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866 Chapter 22: Customizing the User Interface

object to be considered a valid solution. The value

represents a distance in the current display unit

system. Small values increase accuracy but t a ke

longer to solve.

Rotation—Sets how accurately the end effector has

to match the orientation of the follow object to be

considered a valid solution. The value represents

a rotation angle in degrees. 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

thechancethat3dsMaxcancalculateavalid

IK solution, but the calculation takes longer to

complete.

Ungrouped controls

Use Secondar y Threshol d—Compares the second

derivative of the

end effector (page 3–1027)

to a

very small threshold. If t he derivative is within the

threshold, IK is terminated.

Always Transform Children Of The World—Applies

when IK is turned on in both move and rotate

mode. It affects only an object that’s a direct child

of the world when the object is selected.

For example, if the root of an IK chain is a child

of the world, and you’re manipulating an object

at the end of the chain (the root object itself isn’t

selected), any constraints set for t he root object

wi ll be observed. However, if you select the root

object and try to move it, its constraints will be

ignored.

Radiosity Preferences

Customize m enu > Preferences > Preference Settings

dialog > Radiosity tab

On the Radiosity panel of the Preference Settings

dialog, you set options for the

radiosity solution

(page 3–50)