237 lines
6.5 KiB
Lua
237 lines
6.5 KiB
Lua
-- Distance from center to side of the laser beam square. Not really the radius, but it sounds cooler. :P
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local LASER_RADIUS = -1/16
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local COLSTRING_IDS = {
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[lzr_globals.COLOR_NONE] = "_", -- nothing
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[lzr_globals.COLOR_RED] = "R", -- red
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[lzr_globals.COLOR_GREEN] = "G", -- green
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[lzr_globals.COLOR_YELLOW] = "Y", -- yellow (R+G)
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[lzr_globals.COLOR_BLUE] = "B", -- blue
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[lzr_globals.COLOR_MAGENTA] = "M", -- magenta (R+B)
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[lzr_globals.COLOR_CYAN] = "C", -- cyan (G+B)
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[lzr_globals.COLOR_WHITE] = "W", -- white (R+G+B)
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}
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-- The maximum possible colorcode
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local MAX_COLORCODE = 7
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-- DATA FORMATS:
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--[[ colorcode:
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A number representing a laser color.
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It ranges from 0 to 7.
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Value 0 stands for 'no color', the absense of a laser.
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There are 3 primary colors:
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* 1 = red
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* 2 = green
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* 4 = blue
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The other values are reserved for secondary colors that
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result from adding the values from 2 primary colors
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that have been additive color mixing.
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See lzr_globals for the full list of colorcodes.
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]]
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--[[ dirstring: A representation of 3 axes (XYZ) which each have
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a colorcode converted to a string.
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The 3 characters stand for these directions, in order: X, Y, Z
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Example: "140" = red on X axis, blue on Y axis and no laser in the Z axis
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]]
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--[[ dirs table: Like dirstring, but in table format. It's a table
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with 3 numbers, each of them is a colorcode.
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The same order of axes is used like for dirstring.
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Example: { 1, 4, 0 } -- X = red, Y = blue, Z = no laser
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]]
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-- Converts a dirstring to a dirs table
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function lzr_laser.dirstring_to_dirs(dirstring)
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local dirs = {}
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for d=1, 3 do
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local dirnum = tonumber(string.sub(dirstring, d, d))
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if not dirnum then
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error("[lzr_laser] dirstring_to_dirs: Invalid dirstring! Character #"..d.." is not a digit.")
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elseif dirnum >= 0 and dirnum <= MAX_COLORCODE then
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dirs[d] = dirnum
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else
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error("[lzr_laser] dirstring_to_dirs: Invalid dirstring! Character #"..d.." is outside the valid digit value range (0-"..MAX_COLORCODE..").")
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end
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end
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return dirs
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end
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-- Converts a dirstring into a "colstring", a string
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-- of letters each representing a color
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function lzr_laser.dirstring_to_colstring(dirstring)
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local dirs = {}
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local colstr = ""
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for d=1, 3 do
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local dirnum = tonumber(string.sub(dirstring, d, d))
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if not dirnum then
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error("[lzr_laser] dirstring_to_dirs: Invalid dirstring! Character #"..d.." is not a digit.")
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elseif dirnum >= 0 or dirnum <= MAX_COLORCODE then
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colstr = colstr .. COLSTRING_IDS[dirnum]
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else
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error("[lzr_laser] dirstring_to_dirs: Invalid dirstring! Character #"..d.." is outside the valid digit value range (0-7).")
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end
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end
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return colstr
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end
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-- Converts a dirs table to a dirstring
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function lzr_laser.dirs_to_dirstring(dirs)
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local dirstring = ""
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for d=1, 3 do
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if dirs[d] >= 0 or dirs[d] <= MAX_COLORCODE then
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dirstring = dirstring .. tostring(dirs[d])
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else
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error("[lzr_laser] dirs_to_dirstring: Invalid dirs!")
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end
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end
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return dirstring
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end
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function lzr_laser.vector_to_dirs(dir_vector)
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local dirs = {0,0,0}
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if dir_vector.x ~= 0 then
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dirs[1] = 1
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end
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if dir_vector.y ~= 0 then
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dirs[2] = 1
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end
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if dir_vector.z ~= 0 then
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dirs[3] = 1
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end
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return dirs
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end
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function lzr_laser.vector_and_color_to_dirs(dir_vector, color)
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local dirs = {0,0,0}
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if dir_vector.x ~= 0 then
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dirs[1] = color
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end
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if dir_vector.y ~= 0 then
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dirs[2] = color
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end
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if dir_vector.z ~= 0 then
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dirs[3] = color
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end
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return dirs
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end
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-- Convert number to string in binary form
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-- * num: Number
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-- * minLength: Minimum number of characters the string must have, will
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-- fill string with leading zeroes if needed (default: 1)
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-- Returns: string
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function lzr_laser.dec2bin(num, minLength)
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if not minLength then
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minLength = 1
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end
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local t = {}
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local rem
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while num > 0 do
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rem = math.fmod(num,2)
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t[#t+1] = rem
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num = (num-rem)/2
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end
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local bin = table.concat(t)
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bin = string.reverse(bin)
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local length = string.len(bin)
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if length < minLength then
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bin = string.rep("0", minLength - length) .. bin
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end
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return bin
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end
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-- Takes 2 binary numbers (as strings!)
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-- and returns the 'bitwise or' of them (also as string).
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-- Both strings MUST be of equal length.
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function lzr_laser.bitwise_or(bin1, bin2)
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local len = string.len(bin1)
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local out = ""
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for i=1, len do
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if string.sub(bin1, i, i) == "1" or string.sub(bin2, i, i) == "1" then
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out = out .. "1"
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else
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out = out .. "0"
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end
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end
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return out
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end
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-- Lookup table for dirstring_or
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local colorcode_bor_lookup = {}
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for i=0, MAX_COLORCODE do
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colorcode_bor_lookup[tostring(i)] = {}
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for j=0, MAX_COLORCODE do
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colorcode_bor_lookup[tostring(i)][tostring(j)] = tostring(bit.bor(i, j))
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end
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end
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-- Takes two dirstrings (with digits from 0 to 7)
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-- and does a bitwise or on each digit on them
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-- and returns the result.
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-- Example: "001" and "003" give "003"
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function lzr_laser.dirstring_or(dirstring1, dirstring2)
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local len = string.len(dirstring1)
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local out = ""
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for i=1, len do
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local d1 = string.sub(dirstring1, i, i)
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local d2 = string.sub(dirstring2, i, i)
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-- We use a lookup table for improved performance
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-- since this function is called for every
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-- laser step in the laser propagation
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-- algorithm.
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local res = colorcode_bor_lookup[d1][d2]
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out = out .. tostring(res)
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end
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return out
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end
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-- Generates a line of particles between `pos1` and `pos2` with particle texture `particle`
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function lzr_laser.particle_line(pos1, pos2, particle)
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local steps = 30
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local amount = 10
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local spread = 0.1
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local vspread = 0.01
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local size = 0.4
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local pos = vector.copy(pos1)
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for i=0,steps-1 do
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pos.x = pos1.x + (pos2.x - pos1.x) * (i/steps)
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pos.y = pos1.y + (pos2.y - pos1.y) * (i/steps)
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pos.z = pos1.z + (pos2.z - pos1.z) * (i/steps)
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minetest.add_particlespawner({
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amount = amount,
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time = 0.001,
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minpos = vector.subtract(pos, vector.new(spread, spread, spread)),
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maxpos = vector.add(pos, vector.new(spread, spread, spread)),
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minvel = vector.new(-vspread, -vspread, -vspread),
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maxvel = vector.new(vspread, vspread, vspread),
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minsize = size,
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maxsize = size,
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texture = particle,
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minexptime = 1.5,
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maxexptime = 1.7,
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})
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end
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end
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local dirstring_lookup = {}
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function lzr_laser.laser_group_to_dirstring(laser_group)
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return dirstring_lookup[laser_group]
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end
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function lzr_laser.colors_to_laser_group(color_x, color_y, color_z)
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return color_x + color_y * 8 + color_z * 64
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end
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-- Create a lookup table for laser_group_to_distring for performance
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for x=0,MAX_COLORCODE do
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for y=0,MAX_COLORCODE do
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for z=0,MAX_COLORCODE do
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local val = lzr_laser.colors_to_laser_group(x,y,z)
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dirstring_lookup[val] = x .. y .. z
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end
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end
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end
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