Alpine fractal shader v2

Started by AP, December 05, 2015, 10:57:27 pm

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AP

December 05, 2015, 10:57:27 pm Last Edit: December 06, 2015, 05:07:24 am by Chris
This may not be the appropriate time to inquire but i am curious if there are any plans to further update this shader?

However, interestingly enough, i think that i might have found an alternative solution to all of this. I will post some results soon.




AP

December 06, 2015, 06:52:05 am #1 Last Edit: December 06, 2015, 07:16:11 am by Chris
I used an Alpine fractal shader with reduced details for better looking erosion calculation. It seems to work quite well using the fractal patterns from that shader and enhancing it for a better sense of realism.

Dune

Sounds interesting. For distant alps I often (well, often... I rarely use it) raise the 10m minimum anyway to 100m or so, and add some fractal.

AP

December 07, 2015, 03:24:35 am #3 Last Edit: December 07, 2015, 03:29:18 am by Chris
It was working at first but i noticed what appears to be a limitation in the Alpine fractal, and that is true Hanging Valleys. The patterns are very good for such features but the valleys do not look higher then the lower larger scale valleys. Eroding is still a bit hard because not all of my smaller valleys are well defined. I will note that i am working on functions to imitate somewhat such mountain fractals with more defined hanging valley features so i can share that later to see if anyone has any better solutions to this.


Here are some examples...


AP

Here is another example in red is where the elevation is higher being the hanging valley then the main valley below in green and what i am after.

Dune

What comes to mind is using the erosion shader in 2 versions; a normal for the total inclusing hanging valleys, then a lower octave one to make the lower broad valley. I dont know if that would work...

AP

I did erode on top of erode but i did not try the lower octave idea. I'll have to see what happens with that.

AP

Tried it and the features of the Erosion fractal does not allow the gullie lengths to be long enough which is what i was using for the larger valleys. So it produced the wrong type of pattern. It would need the capability of having very long flow channels spreading out and breaking down even entirely flat terrains. In that instance long valleys can be made. Having a flatness feature would help also for the slopes like softer erosion as in plains. Even a way to have the erosion effect the terrain in a way to have rigid mountains to more soft eroded plain would be neat. Another thought is enhance Flow map B to go from a relatively straight river from the higher terrains then meandering along the more flattened terrain regions like having a built in adjustable soft warper.

Dune

Too bad. Not every theory works, I'm afraid. There's lots of things I conjure up in my head and try, but fail to work for mysterious reasons.

AP

December 08, 2015, 03:31:52 am #9 Last Edit: December 08, 2015, 04:43:13 am by Chris
No problem. There is still enough to experiment with for now. Certainly there will be nice new things to test in the near future within Terragen.

Oshyan

We're always working on new ideas, but so far we don't have a specific and overall beneficial update for the Alpine Fractal.

- Oshyan

AP

No doubt so it's all good. I'm not to concerned with the Alpine fractal. The more i explore, the more other alternatives present themselves. Not all of the time but more times then not.

AP

The lead-in octaves for the Alpine shader, how does one know how large the main features are and does it multiply the Feature scale itself for every octave added?

AP


Dune

Not me, sorry. Don't have a clue  :-[