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by ingenious
Thu May 08, 2014 5:42 pm
Forum: General Development
Topic: My Optix porting of SmallVCM (only PathTracer & BDPT)
Replies: 24
Views: 17405

Re: My Optix porting of SmallVCM (only PathTracer & BDPT)

This paper is also quite relevant to this discussion:

http://cgg.mff.cuni.cz/~jaroslav/papers ... /index.htm

It's first-authored by the main author of SmallVCM.
by ingenious
Mon Apr 28, 2014 5:15 pm
Forum: General Development
Topic: UPS vs VCM?
Replies: 9
Views: 5325

Re: UPS vs VCM?

* is there a big difference between VCM and UPS? "in other words which parts should I change to convert smallVCM to UPS" The answer is surprisingly simple: nothing ;) The actual algorithm you need to implement is the same for both methods. The VCM and UPS papers simply arrive at this algo...
by ingenious
Sat Apr 26, 2014 1:25 pm
Forum: Links & Papers
Topic: Joint Importance Sampling of Low-order Volumetric Scattering
Replies: 8
Views: 10200

Re: Joint Importance Sampling of Low-order Volumetric Scatte

Hi guo. We really need the MathJax plugin, indeed. I had to paste your questions in a LaTeX document in order to read them :) Thanks for reporting the errors in equations (42) and (46)! I re-checked them and indeed it seems you're right about both. The same error from (46) also appears in (50). I wi...
by ingenious
Thu Apr 17, 2014 3:04 pm
Forum: Visuals
Topic: Veach's room scene pimped
Replies: 5
Views: 9547

Re: Veach's room scene pimped

Indeed, the volume caustics are subtle but nice. Here's a visualization of length-4 paths only, where these caustics are more prominent. It'd be also cool to reproduce Veach's image pyramid with the contributions of the individual techniques.

Room_length4.png
Room_length4.png (839.28 KiB) Viewed 9461 times
by ingenious
Thu Apr 17, 2014 10:43 am
Forum: Visuals
Topic: Veach's room scene pimped
Replies: 5
Views: 9547

Re: Veach's room scene pimped

The image was rendered on the CPU using an algorithm I've been trying to publish unsuccessfully for some time (I suspect due to some prior work on this topic). I call it Overnight Rendering with Bidirectional Path Tracing ;) But actually the image looks pretty good already after 1 hour in my rendere...
by ingenious
Thu Apr 17, 2014 9:35 am
Forum: Visuals
Topic: Veach's room scene pimped
Replies: 5
Views: 9547

Veach's room scene pimped

Last night I played with my... ray tracer, and decided to give a shot at pimping Veach's famous room scene a bit. Here's the result:

Room.png
Room.png (851.87 KiB) Viewed 9547 times


And here's Veach's original:

Veach_room.png
Veach_room.png (374.81 KiB) Viewed 9547 times
by ingenious
Tue Apr 15, 2014 10:32 am
Forum: Scratchpad
Topic: Caustics causing trouble in London
Replies: 4
Views: 12241

Re: Caustics causing trouble in London

toshiya wrote:All architectural designers seriously need to use a rendering algorithm that can properly handle caustics!


Shameless self-promotion! :mrgreen:
by ingenious
Sun Apr 13, 2014 9:41 am
Forum: Scratchpad
Topic: Caustics causing trouble in London
Replies: 4
Views: 12241

Caustics causing trouble in London

A bit old, but awesome -- a curved reflective building in London casting a caustic on a street, heating the area to up to 93 degrees Celsius :D News report (video): http://www.theguardian.com/uk-news/video/2013/sep/03/london-walkie-talkie-skyscraper-video Melted car (pics): http://www.dailymail.co.u...
by ingenious
Sat Mar 22, 2014 9:47 pm
Forum: General Development
Topic: Efficient sampling of many lights
Replies: 22
Views: 19832

Re: Efficient sampling of many lights

Lightcuts, as presented in the original paper, builds the point lights and the light tree once, and proceeds to do the rest of the rendering process with those lights and with that tree. To use the die analogy again, it rolls the die once, and just uses that result. No matter how long it runs, it n...
by ingenious
Sat Mar 22, 2014 12:45 pm
Forum: General Development
Topic: Efficient sampling of many lights
Replies: 22
Views: 19832

Re: Efficient sampling of many lights

...Under that (incorrect) definition, the paper you reference above is, indeed, unbiased. But lightcuts as presented in the original paper still is not. You keep saying this, but I still don't know what your reasoning is. Googled a bit. Before ingenious yells at me I should point out this paper: ht...

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