World Space
This is the space that an object is in after having all of its transformations
applied to it. A world space transformation is the the very last
transformation that would be applied to the object.
Object Space
This is the space that an object is defined in. An object space transformation
would be the first transformation that was be applied to an object. This is
the same as pre-transform space.
Post Transform Space
This is the space in which the object lives after having the transformations of
its transform node applied. For example, when a primitive object is created in
Maya, there is a shape node which defined the geometry and a transform node
which positions/orients the geometry. The space that the geometry is in is
object space. After applying the transformations of the transform node to the
geometry, the transformed geometry is in post transform space.
Transform Space
This space depends on the type of transformation being applied. Transform nodes
define a fixed sequence of affine transformations. Basically, there is scale
followed by rotation and finally translation. There are four spaces here:
1) the space before applying the scale
2) the space after the scale but before the rotation
3) the space between the rotation and translation and
4) the space after the translation.
Space 1) is pre-transform space.
Space 4) is post-transform space.
Spaces 2) and 3) define transform spaces.
If applying a transform space scale, this transform will be applied after the
current scale but before the rotation (space 2). If applying a transform space
rotation, this transform will be applied after the current rotation but before
the translation. Applying a translation in transform space, the translation
will be applied after the current translation.
Partager