NAME¶

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

KEYWORDS¶

raster, export

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 (Fri, 16 May 2008) $ Full index © 2003-2011 GRASS Development Team