| NG Transparency Bug [message #73853] |
Tue, 30 November 2010 12:30 |
David Grier
Messages: 35
Registered: July 2010
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Dear Folks,
The following code appears to exercise a bug in IDL 8.0.1
(both Mac and Linux). It's supposed to draw a tilted
transparent disk on a set of 3D axes. In fact, the disk
completely blocks the occluded axis objects.
Interestingly, if you add other objects such as colored orbs
to the plot, they can be seen properly through the transparent
disk.
So, this seems to be a bug with how axes are rendered through
transparent objects.
Or am I missing something?
I would be very grateful for a workaround.
TTFN,
David
; ==== snip here for ====
; transparency bug demo
p = plot3d([-1,1],[-1,1],[-1,1], /nodata) ; create plot
(p.axes)[0].location = [0,0,0] ; center axes to demonstrate problem
(p.axes)[1].location = [0,0,0]
(p.axes)[2].location = [0,0,0]
theta = findgen(100)/99 * 2 * !pi ; add a tilted transparent green disk
beta = !pi/6.
x = cos(theta) * cos(beta)
y = sin(theta)
z = cos(theta) * sin(beta)
disk = polygon(x, y, z, target = p, $
/data, /fill_background, fill_color='lime_green', $
fill_transparency = 80)
; ... and voila! you can't see the axes through the transparent disk
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