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Support => Terragen Support => Topic started by: gpstevens61 on May 17, 2009, 11:33:53 am

Title: Fractal terrain causing vertical jumps??
Post by: gpstevens61 on May 17, 2009, 11:33:53 am
I'm using the Fractal terrain to provide the general topology of the scene but it adds in areas where the surface jumps by 200-400m instantly, making it look like an artificial cliff.  I've got the following settings:  feature scale 1400, Lead-octaves 1, Smallest scale 10, Noise octaves 6, Displacement is applied with amplitude 2000, offset 0, roughness 1, there is no shader set for blending.  The other settings are Scale step 3, stretch factor 3, Late deposition 0.06125, Early deposition 0.25, Early deposition rate 2, Warp amount 0.25.

Any explanations, suggestions gratefully received.
Title: Re: Fractal terrain causing vertical jumps??
Post by: Mohawk20 on May 18, 2009, 04:50:03 pm
Just reading this quickly, I'd say it has something to do with the scale and displacement. For a hill like landscape with no cliffs, displacement amplitude should not be higher than the fractal scale.

If you play with those settings you might find a result you like.
Title: Re: Fractal terrain causing vertical jumps??
Post by: Oshyan on May 19, 2009, 02:43:03 am
It would also help to post a TGD and/or example image so we can really see what's going on.

- Oshyan
Title: Re: Fractal terrain causing vertical jumps??
Post by: cyphyr on May 19, 2009, 11:11:13 am
The only way I could see a simple fractal terrain doing this (NOT Alpine Fractal) is if, under the tweaks tab, you have some quite large nunmbers in the "Noise variation", "Boyancy from varaition" and "Clumping of varaition". A post of the tgd would help :)
richard
Title: Re: Fractal terrain causing vertical jumps??
Post by: Matt on May 19, 2009, 11:53:45 am
There is a bug in the Alpine Fractal which causes discontinuities like this sometimes. I haven't been able to fix it yet.

Matt
Title: Re: Fractal terrain causing vertical jumps??
Post by: gpstevens61 on May 19, 2009, 04:46:14 pm
Here is an example,  thanks

The settings are different but the effect is the same.  One thing I've discovered is that if I change the feature scale by a small amount (say 10) the "cliff" moves across the terrain.
Title: Re: Fractal terrain causing vertical jumps??
Post by: Oshyan on May 20, 2009, 01:24:28 am
This sounds like it may be an example of the bug Matt is referring to.

- Oshyan
Title: Re: Fractal terrain causing vertical jumps??
Post by: gpstevens61 on May 20, 2009, 08:06:34 am
That's OK, at least I won't spend any more hours tweaking random settings to try and get rid of it.

Thanks