r.out.povgrass - Online in the Cloud

PROGRAM:

NAME

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 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>
}

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