Hi Guys,
I've added the disabled depth write. I've been using VRML models that
are exported by VMD (http://www.ks.uiuc.edu/Research/vmd/). Here atoms
in molecules may show a transparent sphere to denote the van derWaals
fields. Without disabling the depth write, the overlapping transparent
spheres would show popping when a molecule is rotated due to swaps in
the depth sort. I know that strictly speaking the draw order may be
violated for overlapping transparent spheres, but this is less
disturbing than a popping depth cull on part of a transparent sphere. So
my suggestion would be to keep the depth draw disabled on transparent
objects. In the best case you do not see any difference since
transparent objects are already drawn back-to-front. In the worst case
a non-commutative blend operation is performed in the wrong order.
My 2 cents,
Gino
Robert Osfield wrote:
Thanks for the explanation, makes sense now. I've commented out this
line and have checked all the changes into svn/trunk. Cheers, Robert.
On Mon, Jun 8, 2009 at 10:31 AM, Johan
Nouvel<[email protected]> wrote:
Hello,
You're right Jan. I doesn't known why this code is here, but as I doesn't
want to change usual behaviour of the ReaderWriterVRML I have copied/pasted
this code from the readerWriterVRML itself. It is coherent with previous
behaviour.
For me, we could completely remove this code, in my part (line 452) and when
there is a material with transparency too (line 388).
Regards,
Johan.
Jan Ciger a écrit :
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Hi Robert,
Robert Osfield wrote:
HI Johan,
I'm just doing a review of your changes relative to svn/trunk and
concerned about the comment:
// GvdB: transparent objects do not write depth
...
Normally transparent objects do not disable depth write. Could you
please explain why you've done this as it would seem like something that is
very model specific not a general feature that you'd enable.
I think that these changes weren't made by him - I recall seeing this
when I was porting the plugin to new OpenVRML. I think it was added by
Gino van den Bergen (gino at dtecta.com) last time. I am not sure why he
did this change neither.
Regards,
Jan
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