NAME

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

KEYWORDS

raster, export, output

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

SOURCE CODE

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

Latest change: Tuesday Dec 17 20:17:20 2024 in commit: d962e90c026708a4815ea2b9f46c0e84c17de22d