September 2008


ok, its a long time. so some thoughts on implicit surfaces and their topology. so why do we talk about it in first place, its becouse of its ugly topology. metaballs are so cool, but hardly usable in animations and in other fields cos of irregular and ever chaging mesh topology, so what do we do? lets think.

first, a description of implicit surface as i understand it.

2.2.3 Implicit surfaces (Bloomenthal 1987)

Implicit surfaces are also known as “Metaballs”, “Blobbies” or “Soft objects”.

Implicit surface is a technique first introduced by Jim Blinn in 1980. The idea is to have control objects, which determine the resulting surface. Each control object generates a sphere around itself. When two or more controller objects are close together, the resulting surface will “melt” together. So instead of two spheres one will have two spheres which are connected and form a “blobby” single surface shape. How much the resulting surfaces blob together is a result of distances from controlling objects and of weights of these control objects. (Maestri. 1999 43-44)

so i had few ideas on the matter. pls look at a picture and tell me what u think.

ok. now as far as i understand the poligonization of such mathematical substance :) as metaball, it works like this (and pls correct me if i am wrong) the algorithm “checks” certain points in worldspace to see if that point is in or outside of this mathematical descriptio0n of metaballsurface. so basically, user determines “resolution” or level of detail he or she wants, and based on that, algorithm generates planes, to see where are boundaroes of this object in that particular plane. and planes are generated in x, y, and z. so pls look at picture beneath. so what i thought of is, why user is not able to determine how these planes are distributed and aligned? why dont we have such simple control as in uv ordinates, u know we would choose box, cilinder, sphere just like in uv layout (imagine box uv layout as a traditional plane distribution for imlicitsurfaces).

so people who have read, and understood, some of papers about implicit surfaces, including old john blinns texts, tell me do i bulshit or that could be a very small step towards better topology?

and some links to read more: here

and as usual link to my other website here

So first of all to these for whom erotics is a sensitive topic (or you are too young to watch such content, by decision of you government)- please ignore this post and look around all other posts in my blog. i promice = all other posts are about 3d and trees only.

And for others:

Have you ever wondered how a typical buss ride looks in this eastern northern European country called Lithuania? Now you have a chance to see it for your self. It could be a bit slow, but usually all good things start slow, so be patient, and enjoy:

 

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