On 16.11.19 08:37, Thomas de Groot wrote:

> Alternatively, you can use a patch: one single parsed square metre, 
> copied (rotated & translated) as often as necessary to cover a given 
> surface. Would be (slightly) faster but less memory heavy. Condition is 
> that the surface is not too bumpy however. Iirc, method introduced 20 
> years ago by Gilles Tran and Josh English.

Yes, I've heard about it... this would be convenient for flat lawns 
inside cities, but in more rugged terrain, I'll have to use fully parsed 
areas.

Meanwhile, I reduced the ambient value of the grass to 0.5 (original was 
1) and rendered a series with different grass density values:

Image #1: "Insect view" (5 cms above ground) at the southern edge of the 
patch, density 1 (25,000 grass blades per square metre)

Image #2: "Bird's view" (4 metres above ground) showing the entire 4 by 
3 metres patch, density 1

Image #3: same as #1, density 0.5 - still credible as temperate oceanic 
greenery (if I want to model some places in Cologne rather than 
POVghanistan)

Image #4: same as #2, density 0.5

Image #5: same as #1, density 0.1 - Vahur Krouverk's original density

Image #6: same as #2, density 0.1

Image #7: same as #1, density 0.01 - meagre semi-desert goat pasture! 
Welcome to Afghanistan!

Image #8: same as #2, density 0.01

Next step will be radiosity...

> 
>>
>> Of course, this is another attempt at POVghanistan... starting with 
>> public parks in cities on mostly flat terrain such als Herat or 
>> Mazar-e Sharif (less difficult to code than mountainous Kabul - and 
>> also more early "eye candy" for the interested public, such as the 
>> famous Timurid mosques), and, most important, for the time being, not 
>> placed onto an actual planetary sphere.
>>
> 
> Of course!

After 25 years of mostly day-dreaming about Khyberspace, I now feel 
ready to take on the enterprise to do it actually! Very possible that I 
now seriously look for CG/3D-enthusiastic Afghans on the Internet 
(probably younger than me) to join in the task of building Khyberspace - 
not necessarily with POV-Ray, and also not only pre-1978 Afghanistan, 
but also the futuristic "Afghatopia" mode!

See you in Khyberspace!

Yadgar

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