AccuRender nXt

advanced rendering for AutoCAD

This one introduces two new engines.  Both of these are very experimental at the moment. I may not retain either of them if they don't prove useful.  Although they appear very stable, there may be some hidden bugs.  Be careful using these for production until we have some confidence in their stability and characteristics.  The engines are only accessible via the nXtEngine AutoLisp command use (nXtEngine 2) -OR- (nXtEngine 3).


Both engines include more light pathways than the current product does and can therefore potentially provide more accurate solutions.  Two "tricks" which are used in the first two engines, transparent shadow rays and daylight portals, are not used in these new engines.  This gets rid of two big sources of inaccuracy.  Caustics pathways are automatically included.

Engine 2 can be much less noisy than the Path Tracer for most interiors.  It's convergence, on the other hand,  is not as graceful and will include some discrete artifacts.  It's usually a lot faster than the Path Tracer for interiors.

Engine 3 is a little more accurate than Engine 2, particularly when window coverings are involved.  It converges more gracefully, but slower for some interiors.  It is considerably faster on some exteriors.

Some things to keep in mind with these engines:

  • Light leaks in the corners are possible when doing interiors.  Make sure walls, floors and ceilings are modeled as slabs with thickness.
  • Both engines start slowly and accelerate.  Pixels/sec should increase as they proceed.
  • Using accurate IORs is very important.  IORs of 1.00 should not be used for glass.
  • Designating glass as Thick/Thin is more important with these engines.
  • Translucency is not implemented.  Allow Surface Roughness is.
  • These engines use more memory than the previous two.  64 bit is recommended.  Start your testing and low resolutions.

Let me know what you think-- I'm looking for feedback here.


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Try it again now.

Now it's ok. Thannk's Roy!!!!

I can minimize both rendering and walkabout window in both engines. 

Am I missing some components of ACAD? nxtengine command does not exist... How to go back to engines 0 or 1?

 i downloaded new build 292,but the command line is showing  Unknown command "NXTENGINE3".  Press F1 for help, is it bcos am using trial version and 32 bit?


got it 

Hi Roy, I am loading a model  (80 MB)  when I tried to use (nxtengine 2) autocad  nxt crashed,  I open the walkabout window, press the render button, the model start to load when it finish and  preparing render  window appear it crash.  I tried at least four times and always the same. I can load this model with (nxtengine 3)

I  tried with another model (no so heavy) 29 MB, and the image start rendering.

I have one question about rendering quality, Is normal with both engines at the beginning to have big spots on the image?  (see attached)

The same here. When nxt finishes loading the model, Acad shuts down.

32 or 64 bit?

64 bit. See my further comment. Engine 2 crashes, engine 3 works.

64 bit here and no crash on both engine.

Not as much spots, noise only on shiny materials. 

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N` Goraw posted a photo
Oct 11
Roy Hirshkowitz replied to Douglas Thompson's discussion Accurender 3 + Acad ADT3 + Windows 10
"I really have no idea.  This software hasn't been supported for more than a decade.  Anything you can get to work will be fine from a licensing perspective, I just don't have much to offer you."
Oct 5
Douglas Thompson posted a discussion

Accurender 3 + Acad ADT3 + Windows 10

Wonder if anyone can help. At home I run Windows 7, at work I have Windows 10.At home I use Accurender 3 with Acad ADT3, installed by loading my old Accurender 3 disk, the  downloading the latest *arx file, which I see on my home computer is Accuren3_2000.Can I still download the Accuren3_2000 update from anywhere, and will it work with the office set up anyway? I have tried simply copying the Accuren3_2000.arx from home to work into the Accurender folder in the usual location, but when trying…See More
Sep 29
Roy Hirshkowitz replied to norton torres's discussion I GOT AN ERROR WHILE RENDERING IN AUTOCAD 2010
"I'm guessing it's the same problem.  nXt has to be present for a conversion to work properly with a drawing that has nXt data.  That's a known issue.  Converting using any other method probably will not work properly if…"
Aug 23
George Ioannidis replied to norton torres's discussion I GOT AN ERROR WHILE RENDERING IN AUTOCAD 2010
"I think Norton mentioned that he did the conversion using TrueView, not the AutoCAD itself. He is still on ver. 2010 I suppose, otherwise he could do renderings directly in 2018. Maybe TrueView isn't quite versionwise correct as regards to…"
Aug 21
Roy Hirshkowitz replied to norton torres's discussion I GOT AN ERROR WHILE RENDERING IN AUTOCAD 2010
"One additional thought.  A known issue when saving drawings to a previous version is that nXt must be loaded and running before you convert the drawing. Try the following: 1. Open your 2018 drawing in AutoCAD. 2. Start nXt by typing…"
Aug 1
Roy Hirshkowitz replied to norton torres's discussion I GOT AN ERROR WHILE RENDERING IN AUTOCAD 2010
"Interesting.  I'm not sure what I can do about it-- the oldest AutoCAD I have available for testing is 2013.  AutoCAD 2010 is actually 12 years old which is an eternity in software.  You can try sending me a simple converted…"
Aug 1
norton torres replied to norton torres's discussion I GOT AN ERROR WHILE RENDERING IN AUTOCAD 2010
"yes... is every 3d model that I I import from autocad 2018 to autocad 2010 and  it dosent matter that I convert the drawing  in trueview to dwg 2010 it continues the error, it happens this way, I open the drawing in autocad 2010 then I…"
Jul 31

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