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synced 2024-08-21 17:37:25 +02:00
Get rail reattachment (especially after jumps) working correctly
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@ -98,6 +98,31 @@ mod.south = south
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mod.east = east
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mod.west = west
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--[[
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mcl_minecarts.snap_direction(dir)
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returns a valid cart direction that has the smallest angle difference to `dir'
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]]
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local VALID_DIRECTIONS = {
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north, vector.offset(north, 0, 1, 0), vector.offset(north, 0, -1, 0),
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south, vector.offset(south, 0, 1, 0), vector.offset(south, 0, -1, 0),
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east, vector.offset(east, 0, 1, 0), vector.offset(east, 0, -1, 0),
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west, vector.offset(west, 0, 1, 0), vector.offset(west, 0, -1, 0),
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}
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function mod.snap_direction(dir)
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dir = vector.normalize(dir)
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local best = nil
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local diff = -1
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for _,d in pairs(VALID_DIRECTIONS) do
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local dot = vector.dot(dir,d)
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if dot > diff then
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best = d
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diff = dot
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end
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end
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return best
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end
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local CONNECTIONS = { north, south, east, west }
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local HORIZONTAL_STANDARD_RULES = {
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[N] = { "", 0, mask = N, score = 1, can_slope = true },
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@ -41,7 +41,6 @@ end
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local function detach_minecart(self)
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local staticdata = self._staticdata
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print("Detaching minecart")
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staticdata.connected_at = nil
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self.object:set_velocity(staticdata.dir * staticdata.velocity)
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@ -453,13 +452,15 @@ local function do_detached_movement(self, dtime)
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local pos_r = vector.round(self.object:get_pos())
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local node = minetest.get_node(pos_r)
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if minetest.get_item_group(node.name, "rail") ~= 0 then
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print("Reconnected railcart at "..tostring(pos_r))
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staticdata.connected_at = pos_r
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staticdata.railtype = node.name
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local freebody_velocity = self.object:get_velocity()
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staticdata.dir = vector.normalize(freebody_velocity)
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staticdata.velocity = vector.length(freebody_velocity)
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staticdata.dir = mod:get_rail_direction(pos_r, mod.snap_direction(freebody_velocity))
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-- Use vector projection to only keep the velocity in the new direction of movement on the rail
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-- https://en.wikipedia.org/wiki/Vector_projection
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staticdata.velocity = vector.dot(staticdata.dir,freebody_velocity)
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-- Clear freebody movement
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self.object:set_velocity(vector.new(0,0,0))
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