Rendering Time Issues on MacBooks

Hey guys, I know this is regarding a 3rd party plugin : VRay. Just wanted to get some suggestions in general, I use a MacBook Pro (Non-Retina) 16GB RAM with on-board Intel HD Graphics 4000. I do know it’s not a specs to do much 3D Rendering.

I’m a student and Till I upgrade to a dedicated Windows Workstation, this is my only option. I’m using VRay to Render and the final outputs of standard resolution (2000 x 1100) takes so much time! It’s still in progress while I’m typing this and it usually takes more time to render (like even days). Can anyone help me out?

Have you investigated the use of render farm services?

Render farm for students?? I think that’s too expensive for them.
@baranikarthik Maybe you can tell us a bit more of what you are doing? Are you doing Architectural Renders? interior or exterior? Can you post an image of one of you renders? Without knowing what you are trying to accomplish, it is hard to help…

Hey @jespizua thanks for your response.

I’m learning rendering for the past two weeks or so. I’m an Architecture Student, so yeah. Architectural Interiors for now. I have attached my work in progress file. It’s not a screenshot, just a poor picture from my iPhone. I’m using trial softwares both now. I was able to model this pretty quick, but maybe since my MacBook runs on Intel HD 4000 Graphics (Can’t make use of GPU), and Vray somehow couldn’t utilise most of my Memory available (I have 16GB of RAM).

Please suggest me, If there’s anyway I can manage to workaround for renders on my laptop. I can’t afford for an upgrade yet. I’ll be doing it soon. Until then.

Hello @Julian_Smith I have heard of render farms. I’m just learning now. for now all I need is to get some decent renders off my laptop. I’d always love to know some options, Renderfarms, hmm… I’ve been thinking they were only used by big animation companies and moviemakers. It’s more common nowadays. I can see things have got cheaper too.

I haven’t tried VRay so I don’t know how it compares, but I’ve been using Twilight Hobby with my 2014 13" 16GB rMacbook with integrated Intel graphics (Iris 5100) with success.

As long as I use the less-demanding rendering settings (takes a bit of playing) and am judicious with textures and lighting sources, I can bake a decent sample render in 5-10 minutes and final images in about 4 times that.

My render needs aren’t that demanding, so I’ve been quite pleased with the simplicity and performance of Twilight. You might want to check it out.

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I don’t use Vray, but what I think is that if such a simple scene takes days to render, there is something wrong with your settings, materials or both. Maybe someone knowledgeable with Vray (@filibis ?) could put you on the right track - with most rendering applications it is often possible, with some tweaking, to reduce rendering time with little or no decrease of image quality.

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As far as i know Vray make use of either CPU or GPU (or both -Hybrid-) and not RAM while rendering.

Generally people ‘overuse’ some features of Vray that makes everlasting renders. Those can be related to material or render settings. For such bathroom scene it shouldn’t take more than 5-6 hours with your specs.

Some questions/suggestions to move on:

1- Are you using new Vray 3.6 (released yesterday) or 3.4 version?
2- Could you please share your render settings (Try Irradiance Map + Light Cache for Global illumination. Brute Force is way slower but more accurate)?
3- Are you using displacement or bump maps or caustics? Using excessive of these features can increase render times quite a lot. (Same goes for reflective and refractive surfaces.)
4- Refer to this official Vray manual to understand the features and their properties.

Note: Also make sure you everything is properly modeled and front faces are facing the camera.

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Hi there, from my experience it really shouldn’t take that long with the scene you have. The render should certainly not take days. Vray normally uses your CPU core and thread count so the more of those ultimately the better. Your GPU will probably not be utilised at all, I render on a workstation with a £500 graphic card and that doesn’t get used at all, so that wont be the problem.What I would suggest its go over your setting:

  1. Make sure your rendering with Irradiance Map and Light cache and always render to a VRIMG for complex scenes.(saves RAM)
  2. Also a 2k resolution like 2560x1440 is a high enough quality to capture enough detail. So much more than that will hammer your render times.
  3. I’m not sure what version of VRay you have but use “Denoiser” if you have the option really helps to cut down render times.
  4. Only ever use displacement maps when you have to, avoid them at all cost especially if you only have 16GB RAM to spare, use bump or normal maps instead.
  5. RAM is CRUCIAL especially with complex materials and scenes, once your RAM runs out Vray will start using your hardrive to cache all the data it needs and that is far far slower than using RAM. You can tell when your RAM is bottlenecking your performance if your CPU isn’t at 95-100% usage but your RAM is maxed out and Hard drive is constantly writing.
  6. Purge excess materials and models you don’t need. Also if you have repeating models make them components and copy them as an instance. This will help lighten up your model.

Try all these things, if it doesn’t cut down your times to a what you wish they will definitely help.


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Hey @filibis Thanks for your response!

  1. I’m using the 3.4 version, yes. Not aware that a new version got out.
  2. How to share my settings? .visopt? I’m using Irradiance Map and Light Cache, yes! I didn’t play around very much with the settings except for the Camera settings (I usually modify the ISO and shutter speed), The Output (Resolution and adjustments), Possibly the Environment settings (Lightning part).
  3. I’m not using any bump or displacement maps except for a single vismat I downloaded from a website.
    But, I do have a lot of reflective and refractive objects, glass and mirror material. (But, since this slow performance is pretty general, does it matter?)

Thank you @chimmysmurf3 amazing tips! I’m gonna make sure I follow those.

Can you tell me how to save that VRIMG for complex scenes? Is it the light cache save file option on settings?

Just a screenshot for us to see…

For a test, make sure you made it to default settings and not using any adjustment (See bottom of the Vray window to revert default render settings).
Also replace all reflective and refractive material with a simple color and see if it speeds up.

Can you share your SketchUp file (.skp) here?

Yeah no problems I struggled with long render issues myself especially sucks when you have deadlines to meet too. But it can be found in the Vray Settings > Render Output > Save Image > Makes sure is tuner on > (Click on the paper icon)

The create a filename as in the “Save as type” it should be at the very bottom .

Hope this helps, you will need to convert it to exr after its done with a tool Vary provided in your install. Look on their website how to use it its very simple and quite useful.


You may want to switch over to Theo or SU Podium which may work better with you limitations.

Try enscape… almost one-click solution

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