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I am proud to announce my release of OarConv Reimagined. This program will allow you to upload any mesh, rigged mesh, or not up to around 1 gigs about 20 files or so at once using an oar file! It auto chunks large meshes automatically. The items in the picture were over 2 million verts. It makes a sane physics map for you also . So despite the high verts, well the physics load is a lot lower than what you get with the viewer. It also will let you list all your oar contents in a text file...and well import it into blender with all the textures and placement just like in world!!! :-) Below is the help menu. and below that the download link.

FILE
Open OAR File: open a packaged .oar archive.
Open OAR Folder: open an extracted OAR working folder.
Convert Data: export the loaded OAR using the format from Tools > Output Format. It reads the existing OAR object XML and companion assets, then writes converted output files to disk.
Convert Data does not create a new LLMesh object or save a replacement object XML. The XML already exists in the loaded OAR and is used as export input.

FILE MENU COMPATIBILITY
The converter is only supported for OARs produced by the actual simulator. Repacked or reverse-injected OARs created by this program are not backward-compatible with the converter and may fail if reopened through File > Open OAR File or File > Open OAR Folder and then converted again.

IMPORT
Step One: create blank.oar and prepare an extracted working folder for injection.
Inject Mesh: add one .dae, .gltf, or .glb model into an extracted OAR. Set location, scale, physics, rigging, and LODs here.
Pack Oar: repack the extracted folder into a final .oar archive.

TOOLS
Objects List: browse objects in the loaded OAR and export selected objects through the normal OAR export pipeline.
Objects List > Export: export one or more selected OAR objects into an output folder. Depending on format, the app may write the main file under Solids or Phantoms and may also create companion folders such as Textures, MTL, or BIN.
Objects List > Export does not create a standalone mesh inventory object. It converts from the object's existing OAR XML and asset data.
Output Format: choose DAE, OBJ, GLTF, GLB, FBX, or STL for export.
Settings: set ranges, shifts, terrain options, and folder prefixes.

INJECT MESH DIALOG FIELDS
Source model: the .dae, .gltf, or .glb file to insert.
Location X/Y/Z: the final placement of the inserted object in the target OAR region.
Current dimensions: read-only size of the source model after analysis.
Scale: uniform size multiplier. 1.0 keeps original size.
Physics: choose how collision data is generated. File mode uses a separate physics model.
Rigged: treat the source as a rigged or avatar-style model.
Include Joint Positions: keep joint position data when rigged import needs it.
Strip Joint Data: remove rigging data and force a static-style result.
LOD High/Medium/Low/Lowest: control each generated LOD level.
Mode: choose how each LOD is derived.
Target Tris: desired triangle count for that LOD when the selected mode uses a target.
Vertices: read-only estimate of vertex count for each generated LOD.

WORKFLOW: OAR TO BLENDER USING GLB
1. Open Tools > Output Format and select GLB.
2. Open the source OAR with File > Open OAR File or Open OAR Folder.
3. Run File > Convert Data.
4. Import the generated .glb files into Blender with File > Import > glTF 2.0.

WORKFLOW: BUILD A REPACKED OAR WITH MULTIPLE MODELS
1. Run Import > Step One once to create a blank working OAR.
2. Run Import > Inject Mesh once for each model you want to add.
3. Source files can be .glb, .gltf, or .dae. Rigged avatar-style models can use the Rigged and joint options.
4. Repeat Inject Mesh until all assets are placed.
5. Run Import > Pack Oar to write the final repacked archive.
PLEASE DO ENJOY!!!!ONLY IN OPENSIM!Feel free to report bugs and or other worthy insights. I have written the original makers of it but not gotten any replies so I do no tknow if they are around or not. It is legal opensource though. THe list of contributors is there. If anyone knows them tell them to say hello...
https://maze.bz/OARConv.html