important

important stuff

land impact 1.

Certain prims* with materials ( PBR, alpha mask, normal map, etc. ) can skyrocket land impact
most prims & linksets are best set to the | Convex Hull | physics shape, under the Features Tab of the Build Menu.

Additionally attempting to set a linkset to | None | will set all prims except the root to not have physics at all, which can lower LI even further.

*curved shapes are prone to have this happen ( Sphere, Torus, etc. or really any shape that has been tortured )

land impact 2.
~more detail~

Prims with the bare minimum texturing applied will have their Land Impact = prim count.

However changing the materials ( PBR, alpha mask, normal map, etc. ) will for whatever reason force those prims to use LI calculations similar to mesh,

and due to the incredibly complex Physics Shapes for some prims, you can run into crazy high land impact.

in Build Menu, click the More Info button > Weights of Selected >

Download : | varies per prim |
Physics : | varies a LOT per prim |
Server : | 0.5 |
Display : | - not relevant - |

the greatest value here will determine the LI. Physics weight varies based on object parameters & scale.

Using Convex Hull comes with some caveats for collision. Visually inspect your prims with the toggleable Physics Shape view* for prims that you wish to pass-through or reset to their original physics shape.*

Edit Linked will allow you to change individual prims Physics Shapes.

*on Firestorm it's a clickable eye next to Physics Shape Type.
*typically doorways, tunnels - things made with hollow.

land impact 3.
visual example

known quirks & bugs

potentially destructive.

Attachments need to be Re-Attached to save Edits made. This goes for everything, not just Prims.
Sometimes prims that z-fight will not be apparent until re-rezzed
Unlinking Larger Link Sets can cause flickering, or prevent the user from editing the newly unlinked objects
Tiny prims are likely to be missed when attempting to select them with Shift+Drag
Pasting Materials on medium/large Link Sets can cause intense lag and other weirdness.

inconvenient.

Parameters can be linked to others in not so obvious ways.
ex, skew & revolutions
There was a change to the normals of the hollow faces on Curved shapes around 4/12/2025, affecting previous prim builds.
Land impact shown in Build Menu can be slow to update even when the Physics Shape is changed.
Spheres are not given adequate LSL support.
Recently created Link Sets show inaccurate Link Order until re-rezzed

Page updated

Google Sites

Report abuse