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sjb{3d} simon’s graphics blog posts tags email github twitter last update: 15 july at 12:00am bidirectional path tracing in participating media 15 jul, 2012 the framework for integration over path space described by veach ref1 can be extended to integrate over volumes ( ref3 and ref4 ), using the original rendering equation as a boundary condition . an alternative framework was also developed by lafortune in ref2 . in the approaches described by these papers, scattering events are sampled according to the cumulative scattering density along a ray. here is some programmer art rendered using a brute force bidirectional path tracer that implements this approach, stopped at around 1000 samples per pixel. still noisy but working volume caustics, so achieves my goals. since this is a brute force sampling (no mlt or manifolds) there are still issues with sds paths that show up as unexpected bright spots on the glass sphere. if i manage to resurrect mlt code for ref5 i’ll post an update. this post is an attempt to gather together the definitions and equations for the weighted path contribution and mis probability ratios for this sampling technique, as i’ve not seen this written down all in one place (with all of the interior terms of the weighted path contribution cancelled etc). where possible i’ve tried to use similar notation to ref1 , ref3 and ref4 . this post is unapologetically maths-heavy ! read more → multiple scattering 21 jun, 2012 experimenting with volume rendering and multiple scattering has been on my todo list for a long time, so recently i started trying to understand how scattering events fit into a bidirectional path tracer. i found surprisingly few references that deal with volume scattering in the veach framework (or more accurately, extend the veach framework to deal with this). most useful to me so far were: metropolis light transport for participating media by mark pauly, thomas kollig, alexander keller (eg 2000). manifold exploration: a markov chain monte carlo technique for rendering scenes with difficult specular transport by wenzel jakob, steve marschner (to appear in siggraph 2012). read more → bidirectional instant radiosity 8 apr, 2012 bidirectional instant radiosity is the title of a paper by b. segovia et al which presented a new sampling strategy to find virtual point lights (vpls) that are relevant to the camera. the algorithm given for generating vpls is: generate $n/2$ “standard” vpls by sampling light paths (i.e. vanilla instant radiosity) generate $n/2$ “reverse” vpls by sampling eye paths (compute their radiance using the n/2 standard vpls) these $n$ vpls are then resampled into $n^\prime$ vpls by considering their estimated contribution to the camera. finally the $n^\prime$ resampled vpls are used to render an image of the scene. in this post i’ll describe how i think this approach can be generalised to generate vpls using all the path construction techniques of a bidirectional path tracer. as usual i’m going to assume the reader is familiar with bidirectional path tracing in the veach framework . i should state that this is an unfinished investigation into vpl sampling. i’m going to describe the core idea and formally define the vpl “virtual sensor”, but proper analysis of the results will be part of a future post (and may well indicate that this approach is not advisable). read more → sampling sun and sky 30 mar, 2012 in this post i will briefly cover how i implemented sampling of external light sources in a path tracing framework, concluding with an observation about sampling multiple external light sources that are non-zero over very different solid angles. i’m going to assume the reader is familiar with path tracing in the veach framework. read more → sketchup cities 19 mar, 2012 ray tracey’s latest blog post has brigade 2 renders of a nice-looking walled city scene created using google sketchup . the model came from this gem of a collection by “lordgood” (who evidently is a big assassin’s creed fan) hosted on google 3d warehouse. currently i only have a blender exporter, and sadly the sketchup-collada-blender path was producing garbage, but even the free version of sketchup allows custom ruby plugins. after a bit of hunting around i found this obj exporter ruby plugin which worked very well, and now i have much nicer test meshes than my bad blender programmer art. read more → virtual point light bias compensation 9 may, 2011 nothing new here, just highlighting the 2004 paper illumination in the presence of weak singularities by kollig and keller. this paper presents a simple and elegant solution to the problem of clamping the geometry term when using virtual point lights for illumination. consider the following scene with two area lights (in this case rendered using a reference path tracer): read more → projected solid angle is projected 16 apr, 2011 there are two quantities flying around when writing a physically based renderer: irradiance, which is power per unit area radiance, which is power per unit area per unit projected solid angle any bsdf is the ratio between the two: a patch receives unit irradiance from some incident direction, the bsdf defines the radiance emitted for each outgoing direction. at no point is (non-projected) solid angle used as a measure for the patch in question, yet many references and implementations consider probability density relative to this measure. in this post i will argue that using projected solid angle directly is more natural. read more → hybrid bidirectional path tracing 21 mar, 2011 i’d like to share my results from converting a cpu-only bidirectional path tracer into a cpu/gpu hybrid (cpu used for shading and sampling, gpu used for ray intersections). these results are a bit old… i posted them a while ago as a thread on ompf . i found out later that this thread had been cited in combinatorial bidirectional path-tracing for efficient hybrid cpu/gpu rendering , so let me summarise it here. read more → now you're lighting with portals 31 jan, 2011 i hate dome lights. you always waste a ton of rays that are occluded by geometry, and the situation gets even worse when lighting indoor scenes with exterior dome lights! so why not help your renderer out and place portals that, when hit, teleport to the dome light. then instead of sampling the whole skydome, we just sample the portals, and avoid sending rays where we know they will be occluded. as an example, here’s the sponza scene using an exterior (uniform) dome light, rendered using unidirectional path tracing with multiple importance sampling: read more → two-way path tracing 3 jan, 2011 this post is about a path tracing technique that sits between unidirectional path tracing and bidirectional path tracing. for want of a better name, let’s call this two-way path tracing . it’s defined as follows: trace eye rays, handle light source intersections and sample light sources explicitly trace light rays, handle sensor intersections and sample sensors explicitly when computing weights for multiple importance sampling, take both tracing methods into account so you can think of this technique as either: unidirectional path tracing in both directions at once bidirectional path tracing, but we only connect sub-paths if one of the sub-paths has one vertex so why is this interesting? because: like unidirectional path tracing, you only need to track a fixed amount of state, regardless of maximum path length. this is potentially nice for gpu implementations where you usually want to avoid hitting memory and have a large number of paths in flight. you can efficiently multiple importance sample between forward and reverse paths, so you can get reduced variance compared to unidirectional path tracing for some types of scenes (e.g. caustics). in this post i’d like to cover how to multiple importance sample between forward and reverse paths, and show some test images. read more → «« « 1 2 3 4 » »» back to top site by hugo , theme by enten/hy

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Domain name:
sjbrown.co.uk

Registrant:
Simon Brown

Registrant type:
UK Individual

Registrant's address:
The registrant is a non-trading individual who has opted to have their
address omitted from the WHOIS service.

Data validation:
Nominet was able to match the registrant's name and address against a 3rd party data source on 24-Jun-2016

Registrar:
123-Reg Limited t/a 123-reg [Tag = 123-REG]
URL: http://www.123-reg.co.uk

Relevant dates:
Registered on: 16-Jun-2001
Expiry date: 16-Jun-2019
Last updated: 22-May-2017

Registration status:
Registered until expiry date.

Name servers:
ns.123-reg.co.uk 212.67.202.2
ns2.123-reg.co.uk 62.138.132.21

WHOIS lookup made at 08:53:52 12-Jan-2018

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  ARGS sjbrown.co.uk

  PORT 43

  TYPE domain

OWNER

  ORGANIZATION Simon Brown

TYPE
UK Individual

ADDRESS
The registrant is a non-trading individual who has opted to have their
address omitted from the WHOIS service.
Data validation:
Nominet was able to match the registrant's name and address against a 3rd party data source on 24-Jun-2016

DOMAIN

  SPONSOR 123-Reg Limited t/a 123-reg [Tag = 123-REG]

  CREATED 2001-06-16

  CHANGED 2017-05-22

STATUS
Registered until expiry date.

NSERVER

  NS.123-REG.CO.UK 212.67.202.2

  NS2.123-REG.CO.UK 62.138.132.21

  NAME sjbrown.co.uk

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