Geeky navel-gazing mandelbulb comparing

[DarkBeam]

Jeremie I was speaking for my formulas and as Jesse said CosinePow8 is unchanged for a long time (the charm remains ) and the thread has been moved by a psychocinetic energy

[cKleinhuis]

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

[Jesse]

Very mysterious "answer" Jesse...

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

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???

[KRAFTWERK]

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

[bib]

... 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.

[KRAFTWERK]

... 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!

[bib]

With the same params it's weird to notice the difference in quality and very slight difference in PoV
Your image:

Mine:

[KRAFTWERK]

Still a slight miss-match...  
And my image is a bit more noisy... Strange...

[taurus]

have you ever considered something similar to the "pentium bug"? maybe bib is running an amd system... 
 

[KRAFTWERK]

Yes why not  ... are you on AMD bib?

[bib]

Intel core i5 (my laptop)

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

[KRAFTWERK]

Intel core i5 (my laptop)

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

Same processor here!

[Madman]

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   

[fractower]

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.

[bib]

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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