any more detail on what vraypattern is actually doing?

robinlawrie
Posts: 5
Joined: Mon Mar 14, 2011 11:17 pm

any more detail on what vraypattern is actually doing?

Postby robinlawrie » Tue Mar 15, 2011 12:00 am

There has been limited info as to exactly what vraypattern is doing "under the hood"

Of course you want to protect what is obviously a very clever bit of code, but im not after the source code or anything, but a better description of how it differs from scattered proxies in terms of geometry handling, how it is related to the displacement system (its hard to picture it being based on the displacement system.. it seems to do a very different thing) also comments like "its good where high accuracy isnt needed" or "its not good for trees, better for things like grass" id like to know more of why.. does it prefer low poly source meshes? what are the accuracy issues? is it better to have a large tile and few repetitions or a small tile and lots of repetitions?

is there scope in the future to support things like varying scale/rotation etc over the tiled surface? or is it inherently impossible..?

also, things like... does it deform the source mesh over the target mesh, or tile them without distortion, aligned to the normals below.. also.. can the tiles overlap? what limitations are there on modifying the vraypattern? can we give an overall texture to it? apply uvw mapping etc? can we mix the original materials with overall ones?

at the moment it seems a little like witchcraft, rendering unlimited polygons without using very much memory... how does it differ from instanced geometry?

knowing more about how it works would definitely help deciding whether its really useful for my workflow...

GeorgeR
Posts: 15
Joined: Fri Jan 28, 2011 9:01 am

Re: any more detail on what vraypattern is actually doing?

Postby GeorgeR » Tue Mar 15, 2011 9:58 am

It's better not to think of it as geometry. Consider reflection and refraction - there's no instancing going on, just raytracing and matrix manipulation.

robinlawrie
Posts: 5
Joined: Mon Mar 14, 2011 11:17 pm

Re: any more detail on what vraypattern is actually doing?

Postby robinlawrie » Tue Mar 15, 2011 7:03 pm

ok thats a start.. i can picture that.... any more?

robinlawrie
Posts: 5
Joined: Mon Mar 14, 2011 11:17 pm

Re: any more detail on what vraypattern is actually doing?

Postby robinlawrie » Mon May 09, 2011 9:07 pm

it really would help to get more info about vraypattern this post has been up for ages, and ive had exactly 1 line of reply. id like to give you some of my cash, but i want to know some answers to my questions before i decide... anyone? admin?

anvar
Posts: 433
Joined: Sun Jul 11, 2010 12:34 pm

Re: any more detail on what vraypattern is actually doing?

Postby anvar » Mon May 09, 2011 9:20 pm

have you tried to render sample files?

rs3d
Posts: 5
Joined: Wed Nov 10, 2010 4:48 pm

Re: any more detail on what vraypattern is actually doing?

Postby rs3d » Fri Jan 27, 2012 4:27 pm

Is it based on any scientific paper, would also like to know more...

admin
Site Admin
Posts: 448
Joined: Fri Jan 23, 2009 7:44 pm

Re: any more detail on what vraypattern is actually doing?

Postby admin » Tue Jan 31, 2012 2:56 pm

VrayPattern based on Vray SDK possibility to create geometry based textures. This technology is close to vector displacement. We are using some ready algorithms provided by Vray SDK. I think it is better to ask on ChaosGroup forum, if you want to know about base algorithms.



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