View source for Talk:Wrp File Format - 4WVR

note to self via vektorbosen

When trying to view the elevations I realized, that the elevations aren't short values as A-Lone-Wolfs doc implies. 
 
After watching some hex-values, I found some formulas, that should reflect the values right. 
 
w_e:  elevations as in 4WVR wrp file 
f_e:  elevations with floating point value  
 
When I create some elevations and want them to convert to Wrp-elevations I'm using the following formula: 
 
w_e = (short) ((f_e / 0.05) * 1.1111) 
 
Ok, when I want to convert them back  I am using something like this: 

f_e = floor( w_e / 22222.0f ) * 1000 + 
       floor( (w_e mod 22222.0f) / 2222.2f ) * 100 + 
      floor( (w_e mod 2222.2f) / 222.22f ) * 10 + a.s.o.
--[[User:Mikero|ook?]] 13:50, 13 July 2006 (CEST)


This value is an integral of the gridsize.

the gridsize is a fixed 50 metre CUBE. (This is applied equally to XY and Z)

GridDimension=  Elevation/50.0

Bis Floats are accurate to 4 decimal places

1.9999 eg

hence the actual value stored only needs the integer and those 4 digits 

GridDimension= (short)floor( (Elevation/50)*1000);


ie the 4 important digits are elevated to the integer position of a float. a floor is applied to get ONLY the integer component, and, finally, this is converted (stored) as a genuine short (signed) integer.

The max height or depth of an elevaton is +/- 1.6km