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from opencamlib import ocl, camvtk
"""
This scripts draws a picture which enumerates the vertices, edges, and faces
of an octree node, as used in the octree cutting simulation and
marching-cubes.
"""
def main():
print(ocl.version())
myscreen = camvtk.VTKScreen()
myscreen.camera.SetPosition(-8, -4, 25)
myscreen.camera.SetFocalPoint(0,0, 0)
arpos=-1.5
camvtk.drawArrows(myscreen,center=(arpos,arpos,arpos))
camvtk.drawOCLtext(myscreen)
octtext = camvtk.Text()
octtext.SetPos( (70, myscreen.height-600) )
myscreen.addActor( octtext)
octtext.SetText("Octree")
vertex = [ ocl.Point( 1, 1,-1), #// 0
ocl.Point(-1, 1,-1), #// 1
ocl.Point(-1,-1,-1), #// 2
ocl.Point( 1,-1,-1), #// 3
ocl.Point( 1, 1, 1), #// 4
ocl.Point(-1, 1, 1), #// 5
ocl.Point(-1,-1, 1), #// 6
ocl.Point( 1,-1, 1) #// 7
]
n=0
for v in vertex:
myscreen.addActor( camvtk.Sphere(center=(v.x,v.y,v.z), radius=0.1,color=camvtk.red))
v=v
t = camvtk.Text3D(color=camvtk.red, center=(v.x+0.1,v.y+0.1,v.z), text=str(n), scale=0.2, camera=myscreen.camera)
myscreen.addActor(t)
n=n+1
edgeTable = [ [0,1] ,
[1,2] ,
[2,3] ,
[3,0] ,
[4,5] ,
[5,6] ,
[6,7] ,
[7,4] ,
[0,4] ,
[1,5] ,
[2,6] ,
[3,7] ,
]
# draw the edges as tubes
ne = 0
for e in edgeTable:
ep1 = vertex[ e[0] ]
ep2 = vertex[ e[1] ]
tu = camvtk.Tube( p1=(ep1.x,ep1.y,ep1.z), p2=(ep2.x,ep2.y,ep2.z), radius=0.051, color=camvtk.green )
myscreen.addActor(tu)
mid = 0.5*(ep1 + ep2)
t = camvtk.Text3D(color=camvtk.green, center=(mid.x+0.1,mid.y+0.1,mid.z), text=str(ne), scale=0.2, camera=myscreen.camera)
myscreen.addActor(t)
ne=ne+1
# number the faces
face = [ [2,3,6,7] ,
[0,3,4,7] ,
[0,1,4,5] ,
[1,2,5,6] ,
[0,1,2,3] ,
[4,5,6,7] ,
]
nf=0
for f in face:
mid = ocl.Point()
for v in f:
mid = mid+vertex[v]
mid=0.25*mid
t = camvtk.Text3D(color=camvtk.blue, center=(mid.x,mid.y,mid.z), text=str(nf), scale=0.2, camera=myscreen.camera)
myscreen.addActor(t)
nf=nf+1
myscreen.render()
print("All done.")
myscreen.iren.Start()
if __name__ == "__main__":
main()
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