
end
dofile(minetest.get_modpath("vector_extras").."/vector_meta.lua")
for name,func in pairs(funcs) do
vector[name] = vector[name] or func
end
minetest.log("info", string.format("[vector_extras] loaded after ca. %.2fs", os.clock() - load_time_start))