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{alias:con}
h2. Name

*con* — Contour dataset using scalars

h2. Syntax
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*con i | v | s | n | ms | l* \[*noadj*] \[*sav*]

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h2. Description

Contor dataset with lines following the scalar values. 

h2. Arguments

h4. Main contouring arguments:

Note that the main contouring arguments are the same for other shell commands that contour in various ways.

*i* _incr_
{indent} _incr_ is the increment value.
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*v* _val1_ \[_val2_ _val3_ ...\]
{indent} Contour at specific values, _val1_, _val2_, ... 
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*s* _start increment stop_
{indent} *s* for step needs three numbers: _start_, _increment_ and _stop_ The first and last contour will be at _start_ and _stop_. 
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*n* _number_
{indent} Use _number_ contours (levels), equally distributed between the minimum and maximum value. 
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*ms* _start1 incr1 stop1 start2 incr2 stop2_
{indent} *ms* for multiple steps needs six following numbers. The first contour will be at _start1_, the last at _stop2_.
{indent}

*l*
{indent} Use levels from the last previous contouring operation. 
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*noadj*
{indent} The contours will, by default, be lifted up (or adjusted) a little bit for better visualization. This can be prevented with the *noadj* argument. Use this argument for contouring vertical surfaces like cross sections.
{indent}

*sav* \[*nodraw*]
{indent} Will save the contours in *active* and in *workspace* under the name *^con* which is not directly visible. If the *sav* argument is used in a command menu which restores the original active data, the user must make it _active_ by *mlo ^con*. The *nodraw* argument prevents the contours to be drawn on the screen.
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h2. Examples

h3. Ex.1: Contours following scalars
The above example produces this image. 

{noformat:|borderWidth=1|bgColor=#eeeeee}
        spe bgc whi    ;# specify background color to white
        vie def        ;# reset viewport
        ret 10         ;# return start window
        vie 4 1 1      ;# set up 4 viewports, select first
        mak ran 11     ;# make random points
        grp 70 70      ;# make grid and scalars
        ssc            ;# self scale
        mak p          ;# transform grid to polydata
        acm n 11       ;# map display
        con l          ;# contour using same levels
        mak sca        ;# be sure the scalars are there
        mhi grid1      ;# move grid to hi grid1
        vie 2 con      ;# select viewport 2and connect
        mak ran 11     ;# make new random points
        grp 70 70      ;# make new grid
        mak p          ;# transform grid to polydata
        acm l          ;# map display
        con l          ;# contour using same levels
        mak sca        ;# be sure the scalars are there
        mhi grid2      ;# move grid to hi grid2
        vie 3 con      ;# select viewport 3 and connect
        mlo grid1      ;# move grid1 to active
        mak rsc grid2  ;# replace scalars from grid2
        acm l          ;# map grid2 on top of grid1
        con l          ;# contour grid2 on top of grid1
        vie 4 con      ;# select viewport 4 and connect
        mlo grid2      ;# move grid2 to active
        mak rsc grid1  ;# replace scalars from grid1
        acm l          ;# map grid1 on top of grid2
        con l          ;# contour grid1 on top of grid2
        xwi sel        ;# force selected window in front
{noformat}

!att:_img_ref^scalars_on_surface.png|border=1!
_Displaying scalars from two grids on top of the other grid surface_

h2. See also

[acm - Color band mapping],  [cco - Color code legend], [cnn - Contour two sides], [map - Map display], [sma - Spline map]
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