POV-Ray : Newsgroups : povray.general : QUESTION: Bump_Map not Effective? Server Time: 22 Oct 2017 21:02:35 GMT
  QUESTION: Bump_Map not Effective? (Message 11 to 14 of 14)  
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From: clipka
Subject: Re: QUESTION: Bump_Map not Effective?
Date: 24 Jul 2017 16:53:50
Message: <5976261e$1@news.povray.org>
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 23:46:40
Message: <597686e0@news.povray.org>
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'
space - launcher - balloon - type 001 - moon runnings - balloon bumpmap.png


 

From: clipka
Subject: Re: QUESTION: Bump_Map not Effective?
Date: 25 Jul 2017 05:15:34
Message: <5976d3f6$1@news.povray.org>
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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From: Sven Littkowski
Subject: Re: QUESTION: Bump_Map not Effective?
Date: 25 Jul 2017 05:56:24
Message: <5976dd88$1@news.povray.org>
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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