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I have a scene with
mesh2 {
...
pigment { Tufte rotate N*y }
...
}
but the pigment does not rotate. (Tufte is my own creation.)
Have I forgotten something?
--
*\\* Anton Sherwood *\\* www.bendwavy.org
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On 7-5-2015 10:34, Anton Sherwood wrote:
> I have a scene with
>
> mesh2 {
> ...
> pigment { Tufte rotate N*y }
> ...
> }
>
> but the pigment does not rotate. (Tufte is my own creation.)
> Have I forgotten something?
>
There is no reason why it should not, imo. We need a bit more info
though. First of all, is the mesh2 uv_mapped? From the basic
construction of your code I suppose not, but...
--
Thomas
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On 2015-5-07 01:34, Anton Sherwood wrote:
> pigment { Tufte rotate N*y }
D'oh! Tufte is made of "slope"s; one can understand that
rotating it might not work. I'll try this:
object {
...
rotate -N*y
pigment { Tufte }
rotate N*y
}
--
*\\* Anton Sherwood *\\* www.bendwavy.org
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On 2015-5-07 10:16, Anton Sherwood wrote:
> I'll try this:
>
> object {
> ...
> rotate -N*y
> pigment { Tufte }
> rotate N*y
> }
No luck.
--
*\\* Anton Sherwood *\\* www.bendwavy.org
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On 07/05/2015 19:04, Anton Sherwood wrote:
> On 2015-5-07 10:16, Anton Sherwood wrote:
>> I'll try this:
>>
>> object {
>> ...
>> rotate -N*y
>> pigment { Tufte }
>> rotate N*y
>> }
>
> No luck.
>
Try changing the direction vector
pigment {
slope {
< 0.500, 0.000, 0.500 > // <- Direction
}
color_map {
[0.000 rgbft <1.000,0.000,0.000,0.000,0.000>]
[0.534 rgbft <0.000,1.000,0.000,0.000,0.000>]
[1.000 rgbft <0.000,0.000,1.000,0.000,0.000>]
}
}
--
Regards
Stephen
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On 7-5-2015 20:04, Anton Sherwood wrote:
> On 2015-5-07 10:16, Anton Sherwood wrote:
>> I'll try this:
>>
>> object {
>> ...
>> rotate -N*y
>> pigment { Tufte }
>> rotate N*y
>> }
>
> No luck.
>
No surprise: You rotate /the object/ a certain value around the y-axis,
apply the pigment, rotate the object back the same value. You have not
rotated /the pigment/ itself.
However, if the pigment is a slope pattern (along y-axis I suppose) I do
not expect much to happen if you rotate it around the y-axis in any case.
--
Thomas
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On 2015-5-07 23:58, Thomas de Groot wrote:
> No surprise: You rotate /the object/ a certain value around the y-axis,
> apply the pigment, rotate the object back the same value. You have not
> rotated /the pigment/ itself.
Why not? Generally
object { ...
texture { foo }
translate ...
}
is not the same as
object { ...
translate ...
texture { foo }
}
> However, if the pigment is a slope pattern (along y-axis I suppose)
> I do not expect much to happen if you rotate it around the y-axis
> in any case.
Not even if it's built of slopes along, say, some other vector(s)?
--
*\\* Anton Sherwood *\\* www.bendwavy.org
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Attachments:
Download 'tufte.inc.txt' (1 KB)
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As there's only one object in the scene, I sidestepped the problem by
rotating the object *and* the camera while letting the pigment stay put.
--
*\\* Anton Sherwood *\\* www.bendwavy.org
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On 8-5-2015 9:17, Anton Sherwood wrote:
> On 2015-5-07 23:58, Thomas de Groot wrote:
>> No surprise: You rotate /the object/ a certain value around the y-axis,
>> apply the pigment, rotate the object back the same value. You have not
>> rotated /the pigment/ itself.
>
> Why not? Generally
>
> object { ...
> texture { foo }
> translate ...
> }
>
> is not the same as
>
> object { ...
> translate ...
> texture { foo }
> }
>
Hmm yes. I stand corrected for that one :-)
>> However, if the pigment is a slope pattern (along y-axis I suppose)
>> I do not expect much to happen if you rotate it around the y-axis
>> in any case.
>
> Not even if it's built of slopes along, say, some other vector(s)?
>
You are tickling the limits of my knowledge ;-) Slope is a difficult
pattern to use in my experience and I always need a lot of
experimentation to get it right.
I shall need to make a test scene to see what happens. Back soon.
--
Thomas
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On 8-5-2015 9:19, Anton Sherwood wrote:
> As there's only one object in the scene, I sidestepped the problem by
> rotating the object *and* the camera while letting the pigment stay put.
>
After testing, I can confirm that it is not possible to rotate a slope
pattern, in contrast to other patterns. Even more puzzling, I can
confirm that this is true too when applying the pigment and then
rotating the object: the pigment remains unchanged and does not rotate
with the object.
I do not know if this is a bug or is intentional. If the latest case,
the documentation does not mention it while at the same time indicating
the use of Pigment Modifiers in the example.
I believe we need the voice of an expert now.
--
Thomas
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