vsTASKER 7 User Manual
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Hillshading

 
Hill shading algorithm paint apply a brightness to each elevation plot according to general ambient light, sun position regarding the two opposite corners and the altitude above the terrain.
The formula compute the angle between the normal of the elevation area and the vector pointing to the sun. The smaller the angle, the brighter the plot.
Occultation is not taken into account. There is no shadow, even if the sun is set as low altitude.
 
 
Hillshading
1

Brightness

1. Brightness
Set the ambient light alpha of the sun.
 
2

Position

2. Position
Set the position of the sun from the top left corner of the terrain down to the bottom right corner.
 
3

Altitude

3. Altitude
Set the altitude of the sun from 100 m to 50,000 m