Re: [Gnuplot-info] depthorder

[Thomas S. <t.s...@fz...>]

'set pm3d depthorder'
should according to the manual work in the same way as the
normal hidden3d algorithm.
but it obviously doesn't do this.
 

renzresearch wrote:
> 
> Thank you Thomas,
> 
> The sphere was just an example.  It is not what I want to
> draw.  The following script is closer to my real case, which
> draws a triangle and a quadrangle.  depthorder is used, but
> the quadrangle is always in the foreground and the triangle is
> always in the background.  Does the option depthorder mean the
> drawing order is sorted?
> 
> Zhong
> 
> 
> set terminal x11 0 size 1024,1024
> set view equal xyz
> unset surface
> unset contour
> set xlabel "x"
> set xrange [ 6.31720 : 43.9094 ] noreverse nowriteback
> set ylabel "y"
> set yrange [ 80.5847 : 118.177 ] noreverse nowriteback
> set zlabel "z"
> set zrange [ 13.7818 : 51.3741 ] noreverse nowriteback
> set pm3d implicit at s
> set pm3d depthorder
> set pm3d interpolate 1,1 flush begin ftriangles hidden3d 100
> corners2color mean
> set palette defined ( 0 0.8275 0.8275 0.8275, 0.1667 0.6275
> 0.1255 0.9412, 0.5 1 0.498 0.3137,\
>      0.8333 1 1 0, 1 0.5647 0.9333 0.5647 )
> splot '-' u 1:2:3:4
> 14.7151 89.5297 25.4546 0
> 
> 14.7151 89.5297 25.4546 0
> 14.807 87.5368 24.2974 0
> 16.5296 89.0361 24.1387 0
> 
> 
> 20.3047 93.7361 25.7469 0
> 22.1518 92.287 25.0393 0.0215407
> 
> 21.1107 92.4429 25.874 0.0188149
> 22.9446 91.0527 24.9673 0.0366333
> e
> 
> 
> ---- Original message ----
>>Date: Mon, 14 Dec 2009 08:50:07 -0800 (PST)
>>From: Thomas Sefzick <t.s...@fz...>  
>>Subject: Re: [Gnuplot-info] rotation center  
>>To: gnu...@li...
>>
>>
>>in addition you should set:
>>
>>set samp 25,10
>>set iso 10,20
>>set urange [-pi:pi]
>>set vrange [0:pi]
>>set pm3d at s ftriangles depthorder hidden3d 100
>>unset surf
>>
>>this makes the sphere look much better.
>>
>>
>>renzresearch wrote:
>>> 
>>> 
>>> 
>>> ---- Original message ----
>>>>Date: Sun, 13 Dec 2009 11:51:41 +0100
>>>>From: Hans-Bernhard Bröker <HBB...@t-...>  
>>>>Subject: Re: [Gnuplot-info] rotation center  
>>>>To: re...@uc...
>>>>Cc: gnu...@li...
>>>>
>>>>Zhong Ren wrote:
>>>>> Please consider the following script that draws a sphere.
>  Why
>>>>> the rotation center is not at the center of the sphere, when
>>>>> the graphics is spun by the mouse?
>>>>
>>>>Why should it be?  Did you really expect gnuplot to have a
>>> special rule 
>>>>like "whenever there is exactly one spherical surface among
>>> the plotted 
>>>>things, rotation will magically center around that"?
>>> 
>>> No, you didn't get my question.  Please consider my original
>>> case again:
>>> 
>>> Please consider the following script that draws a sphere.  Why
>>> the rotation center is not at the center of the sphere, when
>>> the graphics is spun by the mouse?  If I change to "set xrange
>>> [ 6 :  44]", the rotation center becomes the center of the
>>> sphere.  This makes the behavior of one of my large
>>> applications unpredictable.  Is there a way to specify the
>>> rotation center?  If not, how is the center selected by
> Gnuplot?
>>> 
>>> set terminal x11 0 size 1024,1024
>>> set parametric
>>> set view equal xyz
>>> set xlabel "x"
>>> set ylabel "y"
>>> set zlabel "z"
>>> set xrange [ 6 :  43]
>>> set yrange [80 : 118]
>>> set zrange [13 :  51]
>>> set pm3d implicit at s
>>> splot 10*cos(u)*cos(v)+25,10*cos(u)*sin(v)+99,10*sin(u)+33
>>> 
>>> The rotation center is indeed at the spherical center when
>>> xrange is [ 6 :  44], because (6+44)/2 = 25, which is exactly
>>> the spherical center.  When xrange is [ 6 :  43], the rotation
>>> center should be (6+43)/2 = 24.5, but it is not.  It is near
>>> x=33.  What makes Gnuplot to select the rotation center?
>>> 
>>>>
>>>>> If not, how is the center selected by Gnuplot?
>>>>
>>>>Mouse rotates the entire graph box, so, kind-of obviously,
> it is 
>>>>centered around the center of the graph box.  So if you want
>>> rotation to 
>>>>be around a particular point, make all three axis ranges
>>> symmetric 
>>>>around it:
>>>>
>>>>	set xrange [mid_x - size_x : mid_x + size_x]
>>>>	# likewise for y and z
>>>>
>>> 
>>> This is what I thought, but it is not working for me as the
>>> example I gave above.  Gnuplot seems to have a complex rule to
>>> select the rotation center.  I really prefer a user selected
>>> rotation center.
>>>
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>>
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