Search found 179 matches

by jbikker
Wed May 30, 2018 4:55 pm
Forum: Visuals
Topic: My introduction
Replies: 11
Views: 729

Re: My introduction

Hi and welcome to the board!
by jbikker
Sat Mar 24, 2018 12:46 pm
Forum: General Development
Topic: DXR
Replies: 6
Views: 1510

Re: DXR

Hi Martin, thanks for your reply!
Re: your reply: "Deformation" as in "refitting"? How many triangles can you rebuild per frame, and is this done on the GPU? And could you say something about the ray throughput of the system for average scenes (~100k tris or so)?
by jbikker
Thu Mar 22, 2018 7:57 am
Forum: General Development
Topic: DXR
Replies: 6
Views: 1510

DXR

I've been reading some materials and watching videos on DXR over the past couple of days. Some observations: - The good looking demos use 3 or 4 Titan V's. - In all cases, it's rasterization as a basis with ray tracing effects added. - All motion is rigid, i.e. no acceleration structure reconstructi...
by jbikker
Tue Feb 06, 2018 9:07 am
Forum: Scratchpad
Topic: Eurographics '18 Industry Talks
Replies: 0
Views: 817

Eurographics '18 Industry Talks

Hi all, We are organizing the industry talks session this year at Eurographics, which will be held next April in Delft, and we are looking for companies interested in giving a talk in this session. The idea of Eurographics Industry Talks is to highlight state-of-the-art computer graphics development...
by jbikker
Wed Jul 19, 2017 10:46 am
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 6205

Re: MIS with IBL

rtpt wrote:if you want to combine ris/mis have a look at the work of j. talbot and refs.


I am aware of his work, but I don't think he solved this issue, and in fact, I don't think it's possible.
by jbikker
Tue Jul 18, 2017 1:59 pm
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 6205

Re: MIS with IBL

Out of curiosity, because it sounds like I'm doing something very similar and back when I was investigating it I saw no bias issues, what is the RIS trap? Is RIS conceptually flawed or is it a reoccurring 'gotcha' that you keep forgetting? I used RIS for my light sources in the past: out of e.g. 1k...
by jbikker
Fri Jul 14, 2017 1:31 pm
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 6205

Re: MIS with IBL

You can easily test whether this indeed is the problem by using a light selection probability that is only a function of deterministically known things at the shading point (i.e. every time you land at this point you will compute the exact same light selection probability). That is indeed correct: ...
by jbikker
Tue Jul 11, 2017 2:45 pm
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 6205

Re: MIS with IBL

Just to be sure, the sample you're taking to calculate the probabilities is being discarded right after that and not being reused? Correct. Out of curiosity, how do you notice that there's bias? Well the setup is a simple box with a single-sided quad light well below the ceiling. One side of the bo...
by jbikker
Mon Jul 10, 2017 6:23 pm
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 6205

Re: MIS with IBL

Thanks for your replies. When your ray stumble upon a light source and you want to do MIS, you need to know the probability of it being selected. It's impossible to know if that probability without having sampled random points on all other light sources in your sampling method. I'm not sure if doing...
by jbikker
Thu Jul 06, 2017 10:51 am
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 6205

MIS with IBL

Hi all, I have a question about something that I can't seem to wrap my head around. Here's the situation: In a unidirectional path tracer with next event estimation and MIS lights can be reached by a random bounce and by explicitly sampling the light source. For MIS I thus take both pdfs into consid...

Go to advanced search