I've continued to work with POV-Ray's blob object over the past month 
plus, trying to understand what can be accomplished. I suppose much of I 
am figuring out is known to those at POV-Ray longer than me, but if new 
to me as a long time user, perhaps new news to others too. All three of 
the images I entered in the recent  TC-RTC abstract competition are blob 
based for those who might be interested:

http://www.tc-rtc.co.uk/image/upload//pokorny/pw-1453992884-MeetingBlob.jpg

http://www.tc-rtc.co.uk/image/upload//pokorny/pw-1455199849-blobRGB.jpg

http://www.tc-rtc.co.uk/image/upload//pokorny/pw-1453648992-SevenHoles.jpg

In part for the blobRGB image above, I developed a BlobBlur() macro I've 
posted in povray.binaries.scene-files at:

http://news.povray.org/povray.binaries.scene-files/message/%3C56ca6857%40news.povray.org%3E/#%3C56ca6857%40news.povray.org%3E

with the thought others might find it useful. It is an attempt to 
encapsulate a little of the image processing which can be accomplished 
via blobs. The attached demo image, with three rows of three sub-images, 
shows in left to right, top to bottom order : No blur, gaussian blur by 
offset, gaussian blur by convolution kernel, upward only directional 
blur, blur with >1 pixel spread, image merging, localized blur, 
localized non-blur and a blur-merge effect I called DirtyOldSlide.

As with other POV-Ray pattern/texture averaging methods, performance 
slows significantly as the number of textures averaged via blob 
components grows.

Bill P.

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