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mods/futil/minetest/raycast.lua

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+-- before 5.9, raycasts can miss objects they should hit if the cast is too short
+-- see https://github.com/minetest/minetest/issues/14337
+function futil.safecast(start, stop, objects, liquids, margin)
+	margin = margin or 5
+	local ray = stop - start
+	local ray_length = ray:length()
+	if ray_length == 0 then
+		return function() end
+	elseif ray_length >= margin then
+		return Raycast(start, stop, objects, liquids)
+	end
+
+	local actual_stop = start + ray:normalize() * margin
+	local raycast = Raycast(start, actual_stop, objects, liquids)
+	local stopped = false
+	return function()
+		if stopped then
+			return
+		end
+		local pt = raycast()
+		if pt then
+			local ip = pt.intersection_point
+			if (ip - start):length() > ray_length then
+				stopped = true
+				return
+			end
+			return pt
+		end
+	end
+end