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Controlling IK Precision (HD Solver) 463

• If you unbind an object, it permanently

removes the binding to a follow object.

Controlling IK Precision (HD

Solver)

Even with carefully defined joint precedence and

joint par ameters there are m any valid IK solutions

for any placement of an end effector. You set

position and rotation thresholds to control IK

precision and solution speed.

• The threshold and iteration settings are found

on the Motion panel on the IK Con troller

Parameters Rollout, when the end effector is

selected.

• The threshold and iteration sett i ngs for the HD

solver are also found on the Inverse Kinematics

tab of the Customize > Preferences dia log.

Position Thr eshold—Sets how close the end effector

has to get to the follow object or cursor position to

be considered a valid s olution. The value expresses

a distance in the current unit system. Small values

increase accuracy but take longer to solve.

Rotation Thr eshold—Sets how accurately the end

effector has to match the orientation of the follow

object to be considered a valid solution. The value

expresses a rotat ion ang le in deg rees. Small va lues

increase accuracy but take longer to solve.

Iterations—Sets the maximum number of times

3ds Max repeats the IK calculations to find a

valid solution. A high Iterations value increases

thechancethatthesoftwarecancalculateavalid

solution, but takes longer to complete. The

following rules apply:

• Calculationsstopassoonasavalidsolution

is found, even if the maximum number of

iterations have not been per formed.

• The last solution calculated is used if the

maximum number of iterations is reached,

regardless of whether the solution satisfies the

position and rotation thresholds.

Setting A pplied and Interactive

Thresholds

You set the threshold and iterations settings a s a

trade-off between accuracy and speed. You have

twogroupsofsettingssoyoucanindividuallytune

the behavior of applied IK and interactive IK.

• Use interactive IK if you want fast, real-time

response. Your interactive IK preferences

should be set for speed.

• Use applied IK if you want the solution to match

the follow objects very closely. Your Applied IK

preferences should be set for accuracy.

The default applied IK and interactive IK settings

are shown in the following table:

Thresholds Applied IK Interactive I K

Position

0.100 1.000

Rotation

0.100 1.000

Iterations

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