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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Roy Hirshkowitz replied to Peter Milner's discussion Sun settings
"In this case, yes, it's subtle.  It's only readily apparent in the reflection of the window in the upper right quadrant of the sphere (as expected) where a small, bright, reflection of the solar disk can be seen.  I'm…"
Apr 27
Peter Milner replied to Peter Milner's discussion Sun settings
"Here is the same test with a glossy object. There is a very subtle difference in the reflection and the lighting. "
Apr 27
Rich Rosemann replied to Peter Milner's discussion Sun settings
"I'm very good at optical mis-conclusions. "
Apr 26
Roy Hirshkowitz replied to Peter Milner's discussion Sun settings
"Looks like there's some code to handle this in both the path tracer and hybrid engines.  A little unclear in the packet tracer."
Apr 26
Roy Hirshkowitz replied to Peter Milner's discussion Sun settings
"I'll have to look to see which engines respect that switch, I can't remember off-hand.  It controls whether glossy reflections get a contribution from the direct sun component.  The easiest way to see it would be to create a…"
Apr 26
Peter Milner replied to Peter Milner's discussion Sun settings
"If you flick between the two images full screen, there is actually no difference at all. Seeing one above the other makes them look slightly different, but it's just an optical illusion."
Apr 26
Rich Rosemann replied to Peter Milner's discussion Sun settings
"One image does seem to be a bit brighter.  Maybe it opens up the shadows a bit.  Or raises the ambient light. .....or something."
Apr 26
Peter Milner posted a discussion

Sun settings

Under the Sun settings, what does Sun Highlight do?I've tried it set to 0 and 1, but there doesn't seem to be any difference.See More
Apr 26

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