[Bf-cycles] realtime preview

[Mohamed Sakr]

Hi Nathan,

thanks a lot! :)
there are 2 things that I need to understand:
1- if I change the scene data "so the scene is always there" ,
cancel/restart the session performance penalty is ok? (I'm forced to
background = true)
2-
https://github.com/mcneel/RhinoCycles/blob/5a04498c14779533395bbb59b649e33dec4e0f0d/RenderEngines/ViewportRenderEngine.cs#L200-L202
I kinda don't understand how do we wait here? assuming you call everything
from a separate thread, the main thread will handle messages and the
separate thread will be locked in rendering?

cheers,
Mohamed Sakr

On Thu, Nov 12, 2015 at 2:31 PM, Nathan Letwory <nathan at mcneel.com> wrote:

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> And hi again,
>
> I wanted to illustrate what I'm doing with some links into the source
> of RhinoCycles. It might help see how it could be done. (And I'm
> assuming here I understood Cycles session management properly ;)
>
> Links interspersed in message below.
>
> On 12/11/2015 14:19, Nathan Letwory wrote:
> > Hi,
> >
> > On 12/11/2015 13:55, Mohamed Sakr wrote:
> >> Hi,
> >
> >> this crashes at some point, any ideas about the general logic
> >> here? note that I'm working with background = true
> >
> > With my work on RhinoCycles integration I have found that modifying
> > a running render session with background=true isn't very easy to
> > do. You'll have to first cancel the running session, push your
> > changes, then reset and restart.
>
> Not so long ago I was still using background-rendering in RhinoCycles.
> The update and render cycle look like this:
>
>
> https://github.com/mcneel/RhinoCycles/blob/5a04498c14779533395bbb59b649e33dec4e0f0d/RenderEngines/ViewportRenderEngine.cs#L150
>
> This worked together with a check for changes (and possible upload) here:
>
>
> https://github.com/mcneel/RhinoCycles/blob/5a04498c14779533395bbb59b649e33dec4e0f0d/RenderEngine.cs#L150
>
> - From CheckFlushQueue() you can see that I cancel the session before
> starting upload to Cycles.
>
> > If you render with background=false you can first pause the
> > session, then lock, update, reset and unpause.
>
> Simple start for the render session in RhinoCycles happens here:
>
>
>
>
> https://github.com/mcneel/RhinoCycles/blob/master/RenderEngines/ViewportRenderEngine.cs#L153
>
>
>
> Up until this basic session, scene and their parameters have been
> created and connected.
>
>
>
> CheckFlushQueue() checks if there are any changes in the changequeue,
> which at this point will be true. Synchronize() will pause the
> session, push the data, reset and unpause.
>
>
>
> Similarly, while the interactive render session is running I
> periodically check for new changes, which I do in the class governing
> that:
>
> https://github.com/mcneel/RhinoCycles/blob/master/Viewport/RenderedViewport.cs
> , more specifically in the UiUpdate() function here
>
> https://github.com/mcneel/RhinoCycles/blob/master/Viewport/RenderedViewport.cs#L125
>
>
> Hopefully this helped.
>
> /Nathan
>
>
> >
> >
> >> cheers, Mohamed Sakr
> >
> >
> >
>
> - --
> Nathan Letwory
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