r.out.pov.1grass man page

r.out.pov — Converts a raster map layer into a height-field file for POV-Ray.

Keywords

raster, export

Synopsis

r.out.pov
r.out.pov --help
r.out.pov input=name output=name  [hftype=integer]   [bias=float]   [scale=float]   [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

Flags

--overwrite

Allow output files to overwrite existing files

--help

Print usage summary

--verbose

Verbose module output

--quiet

Quiet module output

--ui

Force launching GUI dialog

Parameters

input=name [required]

Name of input raster map

output=name [required]

Name of output povray file (TGA height field file)

hftype=integer

Height-field type (0=actual heights 1=normalized)

bias=float

Elevation bias

scale=float

Vertical scaling factor

Description

r.out.pov converts a user-specified raster map layer (map==name) into a height-field file for POVray (tga==name). The hftype==value option (where value is either 0 or 1) specifies the height-field type. When the user enters 0 the output will be actual heights. If entered 1 the cell-values will be normalized. If hftype is 0 (actual heights) the bias==value can be used to add or subtract a value from heights. Use scale==value to scale your heights by value. The GRASS program r.out.pov can be used to create height- field files for Persistence of Vision (POV) raytracer. POV can use a height-field defined in Targa (.TGA) image file format where the RGB pixel values are 24 bits (3 bytes). A 16 bit unsigned integer height-field value is assigned as follows: RED = high byte, GREEN = low byte, BLUE = empty.

Example

An example Povray script file may look like this:

#include "shapes.inc"
#include "colors.inc"
#include "textures.inc"
#declare Scale = 7;
light_source { <40000, Scale*3000, 5000> color MainLight }
camera {
   location < 23000, Scale*2000, 0>
   angle  90
   look_at < 23000, Scale*1400, 5000>
}
height_field  {
   tga "dem.lr.tga"
   smooth
   water_level 0.11  // 726 / 6553.6 = 0.111
    texture {
      pigment {
          image_map { // image is always projected from -z, with front facing  +z, top to +Y
             ppm "map.lr.ppm"
             once
          }
          rotate x*90 // align map to height_field
      }
    }
   finish {
          ambient 0.2         // Very dark shadows
          diffuse 0.8         // Whiten the whites
          phong 0.2           // shiny
          phong_size 100.0    // with tight highlights
          specular 0.5
          roughness 0.05
   }
   scale < 14500, Scale*6553.6, 13000 >
   translate <18300, 0, 1100>
}

Author

Klaus D. Meyer, GEUM.tec GbR, eMail: GEUM.tec@geum.de

Last changed: $Date: 2016-07-01 00:17:58 +0200 (Fri, 01 Jul 2016) $

Source Code

Available at: r.out.pov source code (history)

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© 2003-2017 GRASS Development Team, GRASS GIS 7.2.1 Reference Manual

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