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Welcome to Fractal Forums > Fractal Software > 3D Fractal Generation > Mandelbulb 3d > Geeky navel-gazing mandelbulb comparing
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Author Topic: Geeky navel-gazing mandelbulb comparing  (Read 3443 times)
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DarkBeam
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« Reply #15 on: November 19, 2011, 11:14:44 AM »
Jeremie I was speaking for my formulas and as Jesse said CosinePow8 is unchanged for a long time (the charm remains afro ) and the thread has been moved by a psychocinetic energy wink
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cKleinhuis
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« Reply #16 on: November 19, 2011, 03:52:44 PM »
hey people

2 things:

1st: i believe the perspective isnt exactly the one from daniel, it looks a bit rotated, i mean the viewpoint may be the same, but camera position certainly isnt ...
2nd: the different renderings come from:
        a. a general broken load/save functionality, this could be checked against that the user which created the image (bib) uses his own params to rerender the image after a new startup of the program
        b. different formula version

wink
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Jesse
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« Reply #17 on: November 19, 2011, 04:43:22 PM »
Quote from: KRAFTWERK on November 19, 2011, 09:10:58 AM
Very mysterious "answer" Jesse... wink

A mysterious answer to a mysterious topic... should fit  wink

Quote
What images do you need to solve this?

Just wanted to say that anybody with a system like yours should proof bib's parameters if they get the same result as you, but anyways, i would have still no clue what this strange thing could cause.  Some inaccuracies in specific calculations???
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KRAFTWERK
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« Reply #18 on: November 21, 2011, 09:57:13 AM »
Thank you for your concerns in this (rather interesting but geeky) problem of mine...
Christian: At the viewpoint of bibs render you clearly see the "wings" and my render of bibs params are from the exact same angle, even if there seems to be a slight difference in the FOV... hmmm, do you see this too bib & Jesse... My "camera" seems to have a wider FOV and "looking down" a bit more... was it your exact parameters bib?
Maybe if you save the parameters as a m3p file instead bib???

I will also make sure I use the latest formulas (I also thought that the Cosine bulb didn't change since the day the formula was found?)
But I have been slow on changing the ini dirs... I will try to do that this evening.

And OK Jesse I get what you were after. Well might be better not to fix this... I might never find the Wasp Troll again smiley
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bib
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« Reply #19 on: November 21, 2011, 10:03:25 AM »
Quote from: KRAFTWERK on November 21, 2011, 09:57:13 AM
... was it your exact parameters bib?


No. In fact I did not save the params for the 1st picture. Then you asked for the params so I tried to do approximately the same image, but obviously the PoV is not 100% matching.
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KRAFTWERK
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« Reply #20 on: November 21, 2011, 10:04:42 AM »
Quote from: bib on November 21, 2011, 10:03:25 AM
Quote from: KRAFTWERK on November 21, 2011, 09:57:13 AM
... was it your exact parameters bib?


No. In fact I did not save the params for the 1st picture. Then you asked for the params so I tried to do approximately the same image, but obviously the PoV is not 100% matching.

OK, then this is not an issue... I will try to refresh the ini dirs and see if that helps. Thank you bib!
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bib
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« Reply #21 on: November 21, 2011, 10:07:32 AM »
With the same params it's weird to notice the difference in quality and very slight difference in PoV
Your image:

Mine:

* wings.jpg (138.21 KB, 480x360 - viewed 160 times.)
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KRAFTWERK
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« Reply #22 on: November 21, 2011, 10:08:47 AM »
Still a slight miss-match...  afro
And my image is a bit more noisy... Strange...
« Last Edit: November 21, 2011, 10:52:24 AM by KRAFTWERK » Logged
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« Reply #23 on: November 21, 2011, 10:52:47 AM »
have you ever considered something similar to the "pentium bug"? maybe bib is running an amd system...  hrmm
 rolling on floor laughing
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KRAFTWERK
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« Reply #24 on: November 21, 2011, 11:03:24 AM »
Yes why not  afro... are you on AMD bib?
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bib
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« Reply #25 on: November 21, 2011, 11:48:40 AM »
Intel core i5 (my laptop)

Have not tried on my desktop (now on Ubuntu + Wine, Intel core i7)
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KRAFTWERK
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« Reply #26 on: November 21, 2011, 12:14:18 PM »
Quote from: bib on November 21, 2011, 11:48:40 AM
Intel core i5 (my laptop)

Have not tried on my desktop (now on Ubuntu + Wine, Intel core i7)

Same processor here!
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« Reply #27 on: November 21, 2011, 08:35:57 PM »
I get the same picture as bib... Win 7 64 bits + i5. Since that's 2 out of 3, Kraftwerk must be wrong, statistically speaking   cheesy A Beer Cup
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« Reply #28 on: November 21, 2011, 10:07:57 PM »
This looks like a problem with detecting when a ray intersects the surface to be rendered. If a feature is thinner than the sampling step it may be missed entirely. Where sampling starts is usually depends on the view point. Some rendering algs will bias their search near where neighboring pixel rays intersected the surface. This causes large features to appear and disappear based on small changes in the viewpoint.
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bib
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« Reply #29 on: November 21, 2011, 11:29:12 PM »
Quote from: fractower on November 21, 2011, 10:07:57 PM
This looks like a problem with detecting when a ray intersects the surface to be rendered. If a feature is thinner than the sampling step it may be missed entirely. Where sampling starts is usually depends on the view point. Some rendering algs will bias their search near where neighboring pixel rays intersected the surface. This causes large features to appear and disappear based on small changes in the viewpoint.

I agree in theory, but in practice, even by decreasing the calc precision to try to step over the wings, they remain. There must be something really weird happening on Kraftwerk's machine.


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S1.mx3CcN/UvNP6.QsLsUa3.ibhV..bTV1OK.sSq40.ly3CcN/UvNP6.MwLsUa3.ibhV.kqTV1OK.sSq
40.kz3CcN/UvNP6...EsUa3.eeWCNq0.IJ36wk8.wyLsUa3.................................
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* wings2.jpg (185.22 KB, 480x360 - viewed 134 times.)
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