Due to recent advances it’s quite possible to create builds, or modify your old builds and drastically reduce your land impact (prim count) score. This doesn’t require mesh, but it does require you change the physics shape of your prims from prim to Convex Hull and be warned, there are some gotchas with this, if you’re not using cube prims, then your land impact score could actually go up, so tread carefully. There’s also the issue of scripts, but we’ll come to that later.
So we start with my work in progress build:
This weighs in at 19 prims currently, I’ll lower that during this process. The build is 28 x 28 top floor and 26 x 26 ground floor. Already I’m able to make savings because Linden Lab now allow us to create larger prims natively in the viewer, all of this can be done inworld with the inworld tools.
In old money, this build would already have a prim count of 63 prims, so the fact that I can create it with just 19 is already a whopping saving, that 10 meter prim limit really did add to the prim counts, now that’s gone, whopping savings can be made right away, however as I said, I’ll lower the count.
So to start with I have my build at 19 prims with a physics shape of prim:
Now if I change the physics shape type in that dropdown, the linkset will be counted in the same fashion as mesh and as cubes are low cost, when they’re linked they basically half in land impact score, so for example two cube prims linked and set to convex hull will only have a land impact score of 1, rather than 2 … so I’ll demonstrate that right now:
And as you can instead of a land impact score of 19 I now have a land impact score of 19 …. wait wait wait! What’s all this about? Well the problem is the door, yes just one door script means you can’t make prim savings by changing your build to convex hull, but there is an answer, unlink the door from the linkset:
To do this you merely right click the linkset, tick the edit linked parts box, right click the door and make sure that’s what you’re clicking and then click unlink. Now everything is linked except for the door and now I do make savings on land impact:
So now my total build comes in at a land impact score of 10, 9 for the main build and 1 for the door, we can’t forget about the door. That means if you want to move it, you’ll have to select the main linkset and the door, otherwise the door will be left behind! However that’s really not that troublesome and if you want to sell your builds then you can utilise a utility such as CrystalShard Foo’s excellent rez-Foo which is designed for builds that have large linksets really but I’ve used it many times when I’ve added sculpted stairs to my builds. I tested this work in progress with Rez-Foo to see if there were any issues with the new physics shapes and Rez-Foo and it worked a treat.
So from 63 prims, down to 19 thanks to Linden Lab allowing us to use larger prims, and then down to 10, pretty good savings I’d say! As I said, there are some gotchas, this won’t work in all cases and could indeed increase the land impact (prim count) score if you’re using sculpts or curved/twisted prims, you have to be aware of the script limitations and convex hull isn’t suitable for hollowed out prims that you want people to be able to walk into, however if a hollowed out prim is part of your linkset, then set just that prim to physics shape prim and leave the rest as convex hull, you can make savings like that.
This is worth a try, but do tread carefully.