Prim-to-Mesh Guide. v1.0

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This guide is intended for those interested in making mesh from prims,
framed mainly for anyone newer to Blender and/or uploading mesh.

Some sections will include a collapsible box that contains the same steps, just with additional comments or info.

if there are any problems, please let me know.↗

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last modified. 2026-08-12
by heatherhawnwritten while using Blender 3.6 and Firestorm,
dialogs/menus may differ between versions and viewers.

prerequisites;

▸Blender, any version before 5.0
↳ or 5.0+ with a collada import/export addon
▸objects that you are the sole creator of
▸account capable of uploading mesh | Uploading a mesh model↗

◆ GENERALLY speaking, objects that are heavy on topology & larger in scale will be less efficient to convert for land impact purposes.
| 64 meter wide prim sphere → 1 land impact.
| the same sphere but as a mesh → 15.5 land impact.

if you have a large build, consider breaking it down into multiple mesh objects -
a house could have it's exterior shell as one mesh, and smaller detailed areas as their own meshes, etc.

Table of Contents

Part 1. Export as Mesh

Part 2. Mesh Corrections

Part 3. Normals | optional

Part 4. Lazy Optimizations | optional

Part 5. Texturing

Part 6. Removing Interior Faces | optional

Part 7. Export Mesh

Part 8. Upload

changelogs

2026-08-12 ▸wording and visual clarity adjusted2026-07-23 ▸prim-to-mesh guide created

Part 1. Export as Mesh

in Second Life,
Right Click Linkset → Save As → Collada
🗹 Save Textures ( optional )
🗹 Consolidate textures
🗹 Skip transparent
🗹 Apply texture params
🗹 Single UV Map

in detail Part 1. Export as Mesh

in Second Life,
Right Click Linkset → Save As → Collada
▸currently displayed object LOD will be applied when exporting prims.
▸you cannot export prims created by another even if you own them full-perm.

🗹 Save Textures
entirely optional - this just includes textures from the prims with the collada file. you can't save other creator's full-perm textures from this export menu, but they can be saved from your inventory.

🗹 Consolidate textures
I think this option merges faces that share textures & tint into one material?

🗹 Skip transparent
deletes fully transparent faces.
it's worth doing some pre-export clean-up of your prims by setting unnecessary faces transparent.

🗹 Apply texture params
the scale, offset, & rotation will be applied/baked into the UV.

🗹 Single UV Map
without this every prim is given a unique UV map within Blender.
not entirely sure what the use cases for that are in regards to prims, so keep it toggled on !!!

Part 2. Mesh Corrections

In Blender,
File → Import → Dae ( COLLADA )

Select all [ A ]
and enter Edit Mode. [ Ctrl ] + [ Tab ]

Merge by Distance [ M ] → By Distance
after clicking that, look to the bottom left of the Viewport.
a drop-down menu will appear with adjustable parameters for the action.
☑ Sharp Edges

return to Object Mode. [ Ctrl ] + [ Tab ]

select any Flexi Prims and Reset Scale. [ Alt ] + [ S ]

Select All [ A ] remaining prims, and Apply Transforms [ Ctrl ] + [ A ]

Join the prims as one object. [ Ctrl ] + [ J ]

in detail Part 2. Mesh Corrections

In Blender,
File → Import → Dae ( COLLADA )

Select all [ A ]
and enter Edit Mode. [ Ctrl ] + [ Tab ]

Merge by Distance [ M ] → By Distance
after clicking that, look to the bottom left of the Viewport.
a drop-down menu will appear with adjustable parameters for the action.
☑ Sharp Edges
We merge by distance because Imported prims are non-manifold along their UV seams, which can cause problems if you want to make.
☑ Sharp Edges keeps any hard-surface prim's normals mostly intact. Sometimes causes problems with shading on certain prims but that can be fixed in the next part.

return to Object Mode. [ Ctrl ] + [ Tab ]

select any Flexi Prims and Reset Scale. [ Alt ] + [ S ]
Flexi prims require their scale reset to be their original SL size.

Select All [ A ] remaining prims, and Apply Transforms [ Ctrl ] + [ A ]
Non-flexi prims require their scale applied to have their normals remain mostly intact when joined into one.

Join the prims as one object. [ Ctrl ] + [ J ]

Part 3. Normals | optional

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Part 3 is optional if your mesh is visually on par with the original prims, excluding any texturing.

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3D Basics - What are Normals?↗

if you notice inaccurate shading of your prims,
return to Edit Mode. [ Ctrl ] + [ Tab ]

mouse over and select the problem 'prims' in your joined object with Select Linked. [ L ]

open the Normals menu [ Alt ] + [ N ] and click Reset Vectors.

if that still hasn't fixed it, you can also try clicking Average → Face Area in the Normals menu.

if you have an inaccurately sharpened edge,
toggle Edge Select Mode [ 2 ]
sharp edges are shown as blue in Edit Mode.

Select an Edge [ LMB ]
[ RMB ] → Clear Sharp

or if you have longer lengths of sharpened edges, Select an Edge [ LMB ] on one end of the 'line', then [ Ctrl ] + [ LMB ] the other.
[ RMB ] → Clear Sharp

or if you have an edge you wish to be sharp,
toggle Edge Select Mode [ 2 ]
Select an Edge [ LMB ]
[ RMB ] → Mark Sharp

in detail Part 3. Normals

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Part 3 is optional if your mesh is visually on par with the original prims, excluding any texturing.

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Besides maybe using a Data Transfer modifier, which might be more hassle than it's worth depending on how many prims you have, there isn't really a one and done method for getting 100% accurate normals for ALL prims.

if you notice inaccurate shading of your prims,
return to Edit Mode. [ Ctrl ] + [ Tab ]

mouse over and select the problem 'prims' in your joined object with Select Linked. [ L ]
Select Linked lets you select areas of an object that are directly connected or fit a certain criteria. Blender manual↗

open the Normals menu [ Alt ] + [ N ] and click Reset Vectors.
usually the best option for hard-surface areas.

if that still hasn't fixed it, you can also try clicking Average → Face Area in the Normals menu.
usually OK for organic areas.

if you have an inaccurately sharpened edge,
toggle Edge Select Mode [ 2 ]
sharp edges are shown as blue in Edit Mode.

Select an Edge [ LMB ]
[ RMB ] → Clear Sharp

or for longer lengths of sharpened edges, Select an Edge [ LMB ] on one end of the 'line', then [ Ctrl ] + [ LMB ] the other.
Holding Ctrl selects the shortest path between the two clicked points.
[ RMB ] → Clear Sharp

if you have an edge you wish to be sharpened,
toggle Edge Select Mode [ 2 ]
Select an Edge [ LMB ]
[ RMB ] → Mark Sharp

Part 4. Lazy Optimizations | optional

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Part 4 is entirely optional.
your results from this will vary.

this part uses a planar decimate modifier to shave off some faces. it can potentially mess with prims, but because it's a modifier, it will be non-destructive.

( non-destructive meaning you can turn off or change the modifiers after )

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first, turn on the mesh statistics overlay.
Top Right of 3D Viewport > Viewport Overlays v
Guides
☑ Statistics
mesh objects are limited to 65536 vertices per LOD.↗

you can also turn on Wireframe view if you want to watch the modifiers take effect.
the four sphere icons at the Top Right of 3D Viewport are the different shading methods.

Wireframe, Solid, Material Preview, and Render Preview.
each method has a unique dropdown menu with adjustable settings worth looking at.

in Object Mode. [ Ctrl ] + [ Tab ]

Duplicate [ Shift ] + [ D ] your mesh.

with the duplicate still selected,
look to the navigation bar to the right of the 3D Viewport.

Click the Blue Wrench Icon to open the Modifiers Tab.

Click Add Modifier, and add these three.
( the three in the ordered list. )

1. Generate → Decimate
Collapse, Un-Subdivide, | Planar |
Angle Limit : 5
Delimit : Sharp & UVs

2. Generate → Triangulate
I like to add a triangulate modifier here to lazily deal with n-gons.

3. Modify* → Data Transfer
*recent blender versions will have Data Transfer in the 'Edit' dropdown.
Source : | the non-modifier mesh |
> ☐ Vertex Data
> ☐ Edge Data
˅ ☑ Face Corner Data
| Custom Normals |
Mapping | Nearest Corner and Best Matching Face Normal |
> ☐ Face Data
data transferring the normals can sometimes cause issues, but as stated earlier, modifiers are non-destructive and can be adjusted or removed.

you can Hide [ H ] the non-modifier mesh now.

Part 5. Texturing

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Part 5 is very light on details.
please read the disclaimers.

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disclaimers;

▸ only diffuse texture mappings are accounted for when exporting prims. ( the scale, offset, and rotation of a texture in SL. )

▸exported prims come with material slots for every unique texture and/or tint. when uploaded to SL, those material slots = faces in SL. mesh objects are limited to 8 faces.↗

▸faces that use the same alpha masked texture ( and tint ) will be set to be the same material, even if they had different masking values.

look to the navigation bar to the right of the 3D Viewport.

Click the Red Sphere Icon to open the Material Tab.
if your object has 8 or less materials, skip the rest of this part.

Part 5.1. | dependent

technically you don't need to do anything with the materials since SL will let you upload whatever you want so long as it doesn't reach the limits, and even then; the mesh uploader will accommodate you by dividing your one object into multiple objects instead.

but that's a bad mindset, optimizing your objects is good!

sorry about this part being light on details, it's a bit of a rabbit hole and I don't have solutions for every situation yet.

here are some vague directions towards methods to reducing material count / other stuff.

if you have an excessive amount of materials, consider using Material Combiner↗, or something similar; search for Texture Atlas or Trim Sheet addons.
my own experience with this Material Combiner add-on has been mixed but that could just be user error.

one important restriction that I think is innate to the .dae file, if a face had a texture AND a tint applied, only the texture will be included in Blender. if you want to use texture atlas addons like this one you will have to manually reapply tint to those faces.

if you have topologically dense & extremely flat prims, consider converting them into textured planes.
still experimenting with this, but I recommend taking near-orthographic photos in SL of the prims you want as planes.
I use Bijocam↗ for my photo setups.

Part 6. Removing Interior Faces | optional

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Part 6 is optional at your discretion.
if you are new to Blender, probably skip this.

my method is very hacky, and is intended for dense organic objects with lots of faces hidden inside.

we will be manually selecting only the faces that are visible from the outside, turn that selection into a vertex group, then plug that group into a mask modifier.

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Top Right of 3D Viewport > Viewport Overlays
Guides
☑ Statistics
mesh objects are limited to 65536 vertices per LOD.↗

in Edit Mode. [ Ctrl ] + [ Tab ]
enter Face Select Mode. [ 3 ]
if you have any faces selected, Clear your Selection [ Alt ] + [ A ]

Cycle Selector [ W ] until you have the Circle Selector

at the top left of the 3D viewport, increase the selector's radius.
from here, Select Faces [ LMB ] only from an exterior POV.
move your view to another angle, and Select More [ Shift ] + [ LMB ]
repeat until you have selected all of the exterior faces.

in Object Mode. [ Ctrl ] + [ Tab ]
modifiers by default are hidden when in Edit Mode.

look to the navigation bar to the right of the 3D Viewport.

Click the Green Upside-down Triangle Icon to open the Data Tab.

˅ Vertex Groups
add Vertex Group [ with the + button ]
rename to 'Exterior'

with your exterior faces still selected, click Assign.

look to the navigation bar to the right of the 3D Viewport.

Click the Blue Wrench Icon to open the Modifiers Tab.

Click Add Modifier

Generate → Mask
| Vertex Group |, Armature
Vertex Group : | Exterior |
☑ Smooth
Threshold : 0.0

Part 7. Export Mesh

save your .blend file if you haven't already!

in Object Mode. [ Ctrl ] + [ Tab ]

select your object.

File → Export → Collada (.dae)

under the Main tab
☑ Selection Only
exports only the objects selected in object mode

under the Geom tab
Apply Modifiers ☑ | Viewport |

everything else can be default.
if you modified other settings, right click them and click Reset to Default

Part 8. Upload

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quick note!

there's the Beta Grid↗ that let's you upload mesh at no cost, for testing purposes.

or if you are on Firestorm, there is a 'Local Mesh' menu for previewing meshes locally on the regular SL grid.

Top Menu Bar
Build → Local Mesh...

your mileage may vary; Local Mesh has it's own quirks.

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optional read that covers basically everything not covered here.
Uploading a mesh model↗

in Second Life,
Top Menu Bar
Build → Upload → Mesh Model...

Level of Detail Tab

High → Load from File | Your Object |
Medium → Generate - Auto, Reliable, Sloppy
Low → Generate - Auto, Reliable, Sloppy
Lowest → Generate - Auto, Reliable, Sloppy

Physics Tab
Pick a physics model → | Cube | or | Bounding Box |
cube / bounding box are the lowest physics costing options here. certain objects you may want to look into having a more precise shape.

back to the Level of Detail Tab
Calculate Weights & Fees.

Land Impact is determined by the greatest value out of Download, Physics, and Server.

▸Download | depends on a variety of things. object scale, mesh density, amount of materials, complexity of LODs, etc.
▸Physics | increases with more complex Physics Shapes
▸Server | locked to 0.5 for un-scripted objects.

if satisfied with the resulting mesh and LI, click Upload.

Congratulations! You have converted prims into mesh, yipee!

textures can be pasted from the original prims onto the mesh version, but the texture mappings ( scale, offset, and rotation ) will have to be returned to default values.

mesh objects can be scaled more freely than prim linksets. test it out!

any problems, please let me know.↗
( you can also just send me a notecard in-game )

also, please don't use this guide when making meshes from scratch!
these steps were just what I came up with for converting primitives in a beginner friendly way.

in detail Part 8. Upload

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quick note!

there's the Beta Grid↗ that let's you upload mesh at no cost, for testing purposes.

or if you are on Firestorm, there is a 'Local Mesh' menu for previewing meshes locally on the regular SL grid.

Top Menu Bar
Build → Local Mesh...

your mileage may vary; Local Mesh has it's own quirks.

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optional read that covers basically everything not covered here.
Uploading a mesh model↗

in Second Life,
Top Menu Bar
Build → Upload → Mesh Model...

Level of Detail Tab
mesh models use four models to progressively lower the Level of Detail based on the viewers distance from the mesh. the radii in which these LODs are displayed scale with the object's scale.

creating LODs properly is beyond the scope of this guide.
we will be generating them via SL's uploader here. but~ SL's generated LODs can be ugly!

( another thing you can try is to repeat part 4 of this guide but increase the Planar Angle Limit for the Medium/Low LODs. )

High → Load from File | Your Object |
Medium → Generate - Auto, Reliable, Sloppy
Low → Generate - Auto, Reliable, Sloppy
Lowest → Generate - Auto, Reliable, Sloppy

play with the generator types and triangle counts. the Low/Lowest LODs can contribute a lot to download weight.
bottom right corner of the LOD tab you can change which LOD you are currently previewing.

Physics Tab
Pick a physics model → | Cube | or | Bounding Box |
cube / bounding box are the lowest physics cost options here. certain objects you may want to look into having a more precise shape.

other tabs in the mesh upload menu are worth looking at if you're interested. not entirely relevant for this guide though.

back to the Level of Detail Tab
Calculate Weights & Fees.
you will now see the overall land impact cost of your object, and the cost for uploading.

Land Impact is determined by the greatest value out of Download, Physics, and Server.

if your server cost is higher you may be uploading multiple mesh objects as a link set - this will happen if your object had more than 8 materials, or exceeded some other limit.

if satisfied with the resulting mesh and LI, click Upload.

Congratulations! You have converted prims into mesh, yipee!

textures can be pasted from the original prims onto the mesh version, but the texture mappings ( scale, offset, and rotation ) will have to be returned to default values.

mesh objects can be scaled more freely than prim linksets. test it out!

any problems, please let me know.↗
( you can also just send me a notecard in-game )

also, please don't use this guide when making meshes from scratch!
these steps were just what I came up with for converting primitives in a beginner friendly way.