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Snap the parent tip and child origin to each other as needed

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Domain
desktop-dev, tooling

Research direction

No files, tests, or entry points are named. Start by reproducing the bone creation, viewport tip-dragging, and setup-mode child-translation workflows described in the issue; done means the relevant parent tip and child origin can snap to each other while preserving the intended attachment in both operations.

Written by the indexing model from the issue text.

Description

enhancement

When creating bones, you may occasionally need to adjust the tip of a parent bone later so that it aligns with the origin of its child. Although you can change a bone’s length by clicking and dragging its tip, achieving perfect alignment using only the visual information in the viewport can be difficult.
Image

For precise placement, you currently need to determine the parent bone’s length first and then use that value as a reference when entering the child bone’s translation numerically. This process can be somewhat cumbersome.

It would be helpful to have a feature that snaps the parent bone’s tip to the child bone’s origin when adjusting length in the viewport, as well as a feature that snaps the child bone’s origin to the parent bone’s tip when translating it in setup mode.

Workaround:
The example above assumes that the parent bone’s tip and the child bone’s origin are not aligned from the beginning. However, you can avoid this situation by using one of the following methods:

  • After creating the parent bone using the Create tool, do not move the mouse cursor; create the child bone immediately.
  • After creating the parent bone, select either the local axis or parent axis and click the New... button at the bottom of the Tree View to create the next bone, then adjust its length afterward.
  • Assign a key to the New Bone hotkey. After creating the parent bone, press that key to create the child bone immediately, then adjust its length afterward.

When using this approach to keep the parent bone’s tip perfectly aligned with the child bone’s origin, you can hold the Alt key (Opt on macOS) while moving the tip. This ensures that the child bone remains correctly attached to the tip as it moves, eliminating the need to reposition it manually each time.

Related forum thread:
https://esotericsoftware.com/forum/d/29467-%EC%84%A0%ED%83%9D%EB%90%9C-%EB%BC%88%EC%9D%98-%EB%B0%A9%ED%96%A5%EA%B3%BC-%EA%B8%B8%EC%9D%B4%EB%A5%BC-%EB%8B%A4%EB%A5%B8-%EB%BC%88-%EC%9D%98-%EC%9C%84%EC%B9%98%EC%97%90-%EB%A7%9E%EC%B6%B0-%EC%88%98%EC%A0%95%ED%95%98%EA%B8%B0ik%EC%99%80-%EB%B9%84%EC%8A%B7%ED%95%98%EC%A7%80%EB%A7%8C-%EB%8B%A4%EB%A5%B8/4

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