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https://git.salome-platform.org/gitpub/modules/geom.git
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77 lines
2.4 KiB
Python
77 lines
2.4 KiB
Python
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# Creation of a PipeBiNormalAlongVector
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def MakeHelix(radius, height, rotation, direction):
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# - create a helix -
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radius = 1.0 * radius
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height = 1.0 * height
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rotation = 1.0 * rotation
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if direction > 0:
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direction = +1
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else:
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direction = -1
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pass
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from math import sqrt
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length_z = height
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length_xy = radius*rotation
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length = sqrt(length_z*length_z + length_xy*length_xy)
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import geompy
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nb_steps = 1
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epsilon = 1.0e-6
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while 1:
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z_step = height / nb_steps
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angle_step = rotation / nb_steps
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z = 0.0
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angle = 0.0
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helix_points = []
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for n in range(nb_steps+1):
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from math import cos, sin
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x = radius * cos(angle)
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y = radius * sin(angle)
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p = geompy.MakeVertex(x, y, z)
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helix_points.append( p )
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z += z_step
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angle += direction * angle_step
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pass
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helix = geompy.MakeInterpol(helix_points)
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length_test = geompy.BasicProperties(helix)[0]
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prec = abs(length-length_test)/length
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# print nb_steps, length_test, prec
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if prec < epsilon:
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break
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nb_steps *= 2
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pass
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return helix
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def MakeSpring(radius, height, rotation, direction, thread_radius, base_rotation=0.0):
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# - create a pipe -
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thread_radius = 1.0 * thread_radius
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# create a helix
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helix = MakeHelix(radius, height, rotation, direction)
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# base in the (Ox, Oz) plane
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import geompy
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p0 = geompy.MakeVertex(radius-3*thread_radius, 0.0, -thread_radius)
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p1 = geompy.MakeVertex(radius+3*thread_radius, 0.0, -thread_radius)
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p2 = geompy.MakeVertex(radius+3*thread_radius, 0.0, +thread_radius)
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p3 = geompy.MakeVertex(radius-3*thread_radius, 0.0, +thread_radius)
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e0 = geompy.MakeEdge(p0, p1)
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e1 = geompy.MakeEdge(p1, p2)
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e2 = geompy.MakeEdge(p2, p3)
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e3 = geompy.MakeEdge(p3, p0)
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w = geompy.MakeWire([e0, e1, e2, e3])
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# create a base face
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base = geompy.MakeFace(w, True)
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# create a binormal vector
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binormal = geompy.MakeVectorDXDYDZ(0.0, 0.0, 10.0)
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# create a pipe
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spring = geompy.MakePipeBiNormalAlongVector(base, helix, binormal)
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# Publish in the study
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geompy.addToStudy(base, "base")
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geompy.addToStudy(helix, "helix")
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geompy.addToStudy(binormal, "binormal")
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geompy.addToStudy(spring, "spring")
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return spring
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from math import pi
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spring = MakeSpring(50, 100, 2*pi, 1, 5, pi/2)
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