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How raytracing works Vray/DMC
show user profile  zeefusion
I have posted this over at Chaos forums but thought I might get a good answer here to.

I have been readinghttp://www.interstation3d.com/tutorials/vray_dmc_sampler/demistyfing_dmc.html
and I am trying to sum it up in my head, how raytracing works and how samples are created.

A ray travels from the camera and through a pixel and out the other side until it hits an objects surface. If fixed amount of 1 is used then it returns 1 sample back to the pixel that contains information to colour that pixel. But if adaptive is used at the point it hits the surface of the object it can then decide how many samples it needs to return to the pixel in order to render it correctly and more efficiently. You can control the number of samples available for it to decide from through thresholds and subdivision values via lights, materials etc.

Is that right?


read 1078 times
10/11/2011 12:05:02 PM (last edit: 10/11/2011 12:05:15 PM)
show user profile  zeefusion
Any clarification on this? Just trying to loosely understand how the actual process works.
read 1034 times
10/12/2011 3:04:28 PM (last edit: 10/12/2011 3:04:28 PM)
show user profile  3joez
I've been using professionally Vray for one year, and yes, though I cannot phisically see the process, that is
the way I've interpreted the whole thing. The resolution seems like it acts like a first grid. Inside the holes (the pixels) you can make the samples smaller, like stones passing through a sieve. The smaller the stones (the samples) the more accurately they can pass through the grid (the pixels) and determine
the final pixel color.

I'll share an interesting link, which covers indirectly the topic, but there are others around, as soon as I find them again, I'll post.
http://www.jamesshaw.co.nz/blog/?p=542


read 1016 times
10/12/2011 6:11:19 PM (last edit: 10/12/2011 6:57:42 PM)
show user profile  3joez
There you go
http://www.interstation3d.com/tutorials/vray_dmc_sampler/demistyfing_dmc.html

read 1004 times
10/13/2011 8:38:59 AM (last edit: 10/13/2011 8:38:59 AM)
show user profile  zeefusion
Not to point out the obvious but... That was the link I quoted in my first post.

Its a lot of information to take in so I was summing up what I think is right. :)
read 996 times
10/13/2011 9:13:24 AM (last edit: 10/13/2011 9:13:24 AM)
show user profile  3joez
Ops, sorry, I didn't notice.

And moreover, I should state that I've learned Vray a lot from your site, so I don't think I can really help that much.

Anyway, here's antoher book, that covers the topic. I've read it only partially, but it is a good Vray resource.
http://www.francescolegrenzi.com/blog/static.php?page=vray_guide_eng


read 993 times
10/13/2011 9:34:52 AM (last edit: 10/13/2011 9:41:58 AM)
show user profile  zeefusion
I am glad you find my site useful. There is still a lot I don't fully understand, mostly technical stuff such as this. Hoping to write up about it soon when I get my head around it all.

Thanks for the link, I think I have this somewhere. But have yet to dive fully in to it.
read 987 times
10/13/2011 9:47:12 AM (last edit: 10/13/2011 9:47:12 AM)
show user profile  Bolteon
"Is that right?"



for the most part, yes.

-Marko Mandaric



read 969 times
10/13/2011 7:28:39 PM (last edit: 10/13/2011 7:28:39 PM)
show user profile  zeefusion
Thanks :)
read 949 times
10/14/2011 9:03:56 AM (last edit: 10/14/2011 9:03:56 AM)
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