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1140 Chapter 14: character studio
Joint Inter sections Rollout
Selec t a mesh that has the Physique modifier applied
to it. > Modify panel > Link sub-object level > Joint
Intersections rollout
Whenajointbends,theskincan"collide."Without
collision detection, it can overlap unrealistically.
This is especia l ly likely when one or both of the
links have bulges. The joint intersection controls
can detect skin collisions and correct overlap by
creasing the skin.
By default, Physique draws a crease plane that
bisects the joint and prevents vertices f rom each
linkfromcrossingthecreaseplane.Theresultcan
be a somewhat unnatural flattening of the bulges
along the plane. Physique therefore provides
controls that let you modify the effect of the crease
plane.
Properly adjusted crease plane
Youcanmodifytheeffectofthejointcreasesat
both ends of the sele cted li nk. These joints are the
parent’s joint and the link ’s joint.BlendFromand
Blend To points define the distance along the link
that is affected by the crease plane.
• The parent’s joint is between the selected link
and its parent. The parent ’s joint is numbered 0.
For the parent joint, the joint is at 0.0 and the
crease plane has an effect from the joint to
the Blend From point. Between Blend From
and Blend To, the crease plane has a partial
effect, adjusted by the Bias setting. Vertices at
locations greater than the Blend To point ar e
not affected by the crease plane.
• The link’s joint is between the selected link and
itschild.Thelink’sjointisnumbered1.
For the link’s joint, the joint is at 1.0 and the
crease plane has an effect from the joint to
the Blend To point. Between Blend To and
Blend From, the crease plane has a partial
effect, adjusted by the Bias setting. Vertices at
locationslessthantheBlendFrompointarenot
affectedbythecreaseplane.
Procedure
To adjust joint intersection parameters:
1.
With Physique active on the Modify panel, go
to the Link sub-object level.
2. In a viewport, click the link you want to work
with.
3. Select Active for the crease you want to
manipulate:chooseCreaseAtParent’sJointor
Crease At Link’s Joint.
4. Change settings on the Physique Joint
Intersections rollout.
5. Select the opposite link and adjust the opposite
set of joint intersection parameters.
For example, if you are working with the joint
between the selected link and its child (such as
thebicepslink),turnonActiveforCreaseAt
Link’s Joint and change settings. Then select the
childlink(theforearm)andactivateitsCreaseAt
Parent’s Joint. Adjustments to the Parent’s Joint for
this lin k affect the other side of the same crease.