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SURFACE (and SHADE_SURF) do not play nicely with !p.multi #1521

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jtappin opened this issue Feb 22, 2023 · 2 comments
Open

SURFACE (and SHADE_SURF) do not play nicely with !p.multi #1521

jtappin opened this issue Feb 22, 2023 · 2 comments
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@GillesDuvert
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3D Graphics (T3D) known to be buggy bug Something isn't working

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@jtappin
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jtappin commented Feb 22, 2023 •
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Sorry, yet another 3-D plotting problem.

h = hanning(32,32)
window,xs=800,ys=400
!p.multi=[0,2,1]
surface,h
surface,h
window,xs=800,ys=800
!p.multi=[0,2,2]
surface,h
surface,h
surface,h
surface,h

From this is is clear that the plotting code is dividing up the X-Y plane into 2 or 4 sub windows rather than dividing the plotting area.
The two plot case
2 plot case
The four plot case
4 plot case
The results with shade_surf are the same.
@jtappin
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jtappin commented Feb 23, 2023

I've done a little more digging around, and find that !p.region and !p.position behave in the same way as !p.multi for surface type plots.
Yet another awkwardness in relating IDL & PLPLOT coordinate systems (in the Fortran version of GRAFFER, I tend to find that breathing on code in that area is enough to break it)!

@GillesDuvert
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Actually IDL is more subtle (!) than that.

IDL> !P.MULTI=[0,2,2]
IDL>for i=0,3 do surface, hanning(32,32)

gives
image
but

IDL> surfr
IDL> for i=0,3 do surface, hanning(32,32),/t3

gives
image
which is what GDL does in all cases (because it uses only one transformation matrix in the modified drivers.)
Obviously this was too clever on my part. 😄

@GillesDuvert GillesDuvert self-assigned this Feb 28, 2023
@GillesDuvert GillesDuvert added bug Something isn't working 3D Graphics (T3D) known to be buggy labels Aug 11, 2023
@GillesDuvert GillesDuvert mentioned this issue Dec 22, 2023
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