need help with mesh and normal prims

[Sheena Foxdale]

heres my issue....my mesh object is li 19 prims....my build which is normal prim that i want to attach my mesh object is 147...when i link the two together the prim counts go into the thousands... what am I doing worng??

[Kwakkelde Kwak]

You're not doing anything wrong.

Normal prims, whether they are simple cubes or hollow tori (or a sculpty), are weighted at 1 prim = 1 landimpact.

The landimpact of a mesh object is based on the impact it will have on the SL servers and end user's systems. These impacts are split into 3 groups: download, physics and server. The landimpact is the highest of these 3 values.

So far so good, but when you link a normal prim (or a sculpty) to a mesh object, the normal prim will have a landimpact based on the "mesh rules".

You can see what impact your normal prims will have by editing them (before linking), then selecting "more info" from the menu (object tab I think). If the download weight is very high, there's not a lot you can do but rebuild your item. Chances however are the physics weight is very high. You can select the individual prims and set the physics shape to either "convex hull" or "none" (features tab). Obviously by setting the physics shape to "none", you can no longer walk into the object, but it also means the physics weight will be 0. You can't set the physics shape of the main prim (yellow in the linkset) to "none".

PS.. V1 based viewers like Phoenix do not have the "more info"  button as far as I know.

[Sheena Foxdale]

Sighs so bottem line I can not join a mega prim to a mesh object even if it is not a sculpt treid it already...even set the mega to phantom and still a no go...sighs and slams head against the wall...

[Kwakkelde Kwak]

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Sheena Foxdale wrote:

...even set the mega to phantom and still a no go...

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Don't set it to phantom, set the physics type to "none" instead, that has pretty much the same effect but leaves you with zero physics cost. Joining normal prims and meshes can have unexpected results, but in many cases it will be a pleasant surprise.

What you didn't post yet is if it is indeed the physics weight that makes the landimpact so high.

[SuperGirl1970 Carver]

so do you mean that it is the best if we don't upload any physics at all?

[Kwakkelde Kwak]

It's better than setting the object phantom in most cases.

If you need something to bump into, obviously you need a physics model.

[Drongle McMahon]

You can't avoid having a physics shape in the mesh asset, If you don't give it one, the uploader still creates a default convex hull from thr low LOD visible mesh. That can sometimes still have a high physics weight, If you set the physics shape type inworld to "None", that lets the physics engine ignore the object completely, whatever its physics shape, and reduces the physics weight to zero. However, you can't set the physics shape type of an unlinked object, or the root of a linkset, to "None". So to use this type the object has to be linked to at least one other, which will still have a physics weight. If the other is a (tiny invisible) undistorted cube prim, it will have physics weight of only 0.1.