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Stephen <mca### [at] aol com> wrote:
> On 04/03/2018 14:51, Kenneth wrote:
> > BTW, re: the discussion there of 'bending the slopes of height_fields': It can
> > be done in an alternate way now, using POV-Ray's 'blend gamma' feature-- i.e.,
> > by purposely changing the gamma of the image that's used to make the HF
>
> I'll put the kettle on for a pot of tea. While I await clipka's reply. ;-)
>
I didn't mean to 'abuse the gamma', honest, cross my heart... but one thing led
to another, and uh... the Devil made me do it... :-P
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On 4-3-2018 15:51, Kenneth wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>
>>>>
>>>> It is a bit like your airbrush.
>>>>
>>>> --
>>>> Thomas
>>>
>>> I'd like to see.
>>>
>>
>>
http://news.povray.org/povray.binaries.images/thread/%3C48295282%40news.povray.org%3E/
>>
>
> I had forgotten that! :-O Thanks for the reminder.
:-)
>
> BTW, re: the discussion there of 'bending the slopes of height_fields': It can
> be done in an alternate way now, using POV-Ray's 'blend gamma' feature-- i.e.,
> by purposely changing the gamma of the image that's used to make the HF. That
> effectively changes the otherwise 'linear' slope of HF contours to more of a
> curve. For example, HF mountains made this way look more natural to my eye--
> like the mountain's slopes have naturally eroded. (There's also a HF difference
> between images SAVED at different gamma values, for the same reason-- 1.0 being
> a linear slope, 2.2 being more of a curve.)
>
Indeed. That is something I never really used purposefully but which you
do well to remind me of. Thanks!
I shall make a small test scene. A way for me to remember stuff.
--
Thomas
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On 4-3-2018 18:12, Norbert Kern wrote:
> #declare p_o_x = function {p_original (x,y,z).x}
> #declare p_o_y = function {p_original (x,y,z).y}
> #declare p_o_z = function {p_original (x,y,z).z}
>
I had thought to use:
#declare p_o_R = function {p_original (x,y,z).red}
#declare p_o_G = function {p_original (x,y,z).green}
#declare p_o_B = function {p_original (x,y,z).blue}
But that should yield the same thing I guess. I was going to code that...
--
Thomas
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On 04/03/2018 23:13, Kenneth wrote:
> Stephen <mca### [at] aolcom> wrote:
>> On 04/03/2018 14:51, Kenneth wrote:
>>> BTW, re: the discussion there of 'bending the slopes of height_fields': It can
>>> be done in an alternate way now, using POV-Ray's 'blend gamma' feature-- i.e.,
>>> by purposely changing the gamma of the image that's used to make the HF
>>
>> I'll put the kettle on for a pot of tea. While I await clipka's reply. ;-)
>>
>
> I didn't mean to 'abuse the gamma', honest, cross my heart... but one thing led
> to another, and uh... the Devil made me do it... :-P
>
>
>
Yes the devil finds work... ;-)
--
Regards
Stephen
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Just to show off. ;-)
--
Thomas
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Attachments:
Download 'and_pattern blend.png' (698 KB)
Preview of image 'and_pattern blend.png'
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On 5-3-2018 10:05, Thomas de Groot wrote:
> Just to show off. ;-)
>
again...
--
Thomas
Post a reply to this message
Attachments:
Download 'and_pattern blend_f2.png' (474 KB)
Preview of image 'and_pattern blend_f2.png'
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On 05/03/2018 09:11, Thomas de Groot wrote:
> On 5-3-2018 10:05, Thomas de Groot wrote:
>> Just to show off. ;-)
>>
>
> again...
>
>
I like this one. :-)
Has anyone tried to produce a solarisation effect?
--
Regards
Stephen
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On 3/2/2018 10:27 AM, And wrote:
> Use some codes to modify photos.
>
>
>
> #declare p_modify1 =
> pigment{
> pigment_pattern{p_original}
> pigment_map{
> #for(i,0,255)
> [i/255,
> bumps
> scale 1/input_wide_res
> scale 4.8
> rotate <0,0,20>
> color_map{
> [0.2+0.6*(1-pow(i/255,1/3)) rgbt<0,0,0,0.1>]
> [0.2+0.6*(1-pow(i/255,1/3)) rgbt<0,0,0,0.9>]
> }
> ]
> #end
> }
> }
>
>
>
>
I needed such a "half-tone" effect for something or other in the past. I
wish I could remember what.
Mike
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Thomas de Groot <tho### [at] degrootorg> wrote:
> Just to show off. ;-)
>
>
> --
> Thomas
This two are dazzling.
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On 5-3-2018 8:40, Thomas de Groot wrote:
> On 4-3-2018 15:51, Kenneth wrote:
>> Thomas de Groot <tho### [at] degrootorg> wrote:
>>
>>>>>
>>>>> It is a bit like your airbrush.
>>>>>
>>>>> --
>>>>> Thomas
>>>>
>>>> I'd like to see.
>>>>
>>>
>>>
http://news.povray.org/povray.binaries.images/thread/%3C48295282%40news.povray.org%3E/
>>>
>>>
>>
>
> :-)
>
>>
>> BTW, re: the discussion there of 'bending the slopes of
>> height_fields': It can
>> be done in an alternate way now, using POV-Ray's 'blend gamma'
>> feature-- i.e.,
>> by purposely changing the gamma of the image that's used to make the
>> HF. That
>> effectively changes the otherwise 'linear' slope of HF contours to
>> more of a
>> curve. For example, HF mountains made this way look more natural to my
>> eye--
>> like the mountain's slopes have naturally eroded. (There's also a HF
>> difference
>> between images SAVED at different gamma values, for the same reason--
>> 1.0 being
>> a linear slope, 2.2 being more of a curve.)
>>
>
> Indeed. That is something I never really used purposefully but which you
> do well to remind me of. Thanks!
>
> I shall make a small test scene. A way for me to remember stuff.
>
Like this. Left, image gamma is 1.0; right, image gamma is 2.2.
--
Thomas
Post a reply to this message
Attachments:
Download 'hf_test_image gamma.png' (132 KB)
Preview of image 'hf_test_image gamma.png'
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