mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
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Dion Moult
f7add7f412
When the user adds a model into a fresh, untitled federation that still
has the default (0,0,0, no rotation) FederatedFalseOrigin, derive an
origin from the first instance's placement_transformation (lifted
through CoordinateOperation when enabled) and the helmert grid-north
baked into ModelGeoref::coordinate_operation_meters. Multi-file batches
naturally settle: whichever load finishes first anchors the federation,
the rest see a non-default origin and skip. Saved .ifcfeds keep their
authoritative origin.
Adds Placement.{h,cpp} (port of util/placement.py — a2p,
get_axis2placement, get_local_placement) so Geolocation no longer needs
its own anonymous getAxis2Placement, and xaxis2angleDeg in Geolocation
mirroring util/geolocation.xaxis2angle.
SceneLoader captures the first instance's placement_transformation from
either the sidecar's InstanceCpu[0] or the streamer's first
InstanceChunk, so the guess works on both load paths without re-reading
the IFC.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
51 lines
2.8 KiB
C
51 lines
2.8 KiB
C
/********************************************************************************
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* *
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* This file is part of IfcOpenShell. *
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* *
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* IfcOpenShell is free software: you can redistribute it and/or modify *
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* it under the terms of the Lesser GNU General Public License as published by *
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* the Free Software Foundation, either version 3.0 of the License, or *
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* (at your option) any later version. *
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* *
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* IfcOpenShell is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* Lesser GNU General Public License for more details. *
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* *
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* You should have received a copy of the Lesser GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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* *
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********************************************************************************/
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// Port of selected helpers from
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// src/ifcopenshell-python/ifcopenshell/util/placement.py — entity-instance
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// placement chains -> 4x4 matrices, used by callers that need to read
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// IfcLocalPlacement / IfcAxis2Placement* outside of the geometry kernel.
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#ifndef PLACEMENT_H
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#define PLACEMENT_H
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#include "../ifcparse/express.h"
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#include <Eigen/Dense>
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// Build a 4x4 placement matrix from an origin + Z + X axis triple, mirroring
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// ifcopenshell.util.placement.a2p. The Y axis is derived as Z × X. Inputs
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// don't need to be unit; vectors are renormalised internally.
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Eigen::Matrix4d a2p(const Eigen::Vector3d& origin,
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const Eigen::Vector3d& z,
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const Eigen::Vector3d& x);
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// IfcAxis2Placement{2D,3D,Linear} / IfcAxis1Placement -> 4x4 matrix. Mirrors
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// ifcopenshell.util.placement.get_axis2placement. Returns identity for null
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// or unparseable inputs. Translation is in the IFC's project length unit.
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Eigen::Matrix4d getAxis2Placement(const express::Base& placement);
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// Resolve an IfcLocalPlacement (or an IfcAxis2Placement* directly) into a
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// 4x4 matrix in the IFC project's length unit, walking the PlacementRelTo
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// chain. Mirrors ifcopenshell.util.placement.get_local_placement. Returns
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// identity for a null input.
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Eigen::Matrix4d getLocalPlacement(const express::Base& placement);
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#endif // PLACEMENT_H
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