def compute_minimal_distance_between_cubes():
""" compute the minimal distance between 2 cubes
the line between the 2 points is rendered in cyan
"""
b1 = BRepPrimAPI_MakeBox(gp_Pnt(100, 0, 0), 10., 10., 10.).Shape()
b2 = BRepPrimAPI_MakeBox(gp_Pnt(45, 45, 45), 10., 10., 10.).Shape()
display.DisplayShape([b1, b2])
dss = BRepExtrema_DistShapeShape()
dss.LoadS1(b1)
dss.LoadS2(b2)
dss.Perform()
assert dss.IsDone()
edg = make_edge(dss.PointOnShape1(1), dss.PointOnShape2(1))
display.DisplayColoredShape([edg], color="CYAN")
def minimum_distance(shp1, shp2):
'''
compute minimum distance between 2 BREP's
@param shp1: any TopoDS_*
@param shp2: any TopoDS_*
@return: minimum distance,
minimum distance points on shp1
minimum distance points on shp2
'''
from OCCT.BRepExtrema import BRepExtrema_DistShapeShape
bdss = BRepExtrema_DistShapeShape(shp1, shp2)
bdss.Perform()
with assert_isdone(bdss, 'failed computing minimum distances'):
min_dist = bdss.Value()
min_dist_shp1, min_dist_shp2 = [], []
for i in range(1, bdss.NbSolution()+1):
min_dist_shp1.append(bdss.PointOnShape1(i))
min_dist_shp2.append(bdss.PointOnShape2(i))
return min_dist, min_dist_shp1, min_dist_shp2
def compute_minimal_distance_between_circles():
""" compute the minimal distance between 2 circles
here the minimal distance overlaps the intersection of the circles
the points are rendered to indicate the locations
"""
# required for precise rendering of the circles
display.Context.SetDeviationCoefficient(0.0001)
L = gp_Pnt(4, 10, 0)
M = gp_Pnt(10, 16, 0)
Laxis = gp_Ax2()
Maxis = gp_Ax2()
Laxis.SetLocation(L)
Maxis.SetLocation(M)
r1 = 12.0
r2 = 15.0
Lcircle = gp_Circ(Laxis, r1)
Mcircle = gp_Circ(Maxis, r2)
l_circle, m_circle = make_edge(Lcircle), make_edge(Mcircle)
display.DisplayShape([l_circle, m_circle])
# compute the minimal distance between 2 circles
# the minimal distance here matches the intersection of the circles
dss = BRepExtrema_DistShapeShape(l_circle, m_circle)
print("intersection parameters on l_circle:",
[dss.ParOnEdgeS1(i) for i in range(1, dss.NbSolution() + 1)])
print("intersection parameters on m_circle:",
[dss.ParOnEdgeS2(i) for i in range(1, dss.NbSolution() + 1)])
for i in range(1, dss.NbSolution() + 1):
pnt = dss.PointOnShape1(i)
display.DisplayShape(make_vertex(pnt))
def __init__(self, shape1, shape2, deflection=1.0e-7):
shape1 = Shape.to_shape(shape1)
shape2 = Shape.to_shape(shape2)
self._tool = BRepExtrema_DistShapeShape(shape1.object, shape2.object,
deflection,
Extrema_ExtFlag_MIN)