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

[Utkarsh Ayachit]

I suppose some testing is in order. I'll plan to do some testing to
see how things are faring and report back.

Utkarsh

On Tue, Jul 12, 2016 at 5:24 PM, Scott, W Alan <wascott at sandia.gov> wrote:
> Don’t do AA if you have transparency on…  Otherwise, if you are local
> server, do so?
>
>
>
> From: Moreland, Kenneth
> Sent: Tuesday, July 12, 2016 3:10 PM
> To: David E DeMarle <dave.demarle at kitware.com>; Utkarsh Ayachit
> <utkarsh.ayachit at kitware.com>
> Cc: Scott, W Alan <wascott at sandia.gov>; paraview-developers at paraview.org
>
>
> Subject: RE: [Paraview-developers] [EXTERNAL] Re: Remind me - AA
>
>
>
> I would say proceed with caution. Using antialiasing only on client side
> used to be our solution, but it turns out antialiasing screws up other
> stuff, too, and we eventually threw up our hands and got rid of it. I
> definitely remember picking as an issue that cropped up. I think there were
> others, but I don’t remember them all. I think transparency (depth peeling)
> was one.
>
>
>
> -Ken
>
>
>
> From: David E DeMarle [mailto:dave.demarle at kitware.com]
> Sent: Tuesday, July 12, 2016 2:32 PM
> To: Utkarsh Ayachit <utkarsh.ayachit at kitware.com>
> Cc: Scott, W Alan <wascott at sandia.gov>; Moreland, Kenneth
> <kmorel at sandia.gov>; paraview-developers at paraview.org
> Subject: Re: [Paraview-developers] [EXTERNAL] Re: Remind me - AA
>
>
>
> 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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>
>