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
.. 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 transform stack
(translate/scale only) for expressing additional 2D
translate/scale filmback operations
- overscan stored as 4
percentage values for independent left/right/top/bottom
values (to support fractional extension of screen window)
- non-symmetrical
overscan, which we've come across)
- fStop (focal length
divided by "effective" lens diameter)
- focusDistance
- shutterOpen/shutterClose:
these would be frame-relative values, in seconds (secs.)
- near/far clipping
planes
Light
The attributes of the Abc
Light class are to be expressed via an attached AbcMaterial. The other optional
attributes on the light include:
- childBounds -
(optional) The bounding volume, including all subobjects
- camera - (optional) An
Abc Camera.
On 07/04/14 12:13, Nuno Conceicao wrote:
