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It is a method to produce objects with irregularly formed surfaces
by using patterns from image files:
height_field{ ... } : this height field produces mountains
out of little triangles on a quadratic sector from <0,0,0> to <1,0,1>
(that means in the xz-plane) by using an image which color brightness
(colorindices by 256-colors-images) interpreted as the height of the angles of an triangle.
Where black(0) is interpreted as height 0 and
white(256) is interpreted as height 1. Other values of the brightness (or the colorindex)
accordingly between!
Basicly every image of the allowed fomats
(ending with: tga, gif, pot, png, pgm, ppm, jpg, tif, sys) is possible to use.
If you want to form a mountain with a soft shaped realistic landscape it is recommanded to
produce the used image with a graphic programm. This program need to have
the ability to work with true-color images and should have a simulated airbrush.
(e.g. "CorelPhotoPaint" -- The Windows programm "Paint" unfortuately is not good
for doing this) also useful is a function to soft the whole image and parts of the image.
A "height_field" int erprets grey values as height
between 0.00 = black = rgb<0,0,0>
and 1.00 = white = rgb<1,1,1>.
height_field{ tga "Mount1.tga" smooth
texture{Cork scale 0.02
pigment{quick_color Tan}
finish {ambient 0.10 diffuse 0.75 phong 0.1}}
translate<-0.5,-0.001,0> scale<100,15,100>} |
The image on the right side shows the
back and white image file
"Mount1.tga",
(scaled down somewhat and compressed by JPEG),
which is used in the sample below.
This simple back and white image produces, as a "height_field"
(multiple used and scaled different,
rotated and translated) a respectable
interesting mountainous landscape:
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