Softimage Creative Environment was adopted by major visual effects studios like Industrial Light & Magic and Digital Domain for use in their production pipelines, which also typically included software from Alias Research, Big Idea Productions, Kroyer Films, Angel Studios, Walt Disney Feature Animation Inc., and Pixar Animation Studios Inc. The software was initially demonstrated at SIGGRAPH in 1988 and was released for Silicon Graphics workstations the following year as the Softimage Creative Environment™.
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When the chain is extended to its full length, translating the effector toward the root causes the chain to bend in one direction.īecause unpredictable behavior can occur when you use IK, this method is really only practical for FK and is the option forĭoing "pose-to-pose" animation.In 1986, National Film Board of Canada filmmaker Daniel Langlois, in partnership with software engineers Richard Mercille and Laurent Lauzon, began developing an integrated 3D modeling, animation, and rendering package with a graphical interface targeted at visual artists. If you manipulate the chain in FK, and then IK, the chain won't snap back to its preferred angle. Reuse Joint Rotation at Every Resolution Step ignores the preferred angles and calculates rotation values based on the joints' current angles (it keeps bending the direction The only way to stay in this joint rotation mode and change the preferred angle is to do so from the Kinematic Joint propertyĮditor (see Changing the Joint's Preferred Angle - you can see the result of doing so if Force IK is on). IK has priority over FK with this method: FK only modifies the preferred angles of the bones, and the IK will always bend Them, meaning that the joint rotations are always predictable a given effector position always results in the same rotation The preferred angles in the bones stay at what you set Use Preferred Rotations from Joint Properties calculates rotation values based on the joints' preferred angles. Otherwise, expressions take precedence overĬhanges you make by directly manipulating the chain (transforming it), and direct manipulation changes takes precedence overįcurves (or other local orientation control). If a subchain is to be solved in IK, expressions on this subchain are ignored. IK and FK have the same priority with this method, which means that the IK may be slightly This is the same behavior as in SOFTIMAGE|3D, and chains imported from SOFTIMAGE|3DĪutomatically assume this behavior. Which will affect further IK joint calculations. Use Joint Rotations (SI|3D Behavior) updates the preferred angles when the joint angles are changed by any means other than IK (such as by bone rotation - FK),
For more information, see Preferred Angles.Ĭhoose one of three Solver Angle methods for calculating joint rotations when using IK: Reading those angles, the solver computes a solution that depends on theseĪngles and the goal position (as well as any up-vector or preferred axis constraints). When you use IK, these preferred angles are used as an initial solution for the IK solver. When you draw a chain, the angles at each joint are seen as the "home state", known as the preferred angles, of the chain. If you're working exclusively in Softimage, you may find this solver more efficient.Ĭalculating Joint Rotations with the Solver Angle The chain more effectively than the SI|3D solver. Or didn't exist in SOFTIMAGE|3D (such as joint stiffness, pseudo-roots, and bone rolls). Softimage architecture, it works better with elements that are different from (rotation limits and up-vector constraints)
The XSI Solver uses an algorithm that usually provides quick results when translating the effector.
That you want to import into Softimage, you should use this solver to be sure that the angles are calculated the same way The SI|3D Solver uses the same algorithm as in SOFTIMAGE|3D to provide compatibility with that program. (click its animation icon) to animate the switching from one solver to the other at specific frames. If youįind that different solvers work best for different situations on the same chain, you can even set keys on the Solver options Whichever solver you choose, it's easy to switch between them. You can choose to use either the SI|3D or XSI Solver.
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