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Application module:
Layered 3D shape |
ISO/TS 10303-1694:2010-03(E)
© ISO
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This clause specifies the information requirements for the
Layered 3D shape
application module. The information requirements are specified as the
Application Reference Model (ARM) of this application module.
NOTE 1 A graphical representation of the information
requirements is given in
Annex C.
NOTE 2 The mapping specification is specified in
5.1. It shows how
the information requirements are met by using common resources and
constructs defined or imported in the MIM schema of this application
module.
The following EXPRESS specification begins the
Layered_3d_shape_arm
schema and identifies the necessary external references.
EXPRESS specification:
*)
SCHEMA Layered_3d_shape_arm;
(*
The following EXPRESS interface statements specify the elements
imported from the ARMs of other application modules.
EXPRESS specification:
*)
USE FROM
Layered_2d_shape_arm;
--
ISO/TS 10303-1693
USE FROM
Physical_unit_3d_shape_arm;
--
ISO/TS 10303-1727
USE FROM
Advanced_boundary_representation_arm;
--
ISO/TS 10303-1514
USE FROM
Curve_swept_solid_arm;
--
ISO/TS 10303-1659
USE FROM
Geometrically_bounded_surface_arm;
--
ISO/TS 10303-1507
USE FROM
Geometric_model_2d_3d_relationship_arm;
--
ISO/TS 10303-1404
(*
NOTE 1
The schemas referenced above are specified in the following
part of ISO 10303:
| Layered_2d_shape_arm |
ISO/TS 10303-1693 |
| Physical_unit_3d_shape_arm |
ISO/TS 10303-1727 |
| Advanced_boundary_representation_arm |
ISO/TS 10303-1514 |
| Curve_swept_solid_arm |
ISO/TS 10303-1659 |
| Geometrically_bounded_surface_arm |
ISO/TS 10303-1507 |
| Geometric_model_2d_3d_relationship_arm |
ISO/TS 10303-1404 |
NOTE 2
See Annex C,
Figures
C.1and C.2
for a graphical representation of this schema.
This subclause specifies the ARM types
for this application module. The ARM types and
definitions are specified below.
The l3ds_feature_or_non_feature_usage type is an extension
of the
feature_or_non_feature_usage type.
It adds the data
type
part_template_or_physical_unit_3d_shape_model_select
to the list of alternate data types.
NOTE The list of entity data types may be
extended in application modules that use the constructs of
this module.
EXPRESS specification:
*)
TYPE
l3ds_feature_or_non_feature_usage =
EXTENSIBLE
GENERIC_ENTITY
SELECT
BASED_ON
feature_or_non_feature_usage
WITH
(part_template_or_physical_unit_3d_shape_model_select);
END_TYPE;
(*
The part_template_or_physical_unit_3d_shape_model_select type is an
extensible list of alternate data types
that allows for the designation of the data
type
Physical_unit_3d_shape_model.
NOTE
The list of entity data types may be
extended in application modules that use the constructs of
this module.
EXPRESS specification:
*)
TYPE
part_template_or_physical_unit_3d_shape_model_select =
EXTENSIBLE
GENERIC_ENTITY
SELECT
(Physical_unit_3d_shape_model);
END_TYPE;
(*
This subclause specifies the ARM entities for this
module. Each ARM application entity is an atomic element that
embodies a unique application concept and contains attributes
specifying the data elements of the entity. The ARM
entities and definitions are specified below.
A Shape_definition_3d_intersection is a type of
Geometric_model_relationship.
A Shape_definition_3d_intersection is the transformation of a shape in a plane in a three dimensional model
into a two dimensional model based on the location and orientation of the plane in the three dimensional model.
The shape in the plane in the three dimensional model is based on the intersection of that plane with the three-dimensional
shape.
The placement of the plane in the three dimensional model is the source of the transformation and the origin of the two
dimensional coordinate system is the target of the transformation.
EXPRESS specification:
*)
ENTITY Shape_definition_3d_intersection
SUBTYPE OF (Geometric_model_relationship);
orientation_intersection_plane : Axis_placement_3d;
planar_shape_origin : Axis_placement_2d;
SELF\Geometric_model_relationship.rep_1 RENAMED projected_volume : Geometric_model;
SELF\Geometric_model_relationship.rep_2 RENAMED surface_intersection_result : Planar_shape_model;
WHERE
WR1: NOT ('LAYERED_2D_SHAPE_ARM.PLANAR_SHAPE_MODEL' IN TYPEOF(projected_volume));
WR2: NOT EXISTS(SELF\Representation_relationship.relation_type);
END_ENTITY;
(*
Attribute definitions:
orientation_intersection_plane:
specifies the role of the
Axis_placement_3d
for the Shape_definition_3d_intersection.
The Z axis of the
Axis_placement_3d
shall define the normal of the plane.
The orientation_intersection_plane is the source item for the transformation.
planar_shape_origin:
specifies the role of the
Axis_placement_2d
for the Shape_definition_3d_intersection.
The
Axis_placement_2d
shall define the two dimensional coordinate system that is the result of the intersection transform.
The orientation_intersection_plane is the target item for the transformation
projected_volume:
specifies the role of the
Geometric_model
for the Shape_definition_3d_intersection.
surface_intersection_result:
specifies the role of the
Planar_shape_model
for the Shape_definition_3d_intersection.
Formal propositions:
WR1:
The projected_volume shall not be a
Planar_shape_model.
WR2:
The
relation_type
shall not be populated.
A Shape_definition_3d_plane_projection is a type of
Geometric_model_relationship.
A Shape_definition_3d_plane_projection is the orthogonal projection of a three-dimensional solid onto a plane in a three dimensional coordinate system, resulting
in a set of points on that plane,
followed by the transformation of that set of points into corresponding points in a two dimensional coordinate system. The
normal of the plane shall point toward the solid.
The interpretation of the transform shall be that the local x,y position of each point in the plane in the three dimensional
coordinate system is used as the x,y position of the corresponding point in
the two dimensional coordinate system.
The local x,y position of a point in the plane is defined to be the position of the point with respect to the intersectioon
of the x,y axes of the placement of the plane in the three dimensional coordinate system.
Scaling or other shape distortion is not permitted.
EXPRESS specification:
*)
ENTITY Shape_definition_3d_plane_projection
SUBTYPE OF (Geometric_model_relationship);
viewing_plane : Axis_placement_3d;
planar_shape_origin : Axis_placement_2d;
SELF\Geometric_model_relationship.rep_1 RENAMED surface_projection_result : Planar_shape_model;
SELF\Geometric_model_relationship.rep_2 RENAMED projected_volume : Geometric_model;
WHERE
WR1: NOT ('LAYERED_2D_SHAPE_ARM.PLANAR_SHAPE_MODEL' IN TYPEOF(projected_volume));
WR2: NOT EXISTS(SELF\Representation_relationship.relation_type);
END_ENTITY;
(*
Attribute definitions:
viewing_plane:
specifies the role of the
Axis_placement_3d
for the Shape_definition_3d_plane_projection.
planar_shape_origin:
specifies the role of the
Axis_placement_2d
for the Shape_definition_3d_plane_projection.
surface_projection_result:
specifies the role of the
Planar_shape_model
for the Shape_definition_3d_plane_projection.
projected_volume:
specifies the role of the
Geometric_model
for the Shape_definition_3d_plane_projection.
Formal propositions:
WR1:
The projected_volume shall not be a
Planar_shape_model.
WR2:
The
relation_type
shall not be populated.
This subclause specifies the ARM subtype constraint for
this module. The subtype constraint places a constraint on the
possible super-type / subtype instantiations.
The ARM subtype constraint and definition is
specified below.
The
l3ds_geometric_representation_relationship_subtypes
constraint specifies a constraint that applies to instances of subtypes of
Geometric_model_relationship.
EXPRESS specification:
*)
SUBTYPE_CONSTRAINT l3ds_geometric_representation_relationship_subtypes FOR Geometric_model_relationship;
ONEOF (Shape_definition_3d_intersection,
Shape_definition_3d_plane_projection);
END_SUBTYPE_CONSTRAINT;
(*
*)
END_SCHEMA; -- Layered_3d_shape_arm
(*
© ISO 2009 — All rights reserved
