bad quality rendering

[Anonymous]

Hi.

I have a problem with the rendering in one computer a use. De quality of the images is not very good. They always have this white points all over it. I already changed all the rendering configuration trying to fix it, but nothing worked. Can someone give some tips about it?

Here is a imagem rendered in high quality:

Ps: sorry about my english, i'm brazilian.

[Anonymous]

hello 

i have the same issue in the last versions of Revit when i hit the high quality so usually i render in the medium quality and i make the size bigger so i can get a net image you can check my rendered images on my website www.alyrashid.com 

[ennujozlagam]

@Anonymous hello, Please also consider graphics card model (video card) when you do a rendering in Revit, high end graphics card model has a better result. Thanks

[JJWGallagher]

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@ennujozlagam wrote:

@Anonymous hello, Please also consider graphics card model (video card) when you do a rendering in Revit, high end graphics card model has a better result. Thanks

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@ennujozlagam That isn't true at all... Revit uses the CPU for rendering. Even if it did use the GPU it wouldn't affect the image output of a render, just the time it takes to render. 

This is a horrible reply and you should really be careful about what you post on here to people who aren't technically able to understand. Especially as an 'Autodesk Expert Elite', people depend on you for accurate and knowledgeable answers. This post has neither. 

[ToanDN]

@Anonymous

Can you try to render a Region instead of View see if anything changes?

[Anonymous]

Yes, unfortunately the same thing happens when rendering region. Nothing changes.

[Viveka_CD]

Hi @Anonymous

Welcome to the Autodesk community! 

Can you send us a screenshot of your render settings, the materials used and mention the version of Revit you are using? 

Please see HERE for best practices - rendering in Revit.

Looking forward to your reply update.

Regards,

[Viveka_CD]

Hi @Anonymous

The website link you provided does not work. Can you please update it? 

Regards,

[Anonymous]

hey @Viveka_CD 

the website is www.alyrashid.com

[Viveka_CD]

Hi @Anonymous

I just wanted to follow up here, any progress on this issue?

Please see HERE for a similar discussion on rendering tips.

Send us a screenshot of your render settings, the materials used and mention the version of Revit you are using? 

looking forward to your reply update.
Please mark any posts that help with "Accept as Solution" and thanks!

[Viveka_CD]

Hi @Anonymous

I just wanted to follow up here, any progress on this issue?

Please mark any posts that help with "Accept as Solution" and thanks!

[Anonymous]

Hi! I'm sorry for not aswering before.

The problem remains. Here are some screenshots of the render configurations. This happens with other projects too. I guess is something with the computer.

[marsmjl]

I have same problem on my render, it is good if you use medium or lower quality render but not higher. It is so annoying. I try to see if I can render in 2017 instead of 2018 Revit, I found revit is not back compatible! OMG! 

[ToanDN]

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@marsmjl wrote:

I have same problem on my render, it is good if you use medium or lower quality render but not higher. It is so annoying. I try to see if I can render in 2017 instead of 2018 Revit, I found revit is not back compatible! OMG! 

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What is the output resolution?  Did you let the High Quality render finish the rendering process?  And you just now OMG about Revit being not backward compatible like it is a earth shattering news?  It never is.

[dgorsman · Accepted solution]

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@marsmjl wrote:

I have same problem on my render, it is good if you use medium or lower quality render but not higher. It is so annoying. I try to see if I can render in 2017 instead of 2018 Revit, I found revit is not back compatible! OMG! 

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Noise/grainy images typically indicate the render process wasn't given enough time.  Each pass gradually refines the final image, reducing the noise.  When going for high quality, have a look for custom settings which give you control over how many passes.  You'll want those to run for at *least* 20 passes if not more.  When this is done on a desktop typical render times are in the hours, possibly needing overnight or over a weekend.

[Anonymous]

Hi, dgorsman. You were right. I copied the high quality configuration to custom and ran the rendering for about 28 passes (Revit default were 20) and the noise desapeared. But I still think it is conected with my computer configurations. Because when I used another PC I needed less passes and less time to get a clean image in high quality.

I would like to know what can I change in the PC or what should I change in the configuration, since medium quality doesn't get noisy. I would like to render somewhere between the two configurations, with less time, less noise, and a little less quality then the high one. But I guess I'll have to test some possibilities to get there.

Thanks to all!

[dgorsman]

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@Anonymous wrote:

Hi, dgorsman. You were right. I copied the high quality configuration to custom and ran the rendering for about 28 passes (Revit default were 20) and the noise desapeared. But I still think it is conected with my computer configurations. Because when I used another PC I needed less passes and less time to get a clean image in high quality.

I would like to know what can I change in the PC or what should I change in the configuration, since medium quality doesn't get noisy. I would like to render somewhere between the two configurations, with less time, less noise, and a little less quality then the high one. But I guess I'll have to test some possibilities to get there.

Thanks to all!

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You'll have to fiddle around with the settings a bit.  The "medium" settings sacrifice a bit of quality in shadows, but that's still my preferred default setting.  Turning down light quality is usually the biggest impact.

You can also simplify what needs to be rendered i.e. don't try to simulate actual lights, use ambient light and a few strategic omni lights to get the overall light levels, and add a couple of spotlights to add highlights.  Material selection can also be important - transparency, reflections, and bumps all add processing time.

Rendering time for CPU renderers (like in Revit) is affected by the number of cores (including hyperthreading) and clock speed.  RAM can also come into play e.g. if you have 36 cores available and only 16 GB RAM, some of the render threads may end up starved for RAM.  It's better to have a modest number of cores, at a very high clock speed for rendering e.g. 4- or 6-core at ~ 3.5 GHz or faster.  Once you start getting into more cores, available clock speeds are lower and cost goes up.