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Rework the cut tool 

Use adjusted code from smooth tool
master
Dmitry Kostenko 2021-02-11 00:39:43 +01:00
parent 8b50be70a8
commit 561de74854
1 changed files with 36 additions and 18 deletions
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54
init.lua
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@ -651,32 +651,50 @@ terraform:register_tool("brush", {
cut = function()
return {
get_bounds = function(self, player, target_pos, size_3d)
return vector.subtract(target_pos, size_3d), vector.add(target_pos, size_3d)
local pp = vector.floor(player:get_pos())
local minp,maxp = vector.subtract(target_pos, size_3d), vector.add(target_pos, size_3d)
return vector.new(math.min(minp.x, pp.x), math.min(minp.y, pp.y), math.min(minp.z, pp.z)),
vector.new(math.max(maxp.x, pp.x), math.max(maxp.y, pp.y), math.max(maxp.z, pp.z))
end,
paint = function(self, data, a, target_pos, minp, maxp, ctx)
local origin = a:indexp(target_pos)
local normal = vector.direction(target_pos, ctx.player:get_pos())
local threshold = math.pi / 36 -- 5 degrees
local paint_flags = {}
-- Spherical shape
for x = -ctx.size_3d.x,ctx.size_3d.x do
for y = -ctx.size_3d.y,ctx.size_3d.y do
for z = -ctx.size_3d.z,ctx.size_3d.z do
local r = (x/ctx.size_3d.x)^2 + (y/ctx.size_3d.y)^2 + (z/ctx.size_3d.z)^2
if r <= 1 then
local i = origin + x + y*a.ystride + z*a.zstride
local function get_weight(i,r)
local top, bottom = 0, 0
local dot = vector.dot(normal, vector.new(x, y, z))
if math.abs(dot) > threshold and ctx.in_mask(data[i]) then
if dot <= 0 then
data[i] = ctx.get_paint()
else
data[i] = minetest.CONTENT_AIR
end
end
for lx = -r,r do
for ly = -r,r do
for lz = -r,r do
local weight = 1 -- all dots are equal, but this could be fancier
top = top + (data[i + lx + a.ystride*ly + a.zstride*lz] ~= minetest.CONTENT_AIR and weight or 0)
bottom = bottom + weight
end
end
end
return top / bottom
end
-- Spherical shape
-- Reduce all bounds by 1 to avoid edge glitches when looking for neighbours
for x = -ctx.size_3d.x+1,ctx.size_3d.x-1 do
for y = -ctx.size_3d.y+1,ctx.size_3d.y-1 do
for z = -ctx.size_3d.z+1,ctx.size_3d.z-1 do
local r = (x/ctx.size_3d.x)^2 + (y/ctx.size_3d.y)^2 + (z/ctx.size_3d.z)^2
if r <= 1 then
local i = origin + x + a.ystride*y + a.zstride*z
local rr = math.floor(math.max(1,math.min(ctx.size_3d.x/3,(1-r)*ctx.size_3d.x)))
local dotproduct = vector.dot(ctx.player:get_look_dir(), vector.normalize(vector.new(x,y,z)))
paint_flags[i] = (get_weight(i, rr) + dotproduct < 0.5)
end
end
end
end
for pos,is_air in pairs(paint_flags) do
if is_air ~= (data[pos] == minetest.CONTENT_AIR) then
ctx.draw(pos, is_air and minetest.CONTENT_AIR or ctx.get_paint())
end
end
end,
}