First Commit
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# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2025 Thomas Krijnen <thomas@aecgeeks.com>
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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 GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 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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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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import numpy as np
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import ifcopenshell
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import ifcopenshell.geom
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from ifcopenshell import entity_instance, ifcopenshell_wrapper
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def evaluate_representation(shape_rep: entity_instance, dist_along: float) -> np.ndarray:
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"""
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Calculate the 4x4 geometric transform at a point on an alignment segment
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:param shape_rep: The representation shape (composite curve, gradient curve, or segmented reference curve) to evaluate
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:param dist_along: The distance along this representation at the point of interest (point to be calculated)
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"""
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supported_rep_types = ["IFCCOMPOSITECURVE", "IFCGRADIENTCURVE", "IFCSEGMENTEDREFERENCECURVE"]
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shape_rep_type = shape_rep.is_a().upper()
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if not shape_rep_type in supported_rep_types:
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raise NotImplementedError(
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f"Expected entity type to be one of {[_ for _ in supported_rep_types]}, got '{shape_rep_type}"
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)
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# TODO: confirm point is not beyond limits of alignment
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s = ifcopenshell.geom.settings()
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function_item = ifcopenshell_wrapper.map_shape(s, shape_rep.wrapped_data)
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evaluator = ifcopenshell_wrapper.function_item_evaluator(s, function_item)
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trans_matrix = evaluator.evaluate(dist_along)
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return np.array(trans_matrix, dtype=np.float64).T
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def evaluate_segment(segment: entity_instance, dist_along: float) -> np.ndarray:
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"""
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Calculate the 4x4 geometric transform at a point on an alignment segment
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:param segment: The segment containing the point that we would like to
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:param dist_along: The distance along this segment at the point of interest (point to be calculated)
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"""
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supported_segment_types = ["IFCCURVESEGMENT"]
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segment_type = segment.is_a().upper()
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if not segment_type in supported_segment_types:
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raise NotImplementedError(f"Expected entity type 'IFCCURVESEGMENT', got '{segment_type}")
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if dist_along > segment.SegmentLength:
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raise ValueError(f"Provided value {dist_along=} is beyond the end of the segment ({segment.SegmentLength}).")
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s = ifcopenshell.geom.settings()
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function_item = ifcopenshell_wrapper.map_shape(s, segment.wrapped_data)
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evaluator = ifcopenshell_wrapper.function_item_evaluator(s, function_item)
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trans_matrix = evaluator.evaluate(dist_along)
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return np.array(trans_matrix, dtype=np.float64).T
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def generate_vertices(rep_curve: entity_instance, distance_interval: float = 5.0) -> np.ndarray:
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"""
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Generate vertices along an alignment
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:param rep_curve: The alignment's representation curve to use to generate vertices.
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:param distance_interval: The distance between points along the alignment at which to generate the points
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"""
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if rep_curve is None:
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raise ValueError("Alignment representation not found.")
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supported_rep_types = ["IFCCOMPOSITECURVE", "IFCGRADIENTCURVE", "IFCSEGMENTEDREFERENCECURVE"]
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shape_rep_type = rep_curve.is_a().upper()
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if not shape_rep_type in supported_rep_types:
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raise NotImplementedError(
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f"Expected entity type to be one of {[_ for _ in supported_rep_types]}, got '{shape_rep_type}"
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)
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s = ifcopenshell.geom.settings()
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s.set("piecewise-step-type", 0) # 0 = step-size is maximum step size, 1 = step-size is mininimum number of steps
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s.set("piecewise-step-size", distance_interval)
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shape = ifcopenshell.geom.create_shape(s, rep_curve)
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vertices = shape.verts
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if len(vertices) == 0:
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msg = f"[ERROR] No vertices generated by ifcopenshell.geom.create_shape()."
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raise ValueError(msg)
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return np.array(vertices).reshape((-1, 3))
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def print_alignment(alignment, indent=0):
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"""
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Debugging function to print alignment decomposition
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"""
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print(" " * indent, alignment)
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for rel in alignment.IsNestedBy:
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for child in rel.RelatedObjects:
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print_alignment(child, indent + 2)
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for agg in alignment.IsDecomposedBy:
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for child in agg.RelatedObjects:
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print_alignment(child, indent + 2)
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def print_alignment_deep(alignment, indent=0):
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"""
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Debugging function to print alignment decomposition, including layout segments
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"""
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print(" " * indent, alignment)
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for rel in alignment.IsNestedBy:
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for child in rel.RelatedObjects:
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print_alignment_deep(child, indent + 2)
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if child.is_a("IfcAlignmentSegment"):
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print(" " * (indent + 4), child.DesignParameters)
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for agg in alignment.IsDecomposedBy:
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for child in agg.RelatedObjects:
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print_alignment_deep(child, indent + 2)
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def print_composite_curve(curve):
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"""
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Debugging function to print composite curve segments
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"""
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print(str(curve)[0:100])
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for segment in curve.Segments:
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print(" " * 2, segment)
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def print_composite_curve_deep(curve):
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"""
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Debugging function to print composite curve segments, including curve segment details
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"""
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print(str(curve)[0:100])
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for segment in curve.Segments:
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print(" " * 2, segment)
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print(" " * 4, segment.ParentCurve)
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print(" " * 4, segment.Placement)
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print(" " * 4, segment.Placement.Location)
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print(" " * 4, segment.Placement.RefDirection)
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def print_positioned_products(file: ifcopenshell.file):
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referents = file.by_type("IfcReferent")
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for referent in referents:
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print(referent)
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for rel in referent.Positions:
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for product in rel.RelatedProducts:
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print(" " * 2, product)
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