Render take huge time !!

[DanyA48]

Hi !!

I have a big problème with my scene.
I'm modeling an house, so i allready done bedroom, living room and kitchen.

Now i'm trying to render differents views from cameras.
To tchek luminosity i hide all elements and try to render in 640x480 but after 10min Corona still calculate illumination ! I mean render screen stay black (except four-five white small points).

I allready done some renders before and i never get this probleme.

So there are my questions :
- if i hide all objets before render, corona calculates them even if they are hide ?
- how can I do to only calculate objects in my camera field ?

Regards !!

[romullus]

What do you mean by saying that you've hide all ellements? Maybe you've accidentally hide the lights and there's nothing to emit light in your scene?

[DanyA48]

Hi Romullus

I mean in layers panel i closed "eyes".
Necessary lights are not close (i use sun and  HDRI)

[sprayer]

Just check what current task in rendering dialog, to be check if it's rendering or making preparation for rendering. And check you ram usage, is it enough for your scene? And double check light =)

[DanyA48]

Just check what current task in rendering dialog, to be check if it's rendering or making preparation for rendering. And check you ram usage, is it enough for your scene? And double check light =)

"Current Task : Préparing geometry"
Préparing displacement + geometry take 20min.... to render a kitchen 1280*900. The task is still in progress... :-/

About light
I only have sun and HDRI. Nothinl else.

[sprayer]

Check this settings http://imagizer.imageshack.com/img922/8161/0AbCfn.jpg try to set higher or remove displacement material for test

[romullus]

Do you get warning about low RAM? It wouldn't hurt to attach screenshot of VFB with stats tab visible.

[maru]

What resolution are you rendering at?
It's probably displacement calculation being too detailed, and you may be running out of RAM.

More info: https://coronarenderer.freshdesk.com/support/solutions/articles/12000023310

[DanyA48]

Check this settings http://imagizer.imageshack.com/img922/8161/0AbCfn.jpg try to set higher or remove displacement material for test

Hi Spray. Thank you for your contribution.
I found the problem : I removed all displacement maps on basic wall texture.
And Screen Size was set on "1"

On my laptope (currently im working on my laptop waiting for my work station back) i have a warning message about RAM. But as i said in my post I allready done all previous render with these warning messages.

Anyway now, without Displacement map on the wall i can make render (8h for 1280*900...a kitchen viz ... I know it's creasy but usual with this laptop ah ah !! )

[DanyA48]

What resolution are you rendering at?
It's probably displacement calculation being too detailed, and you may be running out of RAM.

More info: https://coronarenderer.freshdesk.com/support/solutions/articles/12000023310

Thank you Maru. Appreciate !

That was the problem. My basic wall material had displacement map. Evenif i only rendered the kitchen, my house wall with displacement was calculated.
I removed displacement map on wall texture and now it's ok !

[DanyA48]

So depending computer it's better to incrase Bump parameter intead low "Screen Size" in Displacement setting ?

[maru]

So depending computer it's better to incrase Bump parameter intead low "Screen Size" in Displacement setting ?

It's best to use bump for small, fine details, and displacement for large features only.
Think of a brick wall:
Bump - cracks, scratches, surface structure
Displacement - brick pattern

[DanyA48]

So depending computer it's better to incrase Bump parameter intead low "Screen Size" in Displacement setting ?

It's best to use bump for small, fine details, and displacement for large features only.
Think of a brick wall:
Bump - cracks, scratches, surface structure
Displacement - brick pattern

Thank you !!
I got it !

[Njen]

And when using displacement, rarely do you ever need to go below a screen size of '1', as lower values are essentially creating edge lengths of tessellated geometry that are smaller than a pixel, which is mostly unnecessary.

[DanyA48]

And when using displacement, rarely do you ever need to go below a screen size of '1', as lower values are essentially creating edge lengths of tessellated geometry that are smaller than a pixel, which is mostly unnecessary.

Ok, thank you Njen !!