Author Topic: Nebulae  (Read 12335 times)

Offline Stormlord

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Re: Nebulae
« Reply #225 on: April 15, 2018, 07:12:06 PM »
Thank you so much for sharing the TGC Dennis!
This helps me a lot and this simple clip was what I was asking for in my PM to you :-)

By the way... your Ideas and Images are brilliant and so beautiful!
RESPECT!!!

STORMLORD
« Last Edit: April 15, 2018, 07:21:42 PM by Stormlord »

Offline Denis Sirenko

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Re: Nebulae
« Reply #226 on: April 20, 2018, 12:38:15 PM »
On the contrary, your initial example clip setup has a smallest scale almost 5x the base scale.

Smallest scale - 76 meters, not 6000. Lead-in scale 26000. This means that the smallest scale is not 5x, but 340x smaller than the largest. But, as I said, it does not matter. You can get a small detail (for example, to turn a cloud into one point) if you get the desired fractal for a warper even having a minimum scale 5000.

The warping creates "holes" (in a terrain this would look bad) in this base form, while pushing them, creating build up along the edges of the wholes, creating that small scale debris details.

The reason for the appearance of such holes is not that we have too much difference in the scale of small and large parts. The fact is that you have too high and sharp peaks. This can happen on any scale. Try to adjust the fractal for the warper so that there are not too steep slopes for all octaves.

Here is a very simple example of varying repetition. You won't really see in it the render as the area we're looking at really has no really definition but what the cloud layer is forcing in due to extreme contrasts, but take a look at the last merge shaders preview.

There is clear repetition, but no shape is the same. Adding further warping, translation distances, can improve this method.

Edit: added some test renders with different seeds, and doing another at smaller scale, but will take longer.

I understand, thanks for *.tgd and examples. Honestly, I do not think I can use this method. I have a suspicion that in order to sufficiently pull the part, you need to add a large number of such transformations. Their number should exceed 10-15, and still, if there are enough small details of their duplication will be visible (although, perhaps, changing the shape of a new layer can fix this). All this, my computer just will not survive. While there are doubts in this method.

While I did this:





It's: (Сloud layer "A" + warping) - (Сloud layer "A")
It works fast enough. But this method is also not good in everything and it can be used only as an additional one.

Thank you so much for sharing the TGC Dennis!
This helps me a lot and this simple clip was what I was asking for in my PM to you :-)
By the way... your Ideas and Images are brilliant and so beautiful!
RESPECT!!!

Big thanks, Stormlord! This is a newer version of the file, it's better than the one you asked for because it has fewer vertical or horizontal structures. As I wrote to you in PM, I can not immediately know what I can sharing, and what not. There is a possibility that these nebulae will become an independent product that will cost some money. I posted this file, because I thought it was something I could share for free with everyone.
« Last Edit: April 20, 2018, 12:42:50 PM by Denis Sirenko »

Offline WASasquatch

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Re: Nebulae
« Reply #227 on: April 21, 2018, 12:16:13 AM »
The reason for the appearance of such holes is not that we have too much difference in the scale of small and large parts. The fact is that you have too high and sharp peaks. This can happen on any scale. Try to adjust the fractal for the warper so that there are not too steep slopes for all octaves.

As far as I can tell, octaves are directly related to your scales, predominately, you smallest scale. These peaks are not part of large scale PFs, the smallest scale directly relates to peaking.  For example if you check continue peaks, and amp up the maximum peak scale and displacement with a smallest scale of 0.025 and a maximum of 1 with a lead in of 1, you'll notice it will be full of ~+/-0.025 meter peaks.

As for repetition, I'm not sure what you hope to achieve? With expansion you have plainly visible repetition created by the source explosion, and the source explosion is never continual and only creates so much variance. The rest is independent formation of time through much slower forces, some even in different directions from cosmic sources rather than the radial source. And, again, with large scale fractalization, with low roughness, I'm not sure how the shapes could appear very similar after added warping.

Simeis remnant


Veil remnant


Even in the Crab Nebula there is only what looks to be 3-4 main reactions from the initial source. Example main reaction/phases: https://prnt.sc/j82f71

« Last Edit: April 21, 2018, 12:21:15 AM by WASasquatch »
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