[Interest] Fwd: Re: [Qt3d] Textures flickering

[Sean Harmer]

-------- Forwarded Message --------
Subject: 	Re: [Interest] [Qt3d] Textures flickering
Date: 	Sun, 29 Jul 2018 21:09:23 +0100
From: 	Sean Harmer <sean at theharmers.co.uk>
To: 	interest at qt-project.org



Hi Oleg,

* Change the near plane and far plane properties of the camera so you 
get greater depth precision by reducing the range covered

* Use a higher bit depth depth buffer via QSurfaceFormat

* Render your scene in multiple passes using different camera z-range 
for each part and clearing the depth buffer in between.

Cheers,

Sean


On 29/07/2018 21:04, Oleg Evseev wrote:
> Mike, thanks.
>
> Yes you are right. This is z-conflict.
> This model is rendered fine, without flickering in another project 
> with disabled fragment depth writes to depth buffer.
>
> How can I increase precision of z-buffer in qt 3d?
>
>
> 2018-07-29 21:28 GMT+03:00 Mike Krus <mike.krus at kdab.com 
> <mailto:mike.krus at kdab.com>>:
>
>     Hi
>
>     hard to say from the short video, but it looks like you may have z
>     fighting going on, two coinciding meshes and the lack on precision
>     causing this flickering…
>
>     Mike
>
>     > On 29 Jul 2018, at 14:58, Oleg Evseev <ev.mipt at gmail.com
>     <mailto:ev.mipt at gmail.com>> wrote:
>     >
>     > Hi all,
>     >
>     > When I load big models with help QSceneLoader in assimp-cpp test
>     example (or small models but move camera far away from object)
>     textures start flickering:
>     > https://youtu.be/5FUOWc412JE
>     >
>     > How to fix that?
>     > Thanks in advance for help.
>     >
>     > ---
>     > With regards, Oleg
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>     --
>     Mike Krus | mike.krus at kdab.com <mailto:mike.krus at kdab.com> |
>     Senior Software Engineer
>     KDAB (UK) Ltd., a KDAB Group company
>     Tel: UK Office +44 1625 809908   Mobile +44 7833 491941
>     KDAB - The Qt Experts, C++, OpenGL Experts
>
>
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