AccuRender nXt

advanced rendering for AutoCAD

Coming soon-- path tracer only.  Architectural applications are probably limited-- but it's interesting new territory anyway.

 

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Here's a blend of SSS and procedural marble:

 

Will do well in certain ceramic tiles

 

There is very well function of nxt, thank you! :-)

Here's a different use of a similar technology:

Is that fog I see?
In this case, confined to a box 1 meter high.  Uses subsurface scattering techniques...
What's the point of this technology?
I'm not sure I understand the question.  Do you mean "what are the applications?"
I just want to know what exactly your message means - Subsurface scattering - is it some new funcionality in nXt? What's so special on these pictures? What gives this technology?

There's an ok summary of subsurface scattering on Wikipedia.  It's an industry standard term so there's quite a bit about it out there.  Here's another decent article.

 

Generally speaking, the lighting in nXt and all previous versions of AR occurs at the surface only.  Subsurface scattering is essentially a volumetric technique, where interactions also occur within the medium.  It's required to accurately model materials which we think of as "translucent".  It's also helpful with materials where the light penetrates the surface a little bit-- such as the marble dragons-- and then scatters on its way out.  The feel of the images above would be very difficult to achieve without this technology.

 

A similar technique can also be used to model other participating media, such as the ground fog above.  This has a very different feel than previous fog implementations.  The technique can be extended to model non-homogenous participating media-- things like smoke or non-uniform fog (clouds?) etc..

 

Downside is that it can take a long time to resolve these materials-- accurate simulations almost require a path tracer approach.

Thanks a lot for this explanation. Looks promissing.

BTW. I found the Path Tracer the most interesting and valuable feature of nXt. It gives realy soft light (for the first time in whole AR history). But it's not perfect - it's slow - sometimes even hours and houndreds passes don't fix the noisy areas. I'd like to ask you - are you planning to develope this engine? I think it realy worth it.

It is being developed-- subsurface scattering is an example of this.  I'm working on a stand-alone version of the engine as well.

If you mean-- will the performance improve substantially?-- I don't think so.  I don't have any magic wands to wave at the moment.  One of the things I'm going for with this engine is simplicity.  None of the really technical items matter to the path tracer-- for example: Glossy switches, daylight portals, ambient lighting settings, etc.. have no effect.  The combination of this simplicity and the calculation of more light paths slow the thing down-- quite substantially in the case of interior daylighting.  The above mentioned stand-alone has almost nothing to set.

I'm also investigating another engine that has the potential for even more accurate simulations-- probably a little slower, though.

On the bright side-- computers continue to get faster.

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norton torres posted a photo
2 hours ago
Eric Clewes posted a photo
2 hours ago
akinlolu olugboji replied to Albert D Hart's discussion New nXtRender 0343-NI04
"No addons installed. In the 64 bits versions, after the needed appload, the Layer Material Schemes work once you click the bottons but in an attempt the save the present scheme it freezes, both in AutoCad 2014 and 2015."
19 hours ago
alan replied to alan's discussion Distortions in nXt renderd AutCAD Architecture Curved Walls
"Yes, Roy, the units were correctly set but the model was very far from the origin (forgot about that issue).  Looks fine now.  Thanks very much for your prompt reply."
yesterday
Roy Hirshkowitz replied to alan's discussion Distortions in nXt renderd AutCAD Architecture Curved Walls
"This is typically a units problem or a coordinate system problem.  Check the units by typing _DDUNITS at the command line and looking at the insertion units.  If they're correct, make sure the model is not located too far from the…"
yesterday
Garret Diduck replied to Albert D Hart's discussion New nXtRender 0343-NI04
"I'm using Win7 64bit and ACA2014."
yesterday
alan posted a discussion

Distortions in nXt renderd AutCAD Architecture Curved Walls

Please see the attached images.  In AutoCAD Architecture's native renderer, and in its 3d display, the curved walls appear smooth.  In nXt the materials are uneven (with sometimes extra lines that protrude from the walls).  Distortions also appear in straight walls which should be flat and smooth though the problem is less pronounced.  I tried changing the material definitions but the problem persists.  Could this be some sort of scale definition issue?The problem persists with all the…See More
yesterday
Rich Hart replied to Albert D Hart's discussion New nXtRender 0343-NI04
"I cannot duplicate this here either. Do you happen have the "Add-ons for nXtRender" package installed on your machine? That would cause all kinds of problems, since it included older versions of the nXt modules. Look…"
yesterday

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