Op 12/10/2023 om 00:40 schreef Samuel B.:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 08/10/2023 om 22:36 schreef Samuel B.:
>>> [...] It's a general lack of smoothness [...]
>>>
>> I wonder if you do no interpret here the granite normals from the used
>> (complex) rock texture...? See below.
> 
> Yeah, it's quite possible. Also, other differences in shading, colors and aa
> could have something to do with my perception of things.
> 
...which still does not preclude your initial comment obviously. It is 
something I have not been consciously aware of enough.

As a side track to the subject, I am playing also with height field maps 
generated by GeoControl (*.tga). It also provides normal maps (the 
well-known bluish maps) and greyscale maps, both as *.bpm. I want to 
explore if I can usefully add the normal maps to my height fields. It 
looks like it does.

>> [ex cathedra]
>> My playing with the warp {turbulence ...} had the interesting effect of
>> nicely simulating what is known as 'loading' in sedimentology:
>> alternating layers of unconsolidated, water-saturated, sediments
>> (sand/clay), for example in tidal basins with a high sediment input.
>> Differential compaction of those sediments may generate 'loading'
>> deformation of the coarser sediments into the finer ones. Earthquakes
>> can generate those same features by 'liquefying' soft sediments.
>> [/ex cathedra]
> 
> It's very fascinating. I'm sure the layers could tell you a lot about the makeup
> and history of the surrounding landscape... And I bet one could find heavier
> minerals at the bottoms of various basins, given enough disturbance of the
> sediments during and after deposition. Gold, if present, will of course settle
> toward the bottoms of things, but other stuff is sure to settle in as well. Many
> precious & semi-precious gems (ruby, garnet, etc.) are denser than other
> minerals. In fact, there's a local creek where small red garnets can be found
> alongside gold, provided the panning step isn't done too aggressively.
> 
Indeed. However, it all depends on the availability (far of or nearby) 
of source rocks containing or having contained such minerals, as the 
concentrations of gold or heavy minerals (placers!) are the results of 
erosion and then winnowing by streams and other such processes. Even the 
wind can play that role in desert environments. So yes, knowing 
something about the local geology can be very useful.

>>> Btw, 'CamZoom' doesn't seem to do anything. Changing the camera's angle to this
>>> makes it work: CamAng/CamZoom
>>>
>> I know. CamZoom is just there in case it is needed. It is in fact a
>> relict from another scene I didn't bother to ditch. :-)
>>
>> [>] Just for completeness sake, I checked; it originally came from the
>> original iso2pov scene codes by Jaime. I do not remember having checked
>> its correct working...
> 
> Its funny how various bits of code tend to collect and deposit themselves in our
> scenes over time :D
> 
There it is! Erosion and sedimentation in action! :-)

-- 
Thomas

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