Yamyam: 1版をインポートしました

2018-06-28T17:51:13Z

1版をインポートしました

2007年3月22日 (木) 21:42にwiki>Joeedhによる

2007-03-22T21:42:30Z

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Joseph Eagar

joeedh@gmail.com

=Proposal to Add Deep Shadow Maps to Blender=

==Introduction==

Deep shadow maps is the technique of creating filtered shadow buffers with color and transparency information. They allow much more realistic shadows, including the ability to actually mipmap a shadow buffer, a very important feature for larger shadow buffers, and also the ability to create motion-blurred shadow buffers.

Because of their ability to store transparency information, Deep Shadow Maps are also well-suited for rendering shadows of volumetric objects, such as clouds or smoke.

Since by their nature, Deep Shadow Maps consume a great deal of memory, a caching/compression scheme will be implemented to conserve RAM.

The caching scheme for deep shadow maps will be extended to image buffers, if time permits.

==User Impact==

Users will be beneficially impacted by Deep Shadow Maps. Transparent/colored shadows will no longer be a ray tracing-only option. Hair shadows will render much more realistically.

==Deliverables/Schedule==

* Create a simple Deep Shadow Map implementation, with transparent/colored shadows.
* Implement a compressed cache scheme to conserve RAM.
* Implement mipmapping for deep shadow maps.
* Implement motion blurring for deep shadow maps.
* Extend cache system to image buffers.
* If time permits, write volumetric system for rendering halo shadows.

==Details==

Deep shadow maps are, at their most basic form, an abuffer with slightly different oversampling techniques then used in normal rendering.

"Abuffers" are simple zbuffer rasterizers that store multiple Z-samples per pixel, one for each transparent face encountered. In the case of deep shadow maps, each pixel inside the map stores alpha and color for every Z-sample visible from the light source

Deep shadow maps can be filtered in a way similar to anti-aliasing. They can be mipmapped, allowing for more accurate, faster shadows during rendering. Since they support transparency, deep shadow maps can also be rendered with motion blur, allowing for properly motion-blurred shadows.

The disadvantage of deep shadow maps is their RAM consumption; because they have to store so much data, they take a great deal of RAM. To compensate for this, a tiling caching system will be implemented. This system will swap shadow map tiles out to disk as needed to keep RAM consumption below a user-defined limit.

==Bio==

I am a 20 year old student, attending Northern Arizona University in Arizona, USA. I have experience working with Blender's codebase, including the render code.

I've been coding in C for 5 years, and I've been working with Blender's code for the past 3. I've coded a ray tracing system, a scanline renderer, a fairly complete GUI library, and a (incomplete) DAG node-based audio editor system.

In addition to C, I'm also proficient in C++ (5 years), Python (4 years), Visual Basic 6.0, with lesser experience in PHP and Perl.

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Yamyam: 1版 をインポートしました

2007年3月22日 (木) 21:42にwiki>Joeedhによる

Yamyam: 1版をインポートしました