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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Roy Hirshkowitz posted a discussion

AccuRender Studio

Starting a new thread...Latest version of AccuRender Studio is here.  Among other changes:ArStudio command automatically loads the model and begins interactive rendering in addition to bringing up the Control Panel palette.Decal interface has been redone to include multiple decals and cylindrical projections.Legacy data is being handled a little better.See More
Nov 19
Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"Thanks Roy. That did the trick. I just have to wrap my head round the logic behind it."
Nov 11
Roy Hirshkowitz replied to Roy Hirshkowitz's discussion AccuRender Studio
"Here's how you adjust the overall transparency--  Edit the Decal material in the Material Editor. Go to Opacity and change it to 0 using the slider (I may do this automatically at some point). Edit the Opacity Map (not the Color Map) by…"
Nov 10
Roy Hirshkowitz replied to Roy Hirshkowitz's discussion AccuRender Studio
"Strength is supposed to do that-- I'll verify.  I'm working on a few things right now-- should have a build for you by tomorrow or so.  Some legacy items are not persistent, including materials (you should only need to have the…"
Nov 10
Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"Also, when I reduce the strength of the decal, instead of becoming transparent, it becomes grey. How would I set it to show some base material coming through?"
Nov 10
Peter Milner replied to Roy Hirshkowitz's discussion AccuRender Studio
"Adding the decal from fresh using ARDECAL worked, even with my version. Next question: how do I add more than one decal to an object?"
Nov 10
Brittany Watson posted a discussion

Velvet Material

Hi, I am wondering if anyone has suggestions to how to create a decent velvet material (its for curtains).See More
Nov 5
Roy Hirshkowitz replied to Roy Hirshkowitz's discussion AccuRender Studio
"Sorry-- I was out of town for a few days. You should be able to replace the decal using the ArDecal command and it will handle everything automatically-- just use the png provided. -OR-- If you want to use the material editor you'll need to…"
Oct 30

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