Image based lighting test


マイレンダラーもようやく実写合成？に対応しました。
I have added the image based lighting technique to my renderer. The light probe image used with is taken from the well-known page, http://www.debevec.org/Probes/. You may see the sky reflecting on the surface of the sphere. As for the quality, this image used 2,000 rays for each pixel. Though, there still remains some noise especially on the shiny sphere. Also you see some aliases on the background. But I would appriciate this for now.

Why not for cloth?

http://psgraphics.blogspot.com/2007/05/my-top-utility-papers.html
Prof. Shirley mentioned in his blog that his "An Anisotropic Phong BRDF Model", JGT00 is not good for cloth.
Does anyone know what he means by that?
Is that an issue in expression or on implementation?


Shirley先生の方法は、どうして布には適さないのか？表現上の問題、それとも実装上の問題？

Glossy reflection test


This weekend, I was traveling by trains, with my notebook PC. While on the trains, I was writing and testing a new shading function for my renderer. It gives the Phong reflection model to be used on any surfaces.
The idea I came up with last week works well. But sometimes it goes slow down on some surface configurations. I'll look into what happens there later.
The scene is arranged with two LEGO men and a porche. These models are borrowed from a sample scene of Indigo renderer.
You might see glossy reflections on the surfaces of both the red body and the wheel covers.

Glossy effects are comming

３月末からGlossy effectsの実装方法を考え始めて２ヶ月…
インポータンスサンプリングの実装方法で悩んでいたが、今日少しひらめいた。
某氏に「拘り過ぎ」と言われていたのだが、なんだか出来そうな感じだ。
今週末は久しぶりにコーディングしてみようと思う。

I'll try coding glossy effects this weekend. I got an idea today.

Poisson Image Editing


http://research.microsoft.com/vision/cambridge/i3l/blender.htm
前回の日記に関連して、SIGGRAPH2003のPoisson Image Editingを試作した。
継ぎ目が目立たないように2枚の絵を合成してます。
やってることは、引いて、ぼかして、足しただけ。
真ん中がその結果で、目の部分だけ取り替えてみた。
左は有名だけど、右の絵は知らないな。


Yesterday I was spending time at Mcdonalds and writing a program.
This picture shows a result of what I've done.
The middle female is synthesized using Poisson seamless cloning.
This time, I tried using WPF/XAML to implement the program.
I found that Microsoft Expression Blend helps me make the UIs easily.
Maybe I would say goodby to WinForms.

A faster solver for Poisson equation

http://agarwala.org/efficient_gdc/
結果を見ると、去年のSzeliskiのわかりにくい論文は何だったの？って感じ。
quadtreeのモザイクを見てなんとなく分かった気になれたので、とりあえず放置。
OK for now. Just leave it.