102 lines
2.9 KiB
Plaintext
102 lines
2.9 KiB
Plaintext
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.. _rotateln :
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 _place_holder;
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> **_ROTATELN_**
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>
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>> Rotates a point distribution (specified by ifirst,ilast,istride) about a
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line. The **copy** option allows the user to make a copy of the original
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points as well as the rotated points, while **nocopy** just keeps the rotated
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points themselves. The line of rotation defined by x1 through z2 needs to be
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defined such that the endpoints extend beyond the point distribution being
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rotated. theta (in degrees) is the angle of rotation whose positive direction
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is determined by the right-hand-rule, that is, if the thumb of your right hand
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points in the direction of the line (1 to 2), then your fingers will curl in
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the direction of rotation. xcen,ycen,zcen is the point where the line can be
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shifted to before rotation takes place.
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If the **copy **option is chosen, the new points will have only coordinate
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values (**xic, yic**, **zic**); no values will be set for any other mesh
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object attribute for these points.
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>>
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>> Note: _place_holder; The end points of the _place_holder; line
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segment must extend well beyond the point set being rotated.
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FORMAT: **rotateln** /ifirst,ilast,istride/ [**no**] **copy** /
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x1,y1,z1/x2,y2,z2/theta/xcen,ycen,zcen/
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 _place_holder; EXAMPLE:
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> * input.cylrot use rotateln and trans to move cylinder
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* create a cylinder centered around _place_holder; x=.5,z=.5, radius = .1
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* the cylinder is aligned parallel to the y-axis.
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* inside a box of width =2 , length=2 ,height=1
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* the regions are air for the cylinder - solid outside the cyl.
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* points are spread by surrounding the whole object with
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* a cylinder shell of points and then creating rays between
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* these points and the major axis of the cylinder. _place_holder; Points
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* are distributed along these rays inside the cylindrical region.
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* a background rectangular grid of points is spread outside the
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* cylinder.
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cmo/create/3dmesh
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surface/box1/reflect /box/-1.0,-1.0,0.0/ 1.0, 1.0, 1.0/
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surface/h1/intrface /cylinder/ 0.5, -1.,0.5/ 0.5, 1.0, 0.5/.1/
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region/H1/ le box1 and le h1 /
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region/Fill/ le box1 and gt h1 /
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mregion/Air/ le box1 and lt h1 /
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mregion/Solid/Fill
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createpts/xyz/11,11,1/-1.,-1.,1.1/1.0,1.0,1.1/,1,1,0/
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pset/rays/seq/1,0,0/
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regnpts/Fill/11/pset,get,rays/xyz/ 0.0,0.0,-0.1/1.0,1.0,-0.1/ &
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0.0,1.0,-0.1/0,0/
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* the rz command always distributes points with the z-axis as
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* the axis of symmetry
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* use the rotateln and trans commands to move the point
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* distribution after it is created.
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createpts/rtz/1,13,11/5.,0.,-1./5.,360.,1./0,1,1/0,0,0/
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pset/ray1/seq/0,0,0/
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rotateln/pset,get,ray1/nocopy/-100.,0.,0./100.,0.,0./-90./0.,0.,0./
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trans/pset,get,ray1/0.,0.,0./0.5,0.,0.5/
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regnpts/H1/3/pset,get,ray1/rtz/0.5,-1.1,0.5/0.5,1.1,0.5/0,0/
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filter/1,0,0/
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cmo/setatt//itp1/pset,get,rays/21
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cmo/setatt//itp1/pset,get,ray1/21
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setpts
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connect
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settets
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dump/gmv/gmv.cylrot/3dmesh
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finish
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>
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> [click here for image](../new_html/image/cylrot.gif)
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