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<转载>Vray抗锯齿详解  

2012-07-17 11:55:25|  分类: CG |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |
http://www.spot3d.com/vray/help/150SP1/examples_image_sampler.htm
这是一份官方维基
Example 8: Antialiasing filters

Here is an example briefly demonstrating the effect of different antialiasing filters on the final result.

 

Note that rendering with a paricular filter is not the same as rendering without a filter and then blurring the image in a post-processing program like Adobe Photoshop. Filters are applied on a sub-pixel level, over the individual sub-pixel samples. Therefore, applying the filter at render time produces a much more accurate and subtle result than applying it as a post effect. V-Ray can use all standard 3ds Max filters (with the exception of the Plate match filter) and produces similar results to the scanline renderer.

 

The Adaptive image sampler was used for the images below, with Min/Max rate of -1/3 and the Rand optionon.

 

FilterImageZoomed-in imageComments
Filtering is off转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosApplies an internal 1x1 pixel box filter
Area filter, size 1.5 (default setting)转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosSlightly blurrs the image, visually more pleasing than the box filter.
Area filter, size 4.0转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosMore blurring
Blend filter转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosCombination of a sharp and a soft filter, kind of dreamy effect
Catmull-Rom转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosEdge-enhancing filter, often used for architectural visualizations. Note that edge enhancing can produce "moire" effects on detailed geometry.
Mitchell-Netravali转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosAllows control between edge-enhancement and blurring
MItchell-Netravali, ringing=1.5转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosStrong edge-enhancement.
Mitchell-Netravali, ringing=2.0转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosEven more edge enhancement; kind of cartoon-style effect
Soften转载Vray抗锯齿详解 - Antonieo - Antonieos转载Vray抗锯齿详解 - Antonieo - AntonieosGaussian blur



Example 9: Antialiasing filters and moire effects

This example demonstrates the effect antialiasing filters have on moire effects in your images. Sharpening filters (Mitchell-Netralavli, Catmull-Rom) may enhance moire effects, even if your image sampling rate is very high. Blurring filters (Area, Quadratic, Cubic) reduce moire effects.

 

Note that moire effects are not necessarily a result of poor image sampling. In general, moire effects appear simply because the image is discretized into square pixels. As such, they are inherent to digital images. The effect can be reduced through the usage of different antialiasing filters, but is not completely avoidable.

 

The scene is very simple: a sphere with a very fine checker map applied, texture filtering is off. The images were rendered with a very high sampling rate (15 subdivs, or 225 rays/pixel). This is enough to produce quite an accurate approximation to the pixel values. Note that the image looks quite different depending on the filter:

 


转载Vray抗锯齿详解 - Antonieo - Antonieos

No filter

转载Vray抗锯齿详解 - Antonieo - Antonieos

Area filter, size=1.5

转载Vray抗锯齿详解 - Antonieo - Antonieos

Area filter, size=4.0

转载Vray抗锯齿详解 - Antonieo - Antonieos

Quadratic filter

转载Vray抗锯齿详解 - Antonieo - Antonieos

Sharp quadratic filter

转载Vray抗锯齿详解 - Antonieo - Antonieos

Cubic filter

转载Vray抗锯齿详解 - Antonieo - Antonieos

Video filter

转载Vray抗锯齿详解 - Antonieo - Antonieos

Soften filter,size=6.0

转载Vray抗锯齿详解 - Antonieo - Antonieos

Cook variable, size=2.5

转载Vray抗锯齿详解 - Antonieo - Antonieos

Blend, size=8.0, blend=0.3

转载Vray抗锯齿详解 - Antonieo - Antonieos

Blackman

转载Vray抗锯齿详解 - Antonieo - Antonieos

Mitchell-Netravali, blur=0.333, ringing=0.333

转载Vray抗锯齿详解 - Antonieo - Antonieos

Catmull-Rom
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