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Uploading Mesh Models

Introduction

Before you can upload mesh objects, you must:

  • Have payment information on file. You can add payment information by visiting the Billing Information section of your Second Life account page.
  • Complete the Mesh IP Tutorial (if you're using the Aditi beta grid, click here instead), which verifies your knowledge of intellectual property rules. Be sure you own the rights or have permission from the rights owner before uploading your mesh content. Violations of intellectual property rights can result in the suspension or termination of your Second Life account and may even cause the permanent revocation of your ability to upload mesh objects!
  • Have at least one compatible COLLADA (.dae) file on your computer. You can create your own by using most popular 3D software packages, or, if you have the appropriate rights, you can download models created by other 3D artists from online repositories.

You may check your mesh upload status at any time by visiting your account page on the Second Life website.

Uploading - Quick Start

If you're new to uploading mesh models to Second Life, here's a quick and easy set of instructions to get you started. Don't worry about the myriad of controls in the upload window for now; they're for those who want fine control over their model's appearance and physics. For a more detailed breakdown of the upload procedure, keep reading below.

To upload a mesh model:

  • Choose a .dae file stored on your computer by going to the top menu and choosing Build → Upload → Mesh Model. If you don't have any models on your computer, you may download some from the SL sample content page.
  • Preview your model's automatically generated levels of detail on the Level of Detail tab by clicking High, Medium, Low, and Lowest. Notice how the object's complexity is reduced at each level.
  • Click the Physics tab and choose Lowest from the dropdown menu in Step 1: Level of Detail. Step 2 and Step 3 are not required.
  • Click the Upload options tab and check the boxes for any additional features on your model, such as textures.
  • Click Calculate weights & fee, then review the resource weights, land impact, and Linden dollar upload cost of your model.
  • Click Upload to upload your model to Second Life.

Uploading - Step by Step

Step 1: Choose a Model to Upload

Second Life accepts COLLADA (.dae) models, which can be edited and created in many popular 3D modeling packages.

To begin uploading a model:

  • Choose Build → Upload → Mesh Model.
  • Select the .dae file on your computer and click Open.
  • In the Upload Model window, enter a suitable name for your model in the Model name field.
  • If your model includes textures, check the Textures box underneath the Preview pane to make sure the textures are displayed properly.

Step 2: Define Visual Levels of Detail

Levels of detail determine what your model looks like from various distances. As you get farther away from a model, it renders in less detail to boost visual performance. Second Life generates these lower detail models by default, but you may use this step to tweak each level or even upload your own lower detail models. You can preview your model at any level of detail by clicking High, Medium, Low, or Lowest.

While previewing your model at each level of detail, you may change the parameters used for simplifying it from your original model if you chose Generate from one of the Source dropdown menus. For full details on Triangle Limit and Error Threshold, see Upload Model UI reference on the SL Wiki.

Alternately, you may upload your own simplified models by choosing Load from file from the Source dropdown menus. You may wish to create your own lower-detail models in order to preserve critical details that may be lost during the automatic simplification process.

For more, see also Mesh Upload - Level of Detail

Step 3: Define the Model's Physics Shape

A model's physical shape, as interpreted by Second Life's physics engine for calculating collisions, can be different from its visual shape. For example, you may wish to simplify a very complex vehicle into a square physical box shape, which allows you to have a visually complex vehicle that requires comparatively little physics computation and does not overtax the region's ability to process moving physical objects. You may upload your own physics representation as a .dae file or you may use Second Life's analysis and simplification tools to generate a physics shape automatically.

The quickest way to generate a physics model for your object is to choose Use Level of Detail and select a level of detail from the dropdown menu. This creates a physics model based on one of your model's visual levels of detail. Remember that lower physics costs are desirable, so choose the lowest level of detail that reasonably represents the shape of your model.

You do not need to complete Step 2: Analyze or Step 3: Simplifiy unless your physics model is extremely complex or shows red lines in the preview window. For advanced information on usage of the physics analysis and simplification tools, see Upload Model UI reference.

For more, see Mesh Upload - Physics

Step 4: Upload Options

Before you upload, make sure to include any necessary optional parameters on the Upload Options tab:

  • Scale: Changes the base size of your model. Increasing the scale increases the resource cost.
  • Include Textures: Includes any textures applied to the COLLADA model. The textures are automatically applied to the Second Life version of the model when it is uploaded.
  • Include Skin weight: Includes any skin weight information in the COLLADA model. This option only applies to models that are meant to move and flex with your avatar when worn as avatar attachments.
  • Include Joint positions: Includes joint position information from the COLLADA file. This option only applies to models that are meant to alter an avatar's joint positions when worn as an attachment.
  • Pelvis Z Offset: Changes the vertical positioning of a rigged model.

For more, see Mesh Upload - Upload Options

Step 5: Calculate Weights & Fee

When you click Calculate weights & fee, Second Life calculates the download, physics and server weights of your model in order to determine its land impact and Linden dollar upload cost. The base Linden dollar cost to upload is L$10 plus L$10 for each texture applied to the model, and an additional cost based on the complexity of the model.

Step 6: Upload

When you upload a model, it appears in the Objects folder in your inventory. As with all objects in Second Life, you can then drag it from your inventory to the ground, or you can wear it as an attachment.

Rigging options

Rigged models allow you to represent your avatar skeleton as a mesh that conforms to your joints and motions. This means that you can wear a rigged model that changes the length and orientation of your avatar's limbs and animates accordingly.

If your COLLADA model contains joint position and skin weight information, you can preview how it will look with an avatar's default idle animation by checking the Skin weights box underneath the Preview pane.

You may wear a rigged model by right-clicking it in your inventory and selecting Wear. You may often wish to pair a rigged model with an alpha mask to hide your avatar's normal shape.


From http://community.secondlife.com/t5/English-Knowledge-Base/Uploading-a-mesh-model/ta-p/974185

fs_mesh_upload.txt · Last modified: 2012/07/02 00:32 by miro.collas