It seems to be a plugin limitation, since I exported an alembic mesh from
Bifrost/maya with vorticity and velocity CAVs, if i import it back, the
data is still there. The same doesn't apply when i import the same mesh in
Softimage. :(
On Sat, Jul 5, 2014 at 12:52 AM, Jason S jasonsta...@gmail.com wrote:
So this is an in-out Alembic plugin for all SI versions?
This is good news, at least Autodesk is doing something good to help
smooth things out in a future transition.
Indeed! *and* in future multi-plaform environments!
Nuno you mentionned CAV's, but would that be a plugin limitation? or an
Alembic limitation?
(CAV's don't seem to be listed here
http://code.google.com/p/alembic/wiki/Alembic_Geometric_Types .. or
below)
Or can Alembic support custom properties?
Geometric types proposed in Alembic 1.0: Transform
The AbcGeom Transform class has these attributes:
- ops - One or more operations of translation, scale, rotation, or 4x4
Rotation is angle in degrees and axis of rotation. Operations can
optionally indicate a hint (e.g. for Maya to record hinting for pivot
behavior).
- inherits - Does this transform concatenate or ignore the transforms
of its parents
- childBounds - (optional) The bounding volume, including all
subobjects
Alembic uses a right handed coordinate system. Points
The AbcGeom Points class has these attributes:
- P - the positions of each point
- ids - for each P a 64bit unsigned integer that can be used to
identify a Point
- selfBounds - The bounding volume for just this object
- childBounds - The bounding volume, including all subobjects
- velocities - (optional) per point value is in units/second
Curves
The AbcGeom Curves class has these attributes:
- type - linear or cubic (for all curves in object)
- wrap - periodic or non-periodic (for all curves in object)
- P - vertices
- nVertices - for each curve the number of vertics in the curve
- width (optional) - can be constant or varying, expressed as a
diameter
- N - (optional) Normals
- uv - (optional) u-v coordinates
- velocities - (optional) per point value is in units/second
- selfBounds - The bounding volume for just this object
- childBounds - (optional) The bounding volume, including all
subobjects
PolyMesh
The Abc PolyMesh class has these attributes:
- faceCounts - for each face the count of vertices that make up the
face
- faceIndices - for each vertex of each face the slot in P for the
vertex
- P - vertices
- N - (optional) Normals
- uv - (optional) u-v coordinates
- selfBounds - The bounding volume for just this object
- childBounds - (optional) The bounding volume, including all
subobjects
- facesets - (optional) named sets of faces from this mesh
- velocities - (optional) per point value is in units/second
SubD
The Abc SubD class has these attributes:
- faceCounts - for each face, the count of vertices that make up the
face
- faceIndices - for each vertex the slot in P for the vertex's
coordinates
- P - vertex coordinates
- creases - (optional) creased edges
- corners - (optional) vertexes that are corners
- holes - (optional) regions to remove from the surface
- uv - (optional) u-v coordinates
- selfBounds - The bounding volume for just this object
- childBounds - (optional) The bounding volume, including all
subobjects
- facesets - (optional) named sets of faces from this subd
- velocities - (optional) value is in units/second
FaceSet
The Abc FaceSet class can be created as part of a SubD or PolyMesh and has
these attributes:
- faceNumbers - the faces from the SubD or PolyMesh that are in this
faceset
NuPatch
The Abc NuPatch class has these attributes:
- nucvs - the number of CVs in the u direction
- nvcvs - the number of CVs in the v direction
- uorder - the order of the patch in the u direction
- vorder - the order of the patch in the v direction
- uknot - floating point array containing the number of knots in the u
direction
- vknot - floating point array containing the number of knots in the v
direction
- Parameter lists (N, P, uv, arbparams)
- selfBounds - The bounding volume for just this object
- childBounds - (optional) The bounding volume, including all
subobjects
- velocities - (optional) per point value is in units/second
Additionally, the NURBS objects will contain TrimCurves which may contain
zero or more trim curves. The path is composed of segments in the u
direction and then the v direction.
Camera
The Abc Camera class has these attributes:
- focalLength (mm)
- horizontalAperture/verticalAperture dimensions (cm)
- horizontalFilmOffset/verticalFilmOffset (cm)
- lenseSqueezeRatio: to handle anamorphic lenses, among other things.
(width / height)
- 2D
