Abstract: Computer-implemented detail propagation in a CAD model is disclosed. A detail and a reference base set comprising N?1 reference base solids are obtained via user selection. A detail volume to be replicated, encompassing the detail, is automatically computed. The detail volume comprises a surface and for each reference base solid a reference intersection curve of the surface and the reference base solid. A candidate base set comprising N candidate base solids comprising properties compatible with the reference base solids is automatically searched for. The detail volume is automatically mapped onto the candidate base set via a transformation. The mapping of the detail volume is automatically validated via the reference intersection curves. The detail volume is replicated, or replicating of the detail volume is suggested to a user via a visualization means, to replace the corresponding volume at the candidate base set according to the validated mapping.

Abstract: A CAD model represents a structure and comprises a plurality of physical elements. For each of multiple physical elements, an analytical element is generated. One or more connection nodes each associated with two or more analytical elements and comprising an initial spatial configuration are generated. At least one analytical element associated with a connection node is not tangent to the connection node. New spatial configurations for all analytical elements and all connection nodes are computed simultaneously to make analytical elements associated with a connection node tangent to said connection node. In an embodiment, the new spatial configurations may be computed simultaneously via optimization of a cost function based on the spatial configurations of the analytical elements and connection nodes. In an embodiment, a representation of the analytical model may be automatically displayed to a user via a GUI.

Abstract: A region of a CAD model is obtained via user drawing of a boundary for the region in a GUI. The boundary entirely encloses one or more entities and intersects one or more entities. For each intersecting entity, a reference point on the intersecting entity and a reference direction at the reference point are determined. Based on the reference points and reference directions, a candidate set of candidate entities which are spatially compatible with the intersecting entities is searched. A spatial transformation which maps each reference point and reference direction onto a candidate entity of the candidate set is computed. The one or more entirely enclosed entities are replicated according to the spatial transformation, or replication is suggested via a visualization means. In an embodiment, the CAD model is two-dimensional, the intersecting entities are curves, and the reference direction of an intersecting curve is tangent to the intersecting curve.

Abstract: A CAD model comprises a set of at least three subentities. A candidate set of pairwise numerical constraints is obtained for the set of subentities, such that a first graph, representing the subentities of the set of subentities as nodes and the pairwise numerical constraints of the candidate set as edges, is connected. A minimal spanning subset of pairwise numerical constraints is obtained from the candidate set, such that a second graph, representing the subentities of the set of subentities as nodes and the pairwise numerical constraints of the minimal spanning subset as edges, is a spanning tree. A parameter set to parameterize the pairwise numerical constraints of the minimal spanning subset is determined. The parameter set and parametric constraints, based on the parameter set and the numerical values of the numerical constraints of the minimal spanning subset, are added to the CAD model.

Abstract: The current invention concerns a computer-implemented method, a computer system, and a computer program product for the semantic classification of an entity in a building information model (BIM). The BIM comprises multiple target entities. Update data is obtained. For each target entity, geometric information about the target entity is obtained from the BIM. For each target entity, an initial probability distribution of semantic classification is determined based on the obtained geometric information about the target entity. Relative geometric information about the target entities is obtained from the BIM. For each target entity, an updated probability distribution of semantic classification is determined based on the obtained relative geometric information, the initial probability distributions of all target entities, and the update data. For each target entity, a semantic classification is selected based on the updated probability distribution of the target entity.

Abstract: A CAD model comprises multiple entities. Each entity comprises one or more subentities, wherein a subentity is a vertex, an edge or a face. From the CAD model a group of multiple entities comprising an identical geometry is obtained. This step comprises verifying whether the entities of a pair of entities comprise an identical geometry via sequentially verifying identity conditions of a sequence of multiple identity conditions, until either an identity condition of the sequence fails or all identity conditions of the sequence are verified. Each identity condition is based on the subentities of the pair of entities. A block definition comprising a block geometry based on said identical geometry is created. In the CAD model, the entities of the group are replaced with block references comprising a pointer to the block definition. The CAD model is thereby compressed.

Abstract: The current invention concerns a method, a system, and a computer program product for suggesting a detail in a building information model. Based on an initial identification of a detail in relation to two construction elements in a building information model, the invention provides for suggesting to include the detail in relation to another pairs of elements with partially or fully corresponding properties. Based at least in part on acceptance or refusal, a module based on artificial intelligence is trained in order to decide for further pairs of elements whether to suggest inclusion of the detail.

Abstract: A CAD model comprises a set of at least three subentities. A candidate set of pairwise numerical constraints is obtained for the set of subentities, such that a first graph, representing the subentities of the set of subentities as nodes and the pairwise numerical constraints of the candidate set as edges, is connected. A minimal spanning subset of pairwise numerical constraints is obtained from the candidate set, such that a second graph, representing the subentities of the set of subentities as nodes and the pairwise numerical constraints of the minimal spanning subset as edges, is a spanning tree. A parameter set to parameterize the pairwise numerical constraints of the minimal spanning subset is determined. The parameter set and parametric constraints, based on the parameter set and the numerical values of the numerical constraints of the minimal spanning subset, are added to the CAD model.

Abstract: Computer-implemented detail propagation in a CAD model is disclosed. A detail and a reference base set comprising N?1 reference base solids are obtained via user selection. A detail volume to be replicated, encompassing the detail, is automatically computed. The detail volume comprises a surface and for each reference base solid a reference intersection curve of the surface and the reference base solid. A candidate base set comprising N candidate base solids comprising properties compatible with the reference base solids is automatically searched for. The detail volume is automatically mapped onto the candidate base set via a transformation. The mapping of the detail volume is automatically validated via the reference intersection curves. The detail volume is replicated, or replicating of the detail volume is suggested to a user via a visualization means, to replace the corresponding volume at the candidate base set according to the validated mapping.

Abstract: The present invention concerns a computer-implemented method, a computer system and a computer program product for direct room modeling in a CAD model. The CAD model comprises a rectangular coordinate system comprising mutually orthogonal height, first horizontal and second horizontal directions. A first position and subsequently a second position within the model are obtained via a user input device. The first and second positions define a rectangle perpendicular to the height direction and aligned with the horizontal directions. The rectangle comprises edges and corners. The rectangle comprises the first and second positions at diagonally opposite corners. A room drawing operation is automatically performed based on the rectangle. One or more walls and/or wall portions, each extending in the height direction and along an edge of the rectangle over in essence the full length of the edge, are thereby inserted or removed.

Abstract: A region of a CAD model is obtained via user drawing of a boundary for the region in a GUI. The boundary entirely encloses one or more entities and intersects one or more entities. For each intersecting entity, a reference point on the intersecting entity and a reference direction at the reference point are determined. Based on the reference points and reference directions, a candidate set of candidate entities which are spatially compatible with the intersecting entities is searched. A spatial transformation which maps each reference point and reference direction onto a candidate entity of the candidate set is computed. The one or more entirely enclosed entities are replicated according to the spatial transformation, or replication is suggested via a visualization means. In an embodiment, the CAD model is two-dimensional, the intersecting entities are curves, and the reference direction of an intersecting curve is tangent to the intersecting curve.

Abstract: A CAD model represents a structure and comprises a plurality of physical elements. For each of multiple physical elements, an analytical element is generated. One or more connection nodes each associated with two or more analytical elements and comprising an initial spatial configuration are generated. At least one analytical element associated with a connection node is not tangent to the connection node. New spatial configurations for all analytical elements and all connection nodes are computed simultaneously to make analytical elements associated with a connection node tangent to said connection node. In an embodiment, the new spatial configurations may be computed simultaneously via optimization of a cost function based on the spatial configurations of the analytical elements and connection nodes. In an embodiment, a representation of the analytical model may be automatically displayed to a user via a GUI.

Abstract: The present invention concerns a computer-implemented method, a computer system and a computer program product for direct room modeling in a CAD model. The CAD model comprises a rectangular coordinate system comprising mutually orthogonal height, first horizontal and second horizontal directions. A first position and subsequently a second position within the model are obtained via a user input device. The first and second positions define a rectangle perpendicular to the height direction and aligned with the horizontal directions. The rectangle comprises edges and corners. The rectangle comprises the first and second positions at diagonally opposite corners. A room drawing operation is automatically performed based on the rectangle. One or more walls and/or wall portions, each extending in the height direction and along an edge of the rectangle over in essence the full length of the edge, are thereby inserted or removed.

Abstract: The current invention concerns a computer-implemented method, a computer system, and a computer program product for the semantic classification of an entity in a building information model (BIM). The BIM comprises multiple target entities. Update data is obtained. For each target entity, geometric information about the target entity is obtained from the BIM. For each target entity, an initial probability distribution of semantic classification is determined based on the obtained geometric information about the target entity. Relative geometric information about the target entities is obtained from the BIM. For each target entity, an updated probability distribution of semantic classification is determined based on the obtained relative geometric information, the initial probability distributions of all target entities, and the update data. For each target entity, a semantic classification is selected based on the updated probability distribution of the target entity.

Abstract: The current invention concerns a method, a system, and a computer program product for suggesting a detail in a building information model. Based on an initial identification of a detail in relation to two construction elements in a building information model, the invention provides for suggesting to include the detail in relation to another pairs of elements with partially or fully corresponding properties. Based at least in part on acceptance or refusal, a module based on artificial intelligence is trained in order to decide for further pairs of elements whether to suggest inclusion of the detail.