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Support extruded vector curves and tilts

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This commit is contained in:
Dion Moult
2019-11-06 17:37:51 +11:00
parent fae405bfe0
commit 0d7d843fc9
1 changed files with 41 additions and 4 deletions
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src/ifcblenderexport/io_export_ifc/export_ifc.py
+41 -4
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@@ -3,7 +3,7 @@ import csv
import json
import time
from pathlib import Path
from mathutils import Vector
from mathutils import Vector, Matrix
from . import ifcopenshell
class ArrayModifier:
@@ -1264,6 +1264,24 @@ class IfcExporter():
representation['subcontext'], 'Curve',
self.ifc_edges)
# https://medium.com/@behreajj/scripting-curves-in-blender-with-python-c487097efd13
# https://blender.stackexchange.com/questions/30597/python-up-vector-math-for-curve
def bezier_tangent(self, pt0=Vector(), pt1=Vector(), pt2=Vector(), pt3=Vector(), step=0.5):
# Return early if step is out of bounds [0, 1].
if step <= 0.0:
return pt1 - pt0
if step >= 1.0:
return pt3 - pt2
# Find coefficients.
u = 1.0 - step
ut6 = u * step * 6.0
tsq3 = step * step * 3.0
usq3 = u * u * 3.0
# Find tangent and return.
return (pt1 - pt0) * usq3 + (pt2 - pt1) * ut6 + (pt3 - pt2) * tsq3
def create_curve_representation(self, representation):
# TODO: support unclosed surfaces
swept_area = self.file.createIfcArbitraryClosedProfileDef('AREA', None,
@@ -1272,10 +1290,29 @@ class IfcExporter():
for spline in representation['raw'].splines:
direction = spline.bezier_points[1].co - spline.bezier_points[0].co
unit_direction = direction.normalized()
# This can be used in the future when dealing with non vector curves
#curr_point = spline.bezier_points[0]
#next_point = spline.bezier_points[1]
#j_percent = 0
#direction = self.bezier_tangent(
# pt0=curr_point.co,
# pt1=curr_point.handle_right,
# pt2=next_point.handle_left,
# pt3=next_point.co,
# step=j_percent)
tilt_matrix = Matrix.Rotation(-spline.bezier_points[0].tilt, 4, 'Z')
print(spline.bezier_points[0].tilt)
print(tilt_matrix)
x_axis = unit_direction.to_track_quat('-Y', 'Z') @ Vector((1, 0, 0)) @ tilt_matrix
print((tilt_matrix @ Vector((1, 0, 0))))
print(x_axis)
position = self.create_ifc_axis_2_placement_3d(
spline.bezier_points[0].co, unit_direction, x_axis)
swept_area_solids.append(self.file.createIfcExtrudedAreaSolid(
swept_area, self.origin,
self.file.createIfcDirection(
(unit_direction.x, unit_direction.y, unit_direction.z)),
swept_area, position,
self.file.createIfcDirection((0., 0., 1.)),
direction.length))
# TODO: support other types of swept areas
#swept_area_solid = self.file.createIfcFixedReferenceSweptAreaSolid(