[x3d-public] ANARI+x3d = standard x3d raytracing?

Tue Nov 28 08:48:13 PST 2023

Hi Doug.  Thanks for sharing this idea about BVhacker.

*	https://bvhacker.com

Not understanding “don't think x3d.py is useful as a scene graph” since it is simply a pure python library for creating valid X3D scene graphs.

No one as reported looking at Khronos ANARI with respect to X3D.

*	Anari Cross-Platform 3D Rendering Engine API
*	ANARI significantly simplifies the development of applications in domains such as scientific visualization by providing high-level functionality to build an in-memory scene representation to be rendered without need for low-level graphics code, and enabling the use of any 3D rendering engine that supports the ANARI API. ANARI has already been widely integrated into scientific visualization applications, and is expected to be used by diverse applications needing portable access to multiple rendering engines delivering sophisticated 3D functionality such as ray tracing and global illumination. 
*	https://www.khronos.org/anari

Hopefully there will be an update to x3d.py sometime in December addressing some noted issues – our recently updated X3DUOM helps.  The emails about x3d.py (and also Blender) are so scattered that it is hard to tell what is going on, am bracing for a long period of spelunking when the time comes.

If there is anything in particular that x3d.py might do to complement your efforts, perhaps helping with a potential adaptation of bvhacker functionality, all issues/examples/insights will be welcome.

Have fun with X3D!

all the best, Don

-- 

Don Brutzman  Naval Postgraduate School, Code USW/Br        brutzman at nps.edu

Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA    +1.831.656.2149

X3D graphics, virtual worlds, navy robotics https://faculty.nps.edu/brutzman

From: x3d-public <x3d-public-bounces at web3d.org> On Behalf Of GPU Group via x3d-public
Sent: Tuesday, November 28, 2023 8:21 AM
To: Extensible 3D (X3D) Graphics public discussion <x3d-public at web3d.org>
Cc: GPU Group <gpugroup at gmail.com>
Subject: Re: [x3d-public] ANARI+x3d = standard x3d raytracing?

I was thinking of porting BVhacker to python for platform portability, adding some functions including loading hanim, and using opengl in python to render.

But what's missing is a scene graph. I don't think x3d.py is useful as a scene graph. Perhaps x3d.py could work like Blender x3dv - as an import/export intermediary, and anari2x3d (a2x_) and x3d2anari (x2a_) would be like the b2x_ functions in blender x3dv exporter. And once those functions are developed then the anari scene graph could be used in other applications.

-Doug

On Tue, Nov 28, 2023 at 2:57 AM John Carlson via x3d-public <x3d-public at web3d.org <mailto:x3d-public at web3d.org> > wrote:

Have you wanted to do raytracing in x3d across a range of graphics cards, but had no way to do low level stuff?  Consider the ANARI industry standard 1.0 API SDK:

https://github.com/KhronosGroup/ANARI-SDK <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FKhronosGroup%2FANARI-SDK&data=05%7C01%7Cbrutzman%40nps.edu%7Cb551838a1a884a6ba56e08dbf02e21e7%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638367853627193970%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=ubLBMViLuKo0Q%2FqHUiOAghsoLelFt1X0B4G1x9XoaSA%3D&reserved=0> 

ANARI is close to X3D Interchange profile, including cameras and lighting.

I’m open to requests for X3DJSONLD JSON inputs to ANARI python, C and C ++ output, but I’m not going to do it unless someone wants it, and can test my products.  I don’t have a raytracing card myself.  I will probably render X3D to USD for my testing.  My preference would be to use Python output, since that is allied with USD.

If you want to start with XML or VRML and skip X3D JSON, seek elsewhere.  I can provide assistance to those who need conversion to JSON.

Since ANARI is close to Interchange format, there’s probably no reason to write an ANARI renderer for other X3D profiles, but someone else may want to try.  I don’t believe there is an X3D Loader for ANARI either.  I’m not interested, as I am interested in program synthesis.  X3DJSONLD is my X3D Loader, which comes before program synthesis.

I don’t believe there is animation with ANARI, but there is an ANARI addon renderer for Blender and an ANARI backend to USD converter for Omniverse (or something like that).

ANARI does have PBR, I’ve heard.

I have heard of people using ANARI with OpenXR.

I’m just looking for an excuse to try it out and no marketing or sales implied.  I’m a volunteer, with quite a bit 3D training in college, including writing a raytracer.

John 

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