Holes in my textures with displacement !!!

[pclavett]

I am quite new to Terragen 2 and trying to make something with all the information available. And BTW, Thanks to all the information offered in this forum ! All very helpful. I have started to experiment with displacement in textures with Perlin 3D scalar. I started with a study of a fake_grass_tgd by I do not remember who, and I apologize to this person. Dissecting this texture made me understand somethings but I am blocked by things that occur on rendering, where holes appear with the sky shining through. When I render with atmosphere off, the holes are less painful but still present. The parameters of the PowerFractal seems to have an influence over the results with small values increasing the chances of having holes. Does anybody have an answer for this ? I do apologize if this is a stupid post or question !!!

[pclavett]

By playing around further with the powerfractal I can actually make the entire terrain disappear !!! Neat eh ! I do understand that this is not the ultimate goal of Terragen and know that there is something not right that I am doing...but I have no idea what it is !!! Hope one of you can show me the way ! Again apologies if this is a stupid post and hope you all have a Happy New Yeaar...which BTW is also my birthday ! Take Care !

[Volker Harun]

You define the scale of the perlin with a powerfractal. This is a very sensitive thingy ,-)
You need some very soft contrast on the powerfractal to avoid such distortions.
Inside that powerfractal ... first of all ... increase the smallest scale to some reasonable value. In the image you have a height difference of 500m and you use a tenth of a millimeter.
Second on the colour tab, go for a contrast of ~ 0.1 - while enabling the lowest colour.
Decrease the roughness, too ... 0.2 sounds good for me.
Than - last not least ... if you want to scale the perlin a nice way, change the colours to maybe:
highest colour: 20
lowest colour:15
Disable clamp for high and low colour.

By the way ... it is a known issue, that very small scales will destroy the reasonable output of the render.
Nonetheless ... it is always good to try and to ask :-)

Volker

[pclavett]

Thanks Volker for the suggestions. Will try them out and let you know how it turns out ! Appreciate your help !