三点编辑Three-Point Editing

三点编辑（Three-Point Editing）是 Resolve 计算"素材放哪里、放多长"的基本规则——源片段的入/出点加时间线的入/出点共四个点，你定任意三个，系统自动算出第四个。

• 四点取三：源 In、源 Out、时间线 In、时间线 Out 中定三个，落点和时长就唯一确定。
• 少打也能剪：播放头本身就是隐含的一个点，素材的头尾也是——不手动标点，系统照样用隐含点。
• Insert 不覆盖：插入编辑把新片段塞进来，后面的内容整体右移，谁都不丢。
• Overwrite 会盖：覆盖编辑用新片段盖掉等长的旧内容，时间线总长不变。
• 入口在查看器：把源片段拖到时间线查看器画面上，会浮现 Insert、Overwrite 等叠加层，拖到哪个执行哪个。

Three-Point Editing is Resolve's basic rule for calculating where a clip goes and how long it runs — the source In/Out plus the timeline In/Out make four points; set any three and Resolve works out the fourth.

• Three of four: fix any three of source In, source Out, timeline In, and timeline Out, and the landing spot plus duration are locked in.
• Fewer marks still work: the playhead counts as an implied point, and so do the clip's head and tail — with no manual marks, implied ones are used.
• Insert never overwrites: an Insert edit squeezes the new clip in and shifts everything after it to the right — nothing is lost.
• Overwrite does: an Overwrite edit covers the same length of existing content, leaving the total duration unchanged.
• The viewer is the entry point: drag the source clip onto the timeline viewer and overlays like Insert and Overwrite appear — drop on one to perform it.