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Am 24.07.2017 um 00:22 schrieb Sven Littkowski:
> I think, it might be a good idea to attach the bump_map file. Just for
> size reasons, it is now a JPG, but you can put it back to a PNG file.
That was a good idea indeed.
> I also added the once keyword and the map_type. Still, no change.
>
> Will apply the other correctional changes as advised. but please see my
> bump_map file and check out. Thanks.
Your bump map is way oversized in terms of image dimensions. Or, more
precisely, in terms of image dimensions vs. dynamic range. As a
consequence you get color banding, which has the effect of
disintegrating the bumps into almost infinitesimally thin lines.
For a bump map, you want to make sure that the typical "slope" in your
image is /at least/ 1 "brightness step" per pixel.
There are several ways to improve your image in this respect:
(1) Significantly reduce the bump map's size in pixels.
(2) Re-create your bump map with more contrast, to make full use of the
bit depth provided by the image format.
(3) Re-create your bump map at a higher bit depth (e.g. 16 bits instead
of 8).
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From: Sven Littkowski
Subject: Re: QUESTION: Bump_Map not Effective?
Date: 24 Jul 2017 19:46:40
Message: <597686e0@news.povray.org>
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Here's the updated bump image. I reduced its size, made it 16bit, and
increased the contrast between dark and bright areas. Still - no
success. :-(
Another problem: The same thread exists inside the IMAGE section. I
posted there at first before making up my mind that it might be a
GENERAL topic. Now we have two identical threads. I think, we all should
just use THIS thread here, inside GENERAL.
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Attachments:
Download 'space - launcher - balloon - type 001 - moon runnings - balloon bumpmap.png' (314 KB)
Preview of image 'space - launcher - balloon - type 001 - moon runnings - balloon bumpmap.png'
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Am 25.07.2017 um 01:46 schrieb Sven Littkowski:
> Here's the updated bump image. I reduced its size, made it 16bit, and
> increased the contrast between dark and bright areas. Still - no
> success. :-(
>
> Another problem: The same thread exists inside the IMAGE section. I
> posted there at first before making up my mind that it might be a
> GENERAL topic. Now we have two identical threads. I think, we all should
> just use THIS thread here, inside GENERAL.
Since images will probably be sent back and forth,
`povray.binaries.image` is the more suitable location.
Posting attachments is generally discouraged, and actually impossible
from the web interface (http://news.povray.org), in all newsgroups
except those named `povray.binaries.*`.
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On 25.07.2017 01:15, clipka wrote:
> Am 25.07.2017 um 01:46 schrieb Sven Littkowski:
>> Here's the updated bump image. I reduced its size, made it 16bit, and
>> increased the contrast between dark and bright areas. Still - no
>> success. :-(
>>
>> Another problem: The same thread exists inside the IMAGE section. I
>> posted there at first before making up my mind that it might be a
>> GENERAL topic. Now we have two identical threads. I think, we all should
>> just use THIS thread here, inside GENERAL.
>
> Since images will probably be sent back and forth,
> `povray.binaries.image` is the more suitable location.
>
> Posting attachments is generally discouraged, and actually impossible
> from the web interface (http://news.povray.org), in all newsgroups
> except those named `povray.binaries.*`.
>
Agreed. Okay, everyone please check the IMAGES version of this thread
from now on. Thanks. :-)
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