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2018-06-28T20:48:53Z

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wiki>Terrywallwork: Reorganised Stretch to constraint doc

2012-04-18T08:52:54Z

Reorganised Stretch to constraint doc

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{{Page/Header|2.5|Doc:2.5/Manual/Constraints/Tracking/Spline IK|Doc:2.5/Manual/Constraints/Tracking/Track To}}

= Stretch To Constraint =
== Description ==
The {{Literal|Stretch To}} constraint causes its owner to rotate and scale its Y axis towards its target. So it has the same tracking behavior as the [[Doc:2.6/Manual/Constraints/Tracking/Track To|{{Literal|Track To}} constraint]]. However, it assumes that the Y axis will be the tracking and stretching axis, and doesn’t give you the option of using a different one.

It also optionally has some raw volumetric features, so the owner can squash down as the target moves closer, or thin out as the target moves farther away. Note however that it is not the real volume of the owner which is such preserved, but rather the virtual one defined by its scale values. Hence, this feature is working even with non-volumetric objects, like empties, 2D meshes or surfaces, curves.

With bones, the “volumetric” variation scales them along their own local axes (remember that the local Y axis of a bone is aligned with it, from root to tip).
{{clr}}

== Options ==
[[File:25-Manual-Constraints-Tracking-StretchTo.png|thumb|{{Literal|Stretch To}} panel for a Mesh Object]]
; {{Literal|Target}} (Mesh Object Type)
: This constraint uses one target, and is not functional (red state) when it has none.

:; {{Literal|Vertex Group}}: When {{Literal|Target}} is a mesh, a new field is display where a vertex group can be selected.{{clr}}

[[File:Manual-Constraints-Tracking-StretchTo-Armature.png|thumb|{{Literal|Stretch To}} panel for a Armature Object]]
; {{Literal|Target}} (Armature Object Type)
: This constraint uses one target, and is not functional (red state) when it has none.

:; {{Literal|Bone}}: When {{Literal|Target}} is an armature, a new field for a bone is displayed.

:; {{Literal|Head/Tail}}: When using a Bone {{Literal|Target}}, you can chose where along this bone lays the target point.

; {{Literal|Rest Length}}: This numeric field sets the rest distance between the owner and its target, i.e. the distance at which there is no deformation (stretching) of the owner.

:; {{Literal|Reset}}: When clicked, this small button will recalculate the {{Literal|Rest Length}} value, so that it corresponds to the actual distance between the owner and its target (i.e. the distance before this constraint is applied).

; {{Literal|Volume Variation}}: This numeric field controls the amount of “volume” variation proportionally to the stretching amount. Note that the '''0.0''' value is not allowed, if you want to disable the volume feature, use the {{Literal|None}} button (see below).

; {{Literal|Volume}}: These buttons control which of the X and/or Z axes should be affected (scaled up/down) to preserve the virtual volume while stretching along the Y axis.
: If you enable the {{Literal|NONE}} button, the volumetric features are disabled.

; {{Literal|Plane}}: These buttons are equivalent to the ''Up'' ones of the [[Doc:2.6/Manual/Constraints/Tracking/Track To|Track To constraint]]: they control which of the X or Z axes should be maintained (as much as possible) aligned with the global Z axis, while tracking the target with the Y axis.
{{clr}}

{{Page/Footer|Doc:2.5/Manual/Constraints/Tracking/Spline IK|Doc:2.5/Manual/Constraints/Tracking/Track To}}

[[Category:Constraints]]

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wiki>Terrywallwork: Reorganised Stretch to constraint doc

Yamyam: 1版をインポートしました