Jörg "Yadgar" Bleimann wrote on 16/11/2019 19:38:
> 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
> 

I like the results. With an appropriate terrain the grass will looks 
very good.

Paolo

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