[Paraview] Strange opacity behavior

[Yi Chen]

Howdy,

I am using paraview 4.1.0 64bit on Ubuntu and when I play with the opacity
of overlaid objects I found the behavior is interesting.

Basically I would like to see the sphere through several overlaid planes
(along the normal direction of the planes) , as shown below. I first uses 4
planes.

[image: Inline image 1]

When the sphere has an opacity of 1.0, the effect looks correct, as shown
below

[image: Inline image 2]

But if I lower the sphere opacity for a tiny bit ( like opacity = 0.999 ),
the sphere is not visible at all, as shown below

[image: Inline image 3]

More strangely, when I use 3 planes instead of 4. The behavior looks
normal. I mean when I adjust the sphere opacity I can always see the sphere
unless the opacity is too low.

[image: Inline image 4]

Anyone has similar experience and happens to know why? Thanks!

Yi
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