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From Odwiki

The PreTransformCHOP, it's used to take transform channels and compensate by the pre-transform before overriding the target object's transform values.

Uses of the PreTransformCHOP

In the help of PreTransform it says "A combination of Object, PreTransform, and Export CHOPs can be used to perform orientation constraints in objects." this is the combination.

• Create an object CHOP make the "Target Object" the path of the object with the orientation you are trying to apply, make the "Reference Object" the path of the bone that is the parent of the bone that is receiving the orientation.
• Append a Pre-Transform chop and set its "Object" the path of the bone that is receiving the orientation.
• Finally add an export CHOP, "Channels" = r[xyz] "Node" = path of the bone that is receiving the orientation, and the "Path" = r[xyz]

Q: Is there a place when I can find some info on Pre-Transforms, the Pre-Transform menu of Objects and the PreTransformCHOP? The help isn't very helpful on this.

EdwardLam: Think of the pre-transform as an extra invisible null object as the parent of the transform parameters in objects. Its purpose is to allow you to do in what some packages call "freeze transform". It sets your transform parameters back to their default values without actually changing the world space transform itself. This is accomplished by changing the pre-transform to accomodate the new default transform values. As for the PreTransformCHOP, it's used to take transform channels and compensate by the pre-transform before overriding the target object's transform values.

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