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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hi roy i understand now there are a few engines u have developed for nxt. can advise which of the engine is more stable and have faster rendering time ?

Engine 2 and 3 have basically been abandoned.  I'm going to remove them soon as an option-- don't use them.  Engine 4 is most likely to be retained for the future.  It should be stable.  Whether it's faster depends a lot on your scene.  The original engine is usually the fastest.

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OYEBANJI EMMANUEL posted a photo

test 7 pass 515 (1) (1)

My first exterior render with accurender
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George Ioannidis commented on OYEBANJI EMMANUEL's photo
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"Looks really good. The glass table material is more than convincing."
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OYEBANJI EMMANUEL posted a photo

coastal chic final

My first major render with accurender studio and autocad.
Apr 29
Roy Hirshkowitz replied to OYEBANJI EMMANUEL's discussion Questions on problems encountered with accurender studio
"Really nice work-- is the modeling done in AutoCAD?  If so, consider creating a gallery of your work and submitting this photo.  Photos have to be approved, but generally speaking work of this quality will be. For some of your original…"
Apr 25
OYEBANJI EMMANUEL replied to OYEBANJI EMMANUEL's discussion Questions on problems encountered with accurender studio
Apr 25
OYEBANJI EMMANUEL replied to OYEBANJI EMMANUEL's discussion Questions on problems encountered with accurender studio
"Good day Sir, I just updated accurender studio to the latest version and found out that most of my questions have been answered. I can see the increase in speed, the update speed, material library ui and the speed of the rendering. Please Roy, keep…"
Apr 25
OYEBANJI EMMANUEL posted a discussion

Questions on problems encountered with accurender studio

1.Have you released a version that can accept jpeg ?2.Is the speed of the last version you created, higher thanthat of the first version ?3.Why cant we easily update to the latest version ?4.Why cant we use the background function to place things behind the windows for interior rendering ?5.I must really commend you because this software has a futureand if improved upon, can become the best rendering software inthe industry. I currently use vray for my production and willlike accurender studio…See More
Apr 22
OYEBANJI EMMANUEL replied to Peter Milner's discussion Workstation and render farm
"Good day Peter Milner, Thank you so much for your assistance the last time. Please, i need to know the material settings for the window blind and workstation table leg and also the pendant lamp, glass and chrome legs in this render. Once again,thank…"
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