March 2017
Intermediate to advanced
232 pages
4h 44m
Chinese
Content preview from 自造手冊：新工業革命實務指南
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第 12 章 3D 列印
94
區 域 以 及 用 以 製 作 的 機 器 精 度 等 等 考
慮在內，比方說吧，當您手邊的雕刻工
具只有一把鏈鋸時，根本沒什麼細節好
說的。
如 果 您 想 要 重 製 一 個 現 成 東 西 的 話，
可以試著 3D 掃 描 它 再 列 印。您可使用
專用的 3D 掃描器， 或 找 找 看 一 些 搭 配
Microsoft Kinect 或
Structure Scanner
的
3D 掃描 應 用程 式（
http://structure.io
），
不然您也可以拍攝一系列不同角度的照
片 再 用 像 是
Autodesk 123D Catch
這 類
的應用程式把這些圖片轉成物件的數位
模型。
這些技術需要一些專門的知識，因為掃
描所產生的檔案都會有一些缺陷，這需
要使用特定的程式來修正；但這樣做還
是會比製作全新的模型快多了。
修正
電腦模型有時候看起來非常棒，這是因
為您是用 2D 螢幕與工具來檢視與處理各
種 3D 立體物件。事實上，這些「看起來
很完美」的模型可能會有許多嚴重的缺
陷，甚至根本印不出來。
與平面垂直
所有的模型都可說是許多多邊形的近似
拼湊結果；例如 STL 格式就使用了三角
形的網格。每個模型的多邊形都有表面
與裡面。您可用一個垂直於表面的箭頭
來表示外側表面，或者準確一點說，使
用一個與該平面正交（
normal
）的向量，
如
圖 12-7
。
圖 12-7
立方體平面的法線
在一個正確的模型中，所有法線都必需
指向外側。雖然這好像不太重要，但對
於列印來說是相當關鍵的，因為它必須
了解 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.