Search found 16 matches

by Paleos
Tue Apr 26, 2016 11:13 pm
Forum: General Development
Topic: A better way to sample a sphere (w.r.t. solid angle)
Replies: 16
Views: 12772

Re: A better way to sample a sphere (w.r.t. solid angle)

How would one go about importance sampling the sphere with respect to projected solid angle instead of just the solid angle,
in order to importance sample the product of both the lambertian brdf and a spherical light source?
by Paleos
Wed Sep 02, 2015 11:16 pm
Forum: General Development
Topic: Combining Path Tracing with MLT
Replies: 2
Views: 2778

Combining Path Tracing with MLT

The main purpose of using Metropolis Light Transport is for improving efficiency on the paths that are unlikely to be found by chance, such as sharp caustics or light coming in through a crack in a almost closed door. However it is inferior to ordinary path tracing techniques when the path is highly...
by Paleos
Wed Jun 17, 2015 11:14 pm
Forum: Links & Papers
Topic: Probabilistic Connections for Bidirectional Path Tracing
Replies: 0
Views: 8415

Probabilistic Connections for Bidirectional Path Tracing

Here is a paper on improving bidirectional path tracing by reusing light sub-paths across eye sub-paths: Probabilistic Connections for Bidirectional Path Tracing abstract: Bidirectional path tracing (BDPT) with Multiple Importance Sampling is one of the most versatile unbiased ren- dering algorithms...
by Paleos
Sun May 31, 2015 4:34 am
Forum: Links & Papers
Topic: Improved half vector space light transport and Manifold NEE
Replies: 0
Views: 8413

Improved half vector space light transport and Manifold NEE

I came across two papers on the website for Johannes Hanika, that are promising Improved half vector space light transport Abstract : "In this paper, we present improvements to half vector space light transport (HSLT) [KHD14], which make this approach more practical, robust for difficult input ...
by Paleos
Tue May 12, 2015 1:03 am
Forum: General Development
Topic: Generalizing the Golden Ratio Sequence to Higher Dimensions
Replies: 4
Views: 3018

Re: Generalizing the Golden Ratio Sequence to Higher Dimensi

What I have figured out that I could do is take the Golden point set as described in the original paper and and then assume that a total of, for instance 2^64 will be generated, and then choose the index within the period with the van der corput sequence. The problem is however is given the how seco...
by Paleos
Tue Apr 14, 2015 9:06 pm
Forum: Visuals
Topic: Psychopath: a microgeometry path tracer
Replies: 16
Views: 17841

Re: Psychopath: a microgeometry path tracer

A way to get around the MLT limitation of your architecture is to use a multiple proposal metropolis sampler such as described in the first paper of my Useful Markov Chain Monte Carlo Papers to apply to Graphics post.
by Paleos
Tue Apr 14, 2015 8:15 pm
Forum: General Development
Topic: Way to Combine HLST and MMLT.
Replies: 0
Views: 7619

Way to Combine HLST and MMLT.

The idea is, as opposed to combining the Half Vector Space perturbation with Veach's original perturbations, instead using the Multiplexed Metropolis Light Transport(MMLT) mutations in order to more robustly handle glossy corners and the like, while reserving the costly Half Vector Space perturbatio...
by Paleos
Mon Apr 13, 2015 11:48 pm
Forum: Links & Papers
Topic: Papers for addressing MLT limitations
Replies: 0
Views: 10479

Papers for addressing MLT limitations

Here are some papers for addressing limitations of the Metropolis Light Transport algorithm. Flickering in animations The remedy to this limitation is to mutate paths through both space and time, not just space. Physically-based Animation Rendering with Markov Chain Monte Carlo Poor SIMD efficiency ...
by Paleos
Mon Apr 13, 2015 9:06 pm
Forum: General Development
Topic: Unbiased way to independently find SDS paths
Replies: 0
Views: 7725

Unbiased way to independently find SDS paths

The idea i am presenting is to use some form of vertex merging to provide an initial guess which is then iteratively corrected into an unbiased path using manifold( Manifold Exploration ) or half vector space perturbations( The Natural-Constraint Representation of the Path Space for Efficient Light ...
by Paleos
Sun Mar 29, 2015 5:34 pm
Forum: Links & Papers
Topic: Useful Markov Chain Monte Carlo Papers to apply to Graphics
Replies: 4
Views: 5640

Re: Useful Markov Chain Monte Carlo Papers to apply to Graph

The idea of optimizing for the ideal acceptance ratio is the fundamental principle of Adaptive Markov Chain Monte Carlo methods.

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