Search found 138 matches

by shiqiu1105
Tue Jul 14, 2015 8:16 pm
Forum: General Development
Topic: Question about normal mapping in Ray tracingIt looks like al
Replies: 7
Views: 4894

Question about normal mapping in Ray tracingIt looks like al

It looks like all the ray tracing renders I found online uses bump mapping, including me tuba mitsuba, PDRT and in all of the graphics courses taught at the Universies too.however real-time graphics uses normal mapping which is supposed to be better than bump mapping in terms of the ability to pertu...
by shiqiu1105
Mon Jul 06, 2015 11:59 pm
Forum: General Development
Topic: pbrt-v3 source code now available
Replies: 23
Views: 15864

Re: pbrt-v3 source code now available

Hi Matt, Really looking forward to the book! I took a brief at what you updated in v3, and it looks like some of the recent advances in gradient domain integrators have not been included. Such as gradient path tracing and bidirectional path tracing. I personally feel like these are really impactful ...
by shiqiu1105
Fri Jul 03, 2015 7:41 am
Forum: General Development
Topic: Looking for textures for material preview scene
Replies: 2
Views: 3381

Looking for textures for material preview scene

Hi all, I am trying to render material preview images like this with my own renderer: http://blenderartists.org/forum/attachment.php?attachmentid=326162&d=1407755382 And right now I am lack of two things. The good looking tiled texture on the floor, and some ball mesh like that to apply the mate...
by shiqiu1105
Thu Jan 22, 2015 1:31 am
Forum: General Development
Topic: About the implementation of Joint Importance Sampling
Replies: 4
Views: 2044

Re: About the implementation of Joint Importance Sampling

I understand that BDPT is one of the estimators used in your latest UPBP, so is this joint sampling used in that framework as well? The joint importance sampling techniques weren't actually used there (couldn't do it on time), but they can certainly be added to improve sampling. Thanks for the info...
by shiqiu1105
Wed Jan 21, 2015 1:12 am
Forum: General Development
Topic: About the implementation of Joint Importance Sampling
Replies: 4
Views: 2044

Re: About the implementation of Joint Importance Sampling

Unfortunately, there is no public implementation available, due to potential legal problems (the work was done at Disney Research). However, implementing the analytical importance sampling routines is actually quite easy. For this what you really need are the boxed equations in section 5. The tabul...
by shiqiu1105
Tue Jan 20, 2015 10:20 pm
Forum: Links & Papers
Topic: Joint Importance Sampling of Low-order Volumetric Scattering
Replies: 8
Views: 7913

Re: Joint Importance Sampling of Low-order Volumetric Scatte

Hi, just want to ask is there an implementation of this publicly available anywhere?
I wish to implement this in my renderer and a reference would be really handy.
by shiqiu1105
Tue Jan 20, 2015 10:09 pm
Forum: General Development
Topic: About the implementation of Joint Importance Sampling
Replies: 4
Views: 2044

About the implementation of Joint Importance Sampling

Recently I am very interesting in this Joint Importance Sampling: http://www.ci.i.u-tokyo.ac.jp/~hachisuka/jis.pdf It seems to reduce the variance of volume rendering a lot. But it looks quite complicated to implement, especially when considering the tabulation in anisotropic phase function. So is t...
by shiqiu1105
Sun Dec 07, 2014 5:35 am
Forum: General Development
Topic: Question about particle volumetric rendering in Krakatoa
Replies: 1
Views: 1965

Question about particle volumetric rendering in Krakatoa

Hi, I am insterested in how Krakatoa renders the volumetric effect just with particles. It seems to be splatting particles to the framebuffer directly. But it also does some kind of volume scattering. Any one know how exactly the algorithm works? Any papers, books, docs on this? Here's the link to t...
by shiqiu1105
Thu Dec 04, 2014 1:21 am
Forum: General Development
Topic: About ray differentials of primary rays
Replies: 2
Views: 1551

Re: About ray differentials of primary rays

Maybe, not sure how the math works.

I think it should depend on the fov, film resolution.
by shiqiu1105
Tue Dec 02, 2014 8:31 pm
Forum: General Development
Topic: About ray differentials of primary rays
Replies: 2
Views: 1551

About ray differentials of primary rays

Hi,

I am writing to ask about the ray differentials for primary rays if they don't hit anything.
I still need the differentials info to sample environment map, but how should the differentials be calculated?

Thanks

Go to advanced search