## DESCRIPTION

Visualization program which loads the isosurfaces previously calculated using r3.mkdspf and displays them according to commands given at the prompt. r3.mkdspf creates a dspf file from the 3D raster and r3.showdspf uses this dspf file to draw isosurfaces and 3D raster map to draw planes and everything related (boxes, etc).

Upon initialization of the program, two graphics windows are opened, one for the color table and the other for data display. The display window initially contains a red bounding box. Command options are then printed to the terminal and user is prompted for drawing instructions:

    THE INTERACTIVE OPTIONS ARE:

    ?, (l #), L, (t #), (T # #), I, +, -
    (x #) (y #) (z #) r (X #) (Y #) (Z #)
    (B(x,y,z)#), (E(x,y,z)#), S, R, F, C, c, s, b, g, n, p[#], d, D, w, Q, h

     USAGE AND MEANING:

     ?         lists available thresholds
     l index# [index#...]  add threshold to display list
     L         draw current display list
     t index#  reset so only this threshold is displayed
     T index# index#   show thresholds between hi & lo
     I         toggle thresholds INSIDE hi/lo or OUTSIDE hi/lo
     +(+++)    display thresholds with consecutively increasing index#
     -(---)    display thresholds with consecutively decreasing index#

     x int#  absolute rotation around x-axis in degrees(int)
     y int#  absolute rotation around y-axis in degrees(int)
     z int#  absolute rotation around z-axis in degrees(int)
     r       rotate_model
     X int#  scale model in x
     Y int#  scale model in y
     Z int#  scale model in z

     B(x,y,z)int#  begin display along (x,y,z) axis at #
     E(x,y,z)int#  end display along (x,y,z)axis #
     S int#        specular highlight control
     R   resets display along axis to show all data
     F grid3name colortablename load new color file

     C   toggles the clear flag
     c   clears the display (no thresholds)
     s   swaps buffers
     b   toggles draw a box
     g   toggles grid
     n   toggles surface normal direction

     p   draw all walls
     p#  draw a wall: 1-top, 2-bottom, 3-east, 4-west, 5-north, 6-south

     d   draw (implement the option)
     D   draw a solid defined by T(isosurface + parts of walls)

     w   dump image to a file
     Q   QUIT
     h   help

     enter desired manipulations then press return
     >>

### Hints:

- To navigate around the data, use the r command, then place the mouse pointer in the graphics window and drag with the left mouse to rotate the bounding box. To zoom in and out, drag right or left with the middle mouse. When satisfied with the new viewing position, click with the right mouse.
- To quickly view a series of isosurfaces, enter a series of + or - characters, i.e. +++++++
- Scripts using above commands on separate lines may be directed to r3.showdspf as standard input. Use the # sign as the first character on a line to indicate a comment.

## EXAMPLE

After generating a "dspf" control file with r3.mkdspf start r3.showdspf. Display/add the layers using +.

List available thresholds with ?. Use l to select isosurfaces (available number can be adjusted with r3.mkdspf) and L to display:
`l 1 2 3 4 5
L`

To select and display a single threshold (here: 2), use:
`t 2`

To select and display a range of thresholds (here: 3-5), use:
`T 3 5
D`

To draw a box, enter
`p`
the p# to plot a selected wall (here top wall):
`p1`

Tp draw a cut-off box, define it's position
`Ex20`
`p`
Here Ex20 defines the x coordinate of the end of the box.

In general - p draws a side of a box, E, B, define where that box starts or ends, so to make a fence diagram, the user draws sides of a series of boxes which have their starting (or ending) side shifting by a given interval. (this way the user can draw even more complex fence diagrams which have perpendicular fences, by using Ey or By). It is sufficient to use only E or B depending whether fence are drawn by using the end side or front side of a box).

To draw a fence, a sequence like this would be needed
`Ex10
p5
Ex15
p5
Ex20
p5
Ex25
p5
` or the same would be
`Bx10
p6
Bx15
p6
Bx20
p6`

The p is needed for the fence diagram, solids and boxes.

## SEE ALSO

r3.mkdspf

## AUTHORS

Bill Brown, brown@gis.uiuc.edu

Last changed: $Date$