POV-Ray : Newsgroups : povray.binaries.scene-files : @MichaelJF: sample of Rock texture from "Crossing Border" scene : Re: @MichaelJF: sample of Rock texture from "Crossing Border" scene Server Time: 19 May 2019 11:14:25 GMT
  Re: @MichaelJF: sample of Rock texture from "Crossing Border" scene  
From: MichaelJF
Date: 24 Feb 2019 18:57:20
Am 23.02.2019 um 08:56 schrieb Thomas de Groot:
> On 22-2-2019 19:52, MichaelJF wrote:
>> Am 29.01.2019 um 13:33 schrieb Thomas de Groot:
>>> Finally. I had to strongly clean up my code as successive additions, 
>>> changes, tweakings, had made it - at least working for the Crossing 
>>> Border scene - but not for any other one.
>>>
>>> Here is a test landscape scene, in addition to the bump_map I used 
>>> which may not be the best for the purpose. A better one should be 
>>> generated one day. I think about that. However, it works fine as-is.
>>>
>> Hi Thomas,
>> many, many thanks for your work. I was distracted a while from the 
>> POV-newsgroups by occupational issues unfortunatelly, but not inactive 
>> completelly. I soon found a spot in your scene suiting my needs to 
>> have a better scene to present my idea to model steam fog. Your 
>> texture is great seen at a certain distance, as my steam fog approach 
>> is, but at a close distance both approaches have their limits. May I 
>> ask you what kind of rock you tried to model specifically? A sort of 
>> sedimentary rock I would presume. But you are the geologist and can 
>> give hints to your model. As a statistician I can do guesswork only.
>>
> 
> Yes, the limitations of my rock approach derive almost entirely from the 
> use of a bump_map.A much better approach would be using an isosurface, 
> as the layered rocks are better modelled by functions. I think I have 
> done things like that in my long dormant (dead?) Geomorph macros, more 
> than ten years ago.

Hi Thomas,
interesting hint, I will search my archives. IIRC you have posted it to 
the scene-files ages ago.

> The rocks are supposed to be sedimentary deposits, very typical in 
> particular for the Jurassic and Cretaceous period of the Alpine regions. 
> When I was a student, we called them "pyjama formations", which tells my 
> age as I do not see any stripped pyjamas any more in modern stores, and 
> with the exception of quaint humoristic movies from a certain period...  
> :-)
> 

Very likely you are some years senior to me but I remember this kind of 
fashion as well.

Best regards
Michael


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