AccuRender nXt

advanced rendering for AutoCAD

用NXT这么久,唯一的感觉是太耗时间,动辄10几个小时,甚至40几个小时还不能达到满意效果。

如图:这张图用了48个小时,但是黑点依然很多。不知道各位有没有什么好的方法能够减少时间。

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Which engine?

Hybrid

How many lights?  I'd be happy to take a look, if you like.  Zip it and use the upload link above if you're willing.

请问您的邮箱是多少?

  • Difficult lighting conditions I believe.
  • Pull(or hide) out all the furniture, leaving the walls, floor, doors, windows and lights and hit render. 
  • When satisfied with the results (also ensure the space is closed/sealed no leakages or opening to Space) by they you have an idea of the number of passes(rendering at a low resolution to save time) add the other components and do the final render.

One obvious problem in the version you sent me is that the units were incorrect-- inches instead of millimeters.  You can't combine natural and artificial lighting unless the units are set correctly.  For the versions below I corrected the units and changed the intensity of the artificial lights to 100 watts from 220-- I did not change the texture scaling so this is wrong in mine.  I also went to a standard sky with sun which is usually much faster than trying to light an interior with an HDRI and no sun.  I created a multi-channel rendering and placed the lights on one channel and the sun and sky on another. 

There are some minor additional things to consider when rendering:

  • For the hybrid engine, glass in the openings can actually make the calculation go faster.  Not sure if it would help in this case.
  • Don't use omnidirectional lights for spot lights-- use the spot or diffuse pattern.

After about two hours this is what I got-- combined, lights only, daylighting only:

Thank you very much for all you say, I had not considered. These points. You helped me very much, thanks again. In China, the units are in millimeters, have been accustomed to, converted into inch more than one procedure. In addition, convenient for you to change the model to send my mailbox? 124959094@qq.com

Working in millimeters is just fine-- but you must make sure the drawing units in AutoCAD are millimeters.  DDUNITS or INSUNITS commands will work for this.

The model is a little too big to email-- send me a private message with a dropbox or equivalent address and I'll upload my version to you.  I left it running overnight:

我用Path Tracer渲染顶上的灯带没有,请问你是怎么做到的?

Again, not exactly sure what you're asking.  

My example used the hybrid engine, I would recommend it.  

In the model you sent, you did not use light sources for the ceiling indirect cove lights.  Instead, you used a material with glow.  What you see in the rendering is a glossy reflection of the glowing lamp.  This is not correct.  Use omnidirectional source for an improved simulation, but do realize that this type of lighting will result in significant noise and can take a while to resolve.

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Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"Yes, the glass material translated as Refractive automatically."
Dec 23, 2020
Roy Hirshkowitz replied to Roy Hirshkowitz's discussion AccuRender Studio
"Yeah-- like I mentioned the caustics are accurate but could be annoying.  Things that might alter it include changing the sun angle so it's not striking the chair's metal surfaces so directly, changing the roughness of the chair…"
Dec 23, 2020
Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"Here's the latest render using metallic materials. The chrome now looks a lot better. I do feel though that the reflected light on the back wall is too bright."
Dec 23, 2020
Roy Hirshkowitz replied to Roy Hirshkowitz's discussion AccuRender Studio
"Ah-- so that's a function of the material type.  The standard material won't give you a mirror anymore.  You need to change the material to metallic and you should get something more familiar.  Use the Type popdown on the…"
Dec 18, 2020
Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"Pacing a mirror on the back wall (reflections = 1.0, noise = 0.0), you can see the difference more clearly (top image is nXt)."
Dec 18, 2020
Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"You can see from these two images that there is definitely something wrong with reflective surfaces. It appears the light is being reflected, but not objects or textures. In the nXt version (top image), the carpet texture is being reflected in the…"
Dec 18, 2020
Roy Hirshkowitz replied to Roy Hirshkowitz's discussion AccuRender Studio
"It's interesting-- overall the quality of this interior is very high for that short amount of processing, and may be acceptable for certain scenes.  In this one, however, there are some reflective caustics that are taking longer to…"
Dec 17, 2020
Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"ARDECAL now works. Here's the image after 10 minutes of rendering. I do have a slight concern that reflective surfaces seem rather dull. This is particularly evident on the end frame of the desk and the base of the chair."
Dec 17, 2020

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