[sldev] Sculpties: Vacuum-Forming, Skittering, Zone Linking

Adam Frisby adam at gwala.net
Fri Sep 28 11:33:15 PDT 2007


Or we could just get meshes.

Be a lot easier. ;)

Adam

Dale Mahalko wrote:

> On 9/28/07, *Argent Stonecutter* <secret.argent at gmail.com 
> <mailto:secret.argent at gmail.com>> wrote:
> 
>     On 28-Sep-2007, at 11:27, Dale Mahalko wrote:
>      > Tunnels and linked holes are technically impossible in a sculptie
> 
>     PRIM_SCULPT_TYPE_TORUS
> 
> But what if you need more than one hole, multiple interlinking holes, or 
> any number of holes? What if you're making a swiss-cheese sculptie? I 
> realize this rapidly becomes a discussion of topology and the limit of 
> how many hole configurations LL may offer in predefined prim types..
>  
>  
> What's really needed is a way to arbitrarily define holes (or at least 
> seams) through a sculptie mesh so that the mesh can be literally cut and 
> peeled apart into independent flexible sections that are then wrapped 
> and shaped as needed to form potentially independent meshes.
>  
> This could be done by defining a particular color as a special code for 
> "make seam here". Since sculpties don't use the alpha channel for 
> anything, seaming data can be stored in there.
>  
>  
> Conceptual diagram: Sculpties Store Seam Data in Alpha
>  
> http://img211.imageshack.us/my.php?image=sculptiestoresseamsinalit2.png
>  
> So if you need a hole through the sculptie you simply draw an 
> alpha-channel line across the color vertex image.The points directly 
> below the alpha-channel form one edge around the mouth of the seam while 
> the points directly to the right (or directly above/below, if a 
> horizontal seam on the RGB data) form the other edge around the mouth of 
> the seam. The adjoining triangles across the seam are dropped and not 
> rendered. To properly form a tunnel, two seams need to be cut and the 
> open ends of the seams go inside and pass through the interior of the 
> object. The open ends of both seams are aligned and overlap to form a 
> continuous tunnel.
>  
> Or if you want to just tear off a section of mesh from the sculptie, to 
> be used as a free-floating object always hovering in place nearby the 
> main sculptie, cut all the way around a large section of vertexes and 
> then fold the edges of that tiny patch together, so that the normals 
> all face outward to form a continuous shape. The square hole in the main 
> sculptie can just be pulled across and tucked shut to hide the cutout hole.
>  
> - Scalar Tardis aka Dale Mahalko
>  
> 
> 
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> 
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