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r.out.pov.1grass

Langue: en

Version: 333145 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

NAME

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

KEYWORDS

raster

SYNOPSIS

r.out.pov
r.out.pov help
r.out.pov map=string tga=string [hftype=integer] [bias=float] [scale=float] [--verbose] [--quiet]

Parameters:

map=string

Name of an existing raster map
tga=string

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 substract 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: 2008-05-16 21:09:06 +0200 (ven, 16 mag 2008) $

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