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New get_shape_matrix utility.

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Dion Moult
2023-05-26 19:24:44 +10:00
parent 43bfd51ccb
commit 8bd77b3663
2 changed files with 25 additions and 14 deletions
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src/ifcopenshell-python/docs/ifcopenshell-python/geometry_processing.rst
+15 -8
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@@ -20,6 +20,7 @@ related information in ``shape.geometry``:
import ifcopenshell
import ifcopenshell.geom
import ifcopenshell.util.shape
ifc_file = ifcopenshell.open('model.ifc')
element = ifc_file.by_type('IfcWall')[0]
@@ -55,19 +56,25 @@ related information in ``shape.geometry``:
# Objects are never scaled, so the scale factor of the matrix is always 1.
matrix = shape.transformation.matrix.data
# Indices of vertices per triangle face e.g. [f1v1, f1v2, f1v3, f2v1, f2v2, f2v3, ...]
faces = shape.geometry.faces
# Indices of vertices per edge e.g. [e1v1, e1v2, e2v1, e2v2, ...]
edges = shape.geometry.edges
# For convenience, you might want the matrix as a nested numpy array, so you can do matrix math.
matrix = ifcopenshell.util.shape.get_shape_matrix(shape)
# X Y Z of vertices in flattened list e.g. [v1x, v1y, v1z, v2x, v2y, v2z, ...]
verts = shape.geometry.verts
# Indices of vertices per edge e.g. [e1v1, e1v2, e2v1, e2v2, ...]
edges = shape.geometry.edges
# Indices of vertices per triangle face e.g. [f1v1, f1v2, f1v3, f2v1, f2v2, f2v3, ...]
faces = shape.geometry.faces
# Since the lists are flattened, you may prefer to group them like so depending on your geometry kernel
grouped_verts = [[verts[i], verts[i + 1], verts[i + 2]] for i in range(0, len(verts), 3)]
grouped_edges = [[edges[i], edges[i + 1]] for i in range(0, len(edges), 2)]
grouped_faces = [[faces[i], faces[i + 1], faces[i + 2]] for i in range(0, len(faces), 3)]
# A nested numpy array e.g. [[v1x, v1y, v1z], [v2x, v2y, v2z], ...]
grouped_verts = ifcopenshell.util.shape.get_vertices(shape.geometry)
# A nested numpy array e.g. [[e1v1, e1v2], [e2v1, e2v2], ...]
grouped_edges = ifcopenshell.util.shape.get_edges(shape.geometry)
# A nested numpy array e.g. [[f1v1, f1v2, f1v3], [f2v1, f2v2, f2v3], ...]
grouped_faces = ifcopenshell.util.shape.get_faces(shape.geometry)
# A list of styles that are relevant to this shape
styles = shape.geometry.materials