[Paraview-developers] [EXTERNAL] Re: Remind me - AA

Tue Jul 12 16:32:00 EDT 2016

As long as it doesn't affect selection, sounds pretty snazzy.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Tue, Jul 12, 2016 at 4:27 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> While the technical arguments are indeed sound, we tend to get asked
> about this quite periodically. What do folks think about using AA by
> default for builtin or client-side render and not when compositing?
> This way, 2D charts, for example, will always have AA turned on --
> just a nice little perk.
>
> Utkarsh
>
> On Tue, Jul 5, 2016 at 10:08 PM, Scott, W Alan <wascott at sandia.gov> wrote:
> > OK, much better pushback.  I would say AA (either the hack mentioned
> below
> > or real) probably isn’t worth a non-trivial software change at this
> point.
> > We should keep it on the table for future work.
> >
> >
> >
> > Alan
> >
> >
> >
> > From: Moreland, Kenneth
> > Sent: Friday, July 01, 2016 7:58 PM
> >
> >
> > To: Scott, W Alan <wascott at sandia.gov>; David E DeMarle
> > <dave.demarle at kitware.com>
> > Cc: paraview-developers at paraview.org
> > Subject: Re: [Paraview-developers] [EXTERNAL] Re: Remind me - AA
> >
> >
> >
> > OK, let me rephrase my pushback. There are several technical hurtles to
> > implement this feature. We know how to achive this effect, but it
> requires a
> > non-trivial change to the rendering system that will take significant
> > development cycles, add complexity to the rendering system, and
> potentially
> > destabilize several features relying on the rendering. Plus, this is all
> > happening in the middle of a push for other (more important) rendering
> > features (OpenGL2, OpenSWR, Ospray, IndeX).
> >
> >
> >
> > We turned off antialiasing in ParaView years ago because it caused way
> more
> > problems than it was worth. The question is, do you really think it is
> > important enough now to have a software push for it?
> >
> >
> >
> > -Ken
> >
> >
> >
> > From: Walter Scott <wascott at sandia.gov>
> > Date: Friday, July 1, 2016 at 12:12 PM
> > To: Kenneth Moreland <kmorel at sandia.gov>, David E DeMarle
> > <dave.demarle at kitware.com>
> > Cc: "paraview-developers at paraview.org" <paraview-developers at paraview.org
> >
> > Subject: RE: [Paraview-developers] [EXTERNAL] Re: Remind me - AA
> >
> >
> >
> > Makes sense.  But…
> >
> >
> >
> > 1)      Make it 2X – i.e., 4 times the pixels, if the user asks for
> better
> > images when lines are visible.  Default off.  You want better images, it
> > will be slower (when lines are visible).
> >
> > 2)      We do it (when rendering off screen) all the time when making
> movies
> > for the power wall.  I don’t see this as an issue…
> >
> > 3)      Have the line widths automatically written 2X requested width.
> > Thus, when it shrinks by 2, you get normal, poor man’s AA lines.
> >
> >
> >
> > Alan
> >
> >
> >
> > From: Moreland, Kenneth
> > Sent: Friday, July 01, 2016 9:20 AM
> > To: Scott, W Alan <wascott at sandia.gov>; David E DeMarle
> > <dave.demarle at kitware.com>
> > Cc: paraview-developers at paraview.org
> > Subject: Re: [Paraview-developers] [EXTERNAL] Re: Remind me - AA
> >
> >
> >
> > Reason 1: Increasing the resolution 2X increases the compositing
> overhead by
> > up to 4. Increasing the resolution 4X increases the compositing time by
> up
> > to 16. It can be a noticeable difference when rendering interactively.
> >
> >
> >
> > Reason 2: There can be technical difficulties in rendering images that
> > large. You are likely to have a rendering context of the original
> > resolution. To render such large images with images/movies, it renders
> image
> > tiles and stitches them together. This adds further overhead and
> > complication in rendering.
> >
> >
> >
> > Reason 3: Line width is measured in pixels. Changing the resolution of
> the
> > image in this way will change the perceived line width.
> >
> >
> >
> > -Ken
> >
> >
> >
> > From: Paraview-developers <paraview-developers-bounces at paraview.org> on
> > behalf of Walter Scott <wascott at sandia.gov>
> > Date: Thursday, June 30, 2016 at 7:48 PM
> > To: David E DeMarle <dave.demarle at kitware.com>
> > Cc: "paraview-developers at paraview.org" <paraview-developers at paraview.org
> >
> > Subject: Re: [Paraview-developers] [EXTERNAL] Re: Remind me - AA
> >
> >
> >
> > OK, why can’t we do that?  Have a mode that internally runs 2X or 4X
> > resolution, does the compositing, and then shrinks back to what the user
> > wants?  Only turn it on when 3d lines are in the image?
> >
> >
> >
> >
> >
> >
> >
> > From: David E DeMarle [mailto:dave.demarle at kitware.com]
> > Sent: Thursday, June 30, 2016 7:46 PM
> > To: Scott, W Alan <wascott at sandia.gov>
> > Cc: paraview-developers at paraview.org
> > Subject: [EXTERNAL] Re: [Paraview-developers] Remind me - AA
> >
> >
> >
> >
> > Antialiasing confuses depth compositing.
> >
> > Better to save out images/movies at 4x resolution and resample outside of
> > paraview.
> >
> >
> > On Thursday, June 30, 2016, Scott, W Alan <wascott at sandia.gov> wrote:
> >
> > Why can’t we turn anti alias lines on?  I am doing a feature edges, and
> it
> > looks horrible.
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Alan
> >
> >
> >
> > --------------------------------------------------------
> >
> > W. Alan Scott
> >
> > ParaView Support Manager
> >
> >
> >
> > SAIC
> >
> > Sandia National Laboratories, MS 0822
> >
> > Org 9326 - Building 880 A1-K
> >
> > (505) 284-0932   FAX (505) 284-5619
> >
> > ---------------------------------------------------------
> >
> >
> >
> >
> >
> > --
> > David E DeMarle
> > Kitware, Inc.
> > R&D Engineer
> > 21 Corporate Drive
> > Clifton Park, NY 12065-8662
> > Phone: 518-881-4909
> >
> >
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