Blend_My_NFTs

Description

Blend_My_NFTs is an open source, free to use Blender add on that enables you to automatically generate thousands of 3D Models, Animations, and Images. This add on’s primary purpose is to aid in the creation of large generative 3D NFT collections.

For support, help, and questions, please join our wonderful Discord community: https://discord.gg/UpZt5Un57t

Checkout the newest tutorial on YouTube that goes along with this documentation: https://www.youtube.com/watch?v=SwU4iVy1XpU

This add on was developed to create the This Cozy Place NFT project which is now availabe to mint on ThisCozyStudio.com

0001-0395.1.mov

The video above illustrates the first 10 Cozy Place NFTs generated with Blend_My_NFts.

Official Links:

Website: https://thiscozystudio.com/

Discord: https://discord.gg/UpZt5Un57t

Youtube: https://www.youtube.com/c/ThisCozyStudio

Twitter: https://twitter.com/ThisCozyStudio

Instagram: https://www.instagram.com/this_cozy_studio/

Reddit: https://www.reddit.com/r/ThisCozyPlace/

Case Studies

This document has a list of projects that use Blend_My_NFTs to help facilitate them in the creation of their collection: https://docs.google.com/document/d/e/2PACX-1vSHZS4GRu8xXDYpVPEaxyBeTzms9yrJEC9IoAcP38_U8x0C1kVrbtNZgh0zUmkzBoZQVwNvBf3ldRij/pub

Donations

Blend_My_NFTs, this readme documenation, YouTube tutorials, live stream Q/As, and the Discord community are all provided for free by This Cozy Studio for anyone to use and access. We only ask in return that you credit this software and kindly share what our team has built. A direct link to the Blend_My_NFTs Github page on your projects website (or equivelant social platform) would sefice. We ask you to share this tool because we feel there are many out there that would benefit from it, our only goal is to help those in need. It warms our hearts that so many people use this add-on.

Any donations to the following methods will be put towards developing Blend_My_NFTs and future related Metaverse/Blockchain projects. This Cozy Studio has big plans for Blend_My_NFTs in 2022 and we value your support!

PayPal: https://www.paypal.com/paypalme/TorrinLeonard

Crypto Addresses:

Cardano: addr1qxzuqz0c32ucga8amwk53unt7vhyf56q73x55aec2lm8esv9cqyl3z4es360mkadfrexhuewgnf5pazdffmns4lk0nqsfylz24
Solana: A7NuHB79DKfkdZMvqVzBrYN4NXRqP7LVFjMdVoKRfVmo
Ethereum: 0x335408858ce319Cb411090792Ba4BCEE6a2d10CB
USDC (ETH Network): 0x335408858ce319Cb411090792Ba4BCEE6a2d10CB

We at This Cozy Studio really appreciate all the support our community has given us, you push us forward and inspire us to accomplish great things. We are nothing without you.

Thank you,

This Cozy Studio team

Quick Disclaimer

Blend_My_NFTs works with Blender 3.0.0 on Windows 10 or macOS Big Sur 11.6. Linux is supported, however I haven’t had the chance to test this functionality and guarantee this. Any rendering engine works; Cycles, Eevee, and Octane have all been used by the community without issue. This add-on only works in Blender, a Cinima 4D port will be investigated in the future.

Example Files

The YouTube tutorials use three different .blend example files. This repository has all three and includes a readme.md file that outlines which videos use which files and by what date: https://github.com/torrinworx/BMNFTs_Examples

Blend_My_NFTs
Setup and Installation
Important Terminology
Blender File Organization and Structure
- Example of Proper BMNFTs Compatable Blender Scene
Steps to Generate NFTs
Custom Metadata Fields
- Custom Fields Schema
Logic
- Logic JSON Schema
  - Schema Definition
  - Rule Types
- Example Logic.json File
  - Never with, Logic Rule Examples
  - Only with, Logic Rule Examples
Notes on Rarity and Weighted Variants
- .Blend File Rarity Example
- More complex Rarity Example
Notes on Meta Data and Standards
Calculating Maximum Number of NFTs (Max Combinations)
I have my NFTs, what next?
Running Blend_My_NFTs Headlessly

Setup and Installation

Here are the steps you need to take to get the Blend_My_NFTs add-on installed in Blender:

Click the green Code button at the top of this page.

From the drop down click Download ZIP. This will download Blend_My_NFTs-main.zip to your Downloads folder:

Move the Blend_My_NFTs-main.zip file to your desktop:

Open Blender and navigate to Edit -> Preferences -> Add-ons:

Click the Install button:

In the Blender File View window, navigate to the Blend_My_NFTs-main.zip file downloaded in step 1., select it, then click Install Add-on:

Navigate back to the Add-ons window in step 4., and search for Blend_My_NFTs:

Click the Checkbox to enable the Blend_My_NFTs add-on:

Now that Blend_My_NFTs is installed in your instance of Blender you can find the main panel in the 3D View tab in Layout, once you are there tap N on your keyboard to open the side panel:

Important Terminology

Before you can continue further, there are terms used in this documenation to describe the process of this software. This makes it easier to understand how you need to organize your .blend file to generate NFTs. Refer to this section if you come accross an unfamiliar term.

Let’s say you are creating an NFT collection, the artwork is a .png of a person wearing a hat:

Attribute – A part of the .png that can be changed. The idea of a Hat on a man is an Attribute, there are many types of Hats, but the Hat itself I will refer to it as an Attribute.
Variants – These are the types of Hats; Red Hat, Blue Hat, Green Hat, Cat Hat, etc. These can be swapped into the Hat Attribute to create unique .png NFTs.
DNA – A sequence of numbers that determins what Variant from every Attribute to include in a single NFT .png. Blend_My_NFTs creates and stores a uniqe DNA sequence for each NFT you create. These numbers are stored in the NFTRecord.
NFTRecord – The “Ledger” of all DNA for your NFT collection. This will be generated after you create all the Attribtues and Variants that make up your NFT collection in Blender.
Batch – A randomly selected subset of DNA, taken from the NFTRecord. Blend_My_NFTs can split the NFTRecord into multiple Batches; This allows you to render or create NFTs on multiple computers, or at seperate instances in time.

Blender File Organization and Structure

Important – Every object, model, texture, camera, light etc. must be in the same .blend file! If you have mulitiple .blend files, Blend_My_NFTs is unable to open and process them. It’s recommended to keep your file’s total size 5gb, so if you have multiple files created already, reduce the size and then merge them to a master file.

Organizing your NFTs Attributes and Varariants in Blender is essential to generate files with Blend_My_NFTs. Follow the organizational rules below when making your NFT .blend file:

Your .blend file scene must contain a Script_Ignore collection. Make sure the name is exactly Script_Ignore, include the underscore and capitalization.

Any objects (Lights, Cameras, Background images, etc.) that stay constant throughout every NFT file are to be placed in this Script_Ignore collection. Script_Ignore may contain sub collections and all naming conventions are not required withing this collection.

Every Attribute is represented by a collection placed directly in the Scene collection. The name of these attribute collections can not contain numbers or the underscore (_) symbol. The name can contain spaces
Every Variant of each Attribute is represented by a collection. These collections are to be placed in the corresponding Attribute colleciton. The naming convention of these Variant collections is as follows:

<Name of Variant>_<Order Number>_<Rarity Percentage>
- Name of Variant ==> Any string/number/symbol combination, must not include the underscore (_) symbol. Can contain spaces.
- Order Number ==> An incrementing number. Must increment for each Variant added to a given Attribute starting at 1, numbers cannot repeat and must be unique for each Variant. Can only be in a single number format, do not use 001 or 0001 formats.
- Rarity Percentage ==> A percentage that determins the chance that the given variant will be selected. Must be a number, can contain decimals, cannot contain the percentage (%) symbol. See Notes on Rarity and Weighted Variants section for more details.
Each Variant collection can contain everything that makes up an individual Variant; it can contain objects, lights, meshes, planes, and every other object type.

Example of Proper BMNFTs Compatable Blender Scene

In this example, notice how the main components in Script_Ignore can be any type of object. The collections Body and Arms are both Attribute collections; Silver Body_1_75 and Gold Body_2_25 are Variants of the Body Attribute, and have a 75% and 25% generation chance. Silver Arms_1_75 and Gold Arms_2_25 are Variants of the Arm Attribute and have the same weighted distribution as the Body Variants. Notice how the Variant collections in the Arm Attribute can contain more than one object and object type, this principle can be applied to any Variant collections.

This repository contains three .blend example files that are compatable with Blend_My_NFTs: https://github.com/torrinworx/BMNFTs_Examples

Steps to Generate NFTs

After you have formatted and organized your NFT collection in Blender to the rules outlined above in Blender File Organization and Structure you can now go about generating your NFT collection. By the end of this process you will have a folder continaing the following:

NFT media files; images, animations, or 3D models in any format that you specify.
Json metadata files; one fore each NFT content filem, formatted to the blockchain standard that you set.

Before you get started, open the .blend of your NFT collection and open the side panel of the Layout tab so that Blend_My_NFTs is visible:

Each Step below is represented by one panel; everything you have to do for that one step, is in the corosponding panel in Blend_My_NFTs.

Step 1. – Create NFT Data

Blend_My_NFTs needs data to understand your .blend file, in this step you will create that data.

Isolate or open the Create NFT Data panel in Blend_My_NFTs:

Set the name of your NFT collection in the NFT Name: text field:

This name will be in the metadata and in the name of each NFT content file.

Note – Maximum Number Of NFTs: ### is the maximum number of NFTs your collection can contain with it’s current number of Attirbutes and Variants.

Note – Recommended Limit: ## is the recommended number of NFTs Blend_My_NFTs is able to generate. Higher than this, e.i. closer to Maximum Number of NFTs can result it loss of NFT count and weighted Variants not appear as often as you expect them to. It is recommended that you keep your NFT Collection Size below this number.

Set your NFT collection size with the NFT Collection Size field:

Important: This number must be greater than 0 and less than Maximum Number Of NFTs shown at the top of the Create NFT Data panel.

Set the NFTs per batch with the NFTs Per Batch field:

Important: This number must be greater than 0 and less than or equal to Maximum Number Of NFTs shown at the top of the Create NFT Data panel.

Set the Save Path of your Blend_My_NFTs Output folder by clicking on the file icon and navigating to a directory:

Then click the Accept button.

Desktop is recommended for easy access, but any directory will do.

Enable or Disable Rarity and Weighted Variants with the checkbox Enable Rarity. For more information on what affect this has on your NFT collection, see Blender File Organization and Structureand Notes on Rarity and Weighted Variants.

Enable or Disable Logic with the checkbox Enable Logic. For more information on what affect this has on your NFT collection, see Logic.

If you enabled Logic, set the location of the Logic.json file you created in the Logic File field. Click on the file icon and navigate to the location of the json file. To create a Logic.json file, see the Logic section.

Lastly click the Create Data button:

After completeing the Create NFT Data step, you should have the following files and folders located at the Save Path set in step 6. above;

Blend_My_NFTs Outuput folder. A directory that contains all output files from Blend_My_NFTs.
- NFT_Data folder. This contains the following NFTRecord.json and Batch#.json files.
  - NFTRecord.json file. A ledger that contains the NFT DNA of your collection.
  - Batch_Data folder. Contains all Batch#.json files.
    - Batch#.json files. Smaller chuncks of the NFTRecord.json that contain unique DNA.
- Generated NFTs folder. This directory will be empty, but is where your NFT content files will be exported to. once you’ve completed Step 2. Generate NFTs.

Step 2. – Generate NFTs

In this step, you will select the types of NFT content files you wish to generate, as well as the formats you want them in. You will then generate these files in batches, or all at once.

Isolate or open the Generate NFTs panel in Blend_My_NFTs:

Check the NFT content files you wish to generate (you can select more than one):

If you check Image, choose the file format you want the NFT content files to be exported as from the Image drop-down:

.png –> Exports image as .png
.jpeg –> Exports image as .jpeg
If you check Animation, choose the file format you want the NFT content files to be exported as from the Animation drop-down:

.avi (AVI_JPEG) –> Exports animations in AVI_JPEG encoding to .avi file format. See Blender API for more information.
.avi (AVI_RAW) –> Exports animations in AVI_RAW encoding to .avi file format. See Blender API for more information.
.mkv (FFMPEG) –> Exports animations in FFMPEG Blender default encoding and container to .mkv file format. See Blender API for more information.
If you check 3D Model, choose the file format you want the NFT content files to be exported as from the 3D Model drop-down:

.glb –> Exports .glb 3D models
.gltf + .bin + textures –> Exports .gltf 3D models with seperated textures
.gltf –> Exports .gltf 3D models with embeded textures
.fbx –> Exports .fbx 3D models
.obj –> Exports .obj 3D models
.x3d –> Exports .x3d 3D models
.stl –> Exports .stl 3D models
.vox –> Exports .vox MagicVoxel 3D models. Experimental: This file format is still in development and might not work as intended. Important: You must install the voxwritter Blender add-on for this feature to work.

Select number of the Batch you wish to generate in the Batch to Generate feild:

Click the Generate NFTs Button. This will generate the NFT content files from the Batch set in above step 3:

To generate the rest of the Batches you have, repeat steps 3. to 4. and increment the Batch To Generate number.

After completeing the Create NFT Data step, you should have the following files and folders located at the Save Path set in Step 1. Create NFT Data above;

Blend_My_NFTs Outuput folder. A directory that contains all output files from Blend_My_NFTs.
- NFT_Data folder. This contains the following NFTRecord.json and Batch#.json files.
  - NFTRecord.json file. A ledger that contains the NFT DNA of your collection.
  - Batch_Data folder. Contains all Batch#.json files.
    - Batch#.json files. Smaller chuncks of the NFTRecord.json that contain unique DNA.
- Generated NFTs folder. This directory will be empty, but is where your NFT content files will be exported to. once you’ve completed Step 2. Generate NFTs.
  - Batch#.json folder. There should be one folder for each batch that you generated.
    - Image folder. The folder where all the NFT Image content files are stored for a given Batch#.json.
      - Image files. These images will contain have the name you specified in Step 1. Create Data, an incrementing number, and the file extension you specified above.
    - Animation folder. The folder where all the NFT Animation content files are stored for a given Btach#.json.
      - Animation files. These animations will have the name you specified in Step 1. Create Data, an incrementing number, and the file extension you specified above.
    - 3D Model folder. The folder where all the NFT 3D Model content files are stored.
      - 3D Model files. These 3D models will have the name you specified in Step 1. Create Data, an incrementing number, and the file extension you specified above.
    - BMNFTs_metaData folder.
      - Data_#.json files. These files are used by Blend_My_NFTs backend in Step 3. – Refactor Batches & Create MetaData. These can be ignored, unless you are customizing the metaData.py script.

Step 3. – Refactor Batches & Create MetaData

In this step you will combine the batch files created in Step 2. – Generate NFTs into one cohesive folder that is ready to be uploaded to the blockchain of your choice. This step will also generate the metadata needed for smart contract minting sites.

This step is to be done after you have completely rendered and generated all of your NFT batches; once you complete this step, you cannot undo the changes.

Isolate or open the Refactor Batches & Create MetaData panel in Blend_My_NFTs:

Check off the metadata templates you wish to generate (You can create more than one):

For more information on the metadata generated by Blend_My_NFTs and the standards that are followed see Notes on Meta Data and Standards.

For each metadata template standard you can set a description, this will appear in the metadata json file of the given template.

If you want custom metadata fields, check the Enable Custom Metadata Fields checkbox and set Custom Fields File to the Custom_Fields.json file you create in the Custom Metadata Fields section.
Click the Refactor Batches & Create MetaData button:

Confirm you wish to refactor your batches by clicking the Refactor your Batches? button in the popup dialogue:

After completeing the Refactor Batches & Create MetaData step, you should have the following files and folders located at the Save Path set in Step 1. Create NFT Data above:

Blend_My_NFTs Outuput folder. A directory that contains all output files from Blend_My_NFTs.
- NFT_Data folder. This contains the following NFTRecord.json and Batch#.json files.
  - NFTRecord.json file. A ledger that contains the NFT DNA of your collection.
  - Batch_Data folder. Contains all Batch#.json files.
    - Batch#.json files. Smaller chuncks of the NFTRecord.json that contain unique DNA.
- Complete_Collection folder. A refactored version of the Generated NFTs folder, with all batches reordered and refactored and generated metadata templates.
  - Image folder. The folder where all the NFT Image content files are stored.
    - Image files. These images will contain have the name you specified in Step 1. Create Data, an incrementing number, and the file extension you specified above.
  - Animation folder. The folder where all the NFT Animation content files are stored.
    - Animation files. These animations will have the name you specified in Step 1. Create Data, an incrementing number, and the file extension you specified above.
  - 3D Model folder. The folder where all the NFT 3D Model content files are stored.
    - 3D Model files. These 3D models will have the name you specified in Step 1. Create Data, an incrementing number, and the file extension you specified above.
  - BMNFTs_metaData folder.
    - Data_#.json files. These files are used by Blend_My_NFTs backend in Step 3. – Refactor Batches & Create MetaData. These can be ignored, unless you are customizing the metaData.py script.
  - Cardano_metaData folder; will appear if specified in Step 2. above.
    - Cardano_Data_#.json files. Will contain metadata template in Cardano CIP 25 format.
  - Solana_metaData folder; will appear if specified in step 2. above.
    - Solana_Data_#.json files. Will contain metadata template in Solana Metaplex format.
  - ERC721_metaData folder; will appear if specified in Step 2. above.
    - Erc721_Data_#.json files. Will contain metadata template in ERC721 format.

Congratulations!! You now have a complete 3D NFT collection that is ready to upload to the blockchain of your choice!

Custom Metadata Fields

This section will cover how to implement custom metadata fields. The method is the same for the Cardano CIP-25, Solana, and ERC721 standards.

These fields are determined by a .json file that you manually create. For the pruposes of this documentation, just think of JSON as a text file (.txt) that we can use to store information. You can name this file anything, but for this tutorial lets call it Custom_Fields.json.

If you need help creating a JSON file, checkout this tutorial: How to Create JSON File?

To learn more about JSON files and how to structure data read this article: Working with JSON

Custom Fields Schema

If you’d like, copy and paste this template into the JSON file you created above:

{
  "<item 1>": "<content of item 1>", 
  "<item 2>": "<content of item 2>", 
  "<item 3>": "<content of item 3>", 
  "<item 4>": "<content of item 4>"
  ...
}

Each item in this dictionary will be sent to the attributes feild of a given metadata standard. For example, this is what a Cardano template would look like once these fields are applied:

{
 "721": {
  "<policy_id>": {
   "Logic Test_1": {
    "name": "Logic Test_1",
    "image": "",
    "mediaType": "",
    "description": "",
    "Cube": "Red Cube",
    "Sphere": "Red Sphere",
    "<item 1>": "<content of item 1>", 
    "<item 2>": "<content of item 2>", 
    "<item 3>": "<content of item 3>", 
    "<item 4>": "<content of item 4>"
   }
  },
  "version": "1.0"
 }
}

Logic

This section will go over the process of creating and using rules for your NFT collection, we will refer to this process as Logic.

Logic is deterimened by a .json file that you manually create. For the purposes of this documentation, just think of JSON as a text file (.txt) that we can use to store information. You can name this file anything, but for this tutorial lets call it Logic.json.

If you need help creating a JSON file, checkout this tutorial: How to Create JSON File?

To learn more about JSON files and how to structure data read this article: Working with JSON

Logic JSON Schema

If you’d like, copy and paste this template into the JSON file you created above:

{
    "Rule-1":{
        "Items-1": [
            "<collection name>"
        ],
        "Rule-Type": "<rule type>", 
        "Items-2":[
            "<collection name>"
        ]
    },
    "Rule-2":{
        "Items-1": [
            "<collection name>"
        ],
        "Rule-Type": "<rule type>", 
        "Items-2":[
            "<collection name>"
        ]
    }
}

Schema Definition

Rule-# A dictionary representing the information of a single defined Rule of an NFT collection. There can be as many as you choose. Increment the # when you create a new rule.
Items-1 A list of strings representing the names of Attribute(s) or Variant(s).
Rule-Type The rule that governs the relation between Items-1 and Items-2. Has two possible values: Never with and Only with.
Items-2 A list of strings representing the names of Attribute(s) or Variant(s).

Rule Types

There are two rule types:

Never With –> If selected, Items-1 will never appear if Items-2 are selected. For each NFT DNA that is generated, either Items-1 or Items-2 are randomly selected. That selected Items List is then acted upon depending on if the items in the list are Attributes or Variants:
- If Items List contains complete Attribute(s), those Attribute(s) will be set to Empty automatically.
- If Items List contains Variant(s), the other Variants in that Variants Attribute will be randomly or weightedly selected depending on if you have Enable Rarity selected when you create NFT data.
Only With –> If selected, Items-1 will only appear if Items-2 are selected. If Items-1 contains complete Attribute(s), those Attribute(s) will be set to Empty automatically. Meaning they will not appear if you export images, animations, or 3D models. Items in Items-2 can only be a single Variant, no attributes, and no list of variants.
Always With –> If selected, Items-1 will always appear if Items-2 are selected.Items-1 CANNOT contain complete Attribute(s) and is limited to single Variants. The list can contain multiple Variants, however they must be from seperate Attributes.

The best way to understand how Logic works is to think of it as a sentence, example: "Items-1 Never goes with Items-2" or "Items-1 Only goes with Items-2".

Important: The more rules you add the higher the chance a rule conflict may arise, and you may see Attribute and Variant behaviour that you do not desire.

Example Logic.json File

Say we have the following scene in a .blend file: Note that we have two Attributes, Cube and Sphere, and that they have 4 Variants. If you’d like to follow along with this example I’d recommend downloading the Logic_Example.blend.

Never With, Logic Rule Examples

Never With, Variants example: In this example, the Variant Red Cube_1_25 never appears with Red Sphere_1_25:

{
  "Rule-1":{
      "Items-1": [
          "Red Cube_1_25"
      ],
      "Rule-Type": "Never With", 
      "Items-2":[
          "Red Sphere_1_25"
      ]
  }
 }

Never With, Attributes example: In this example, the Attribute Cube never appears with Red Sphere_1_25. When Red Sphere_1_25 is selected, no Variants in the Cube Attribute are selected, and hence the Attribute is set to “Empty”:
```
{
  "Rule-1":{
      "Items-1": [
          "Cube"
      ],
      "Rule-Type": "Never with", 
      "Items-2":[
          "Red Sphere_1_25"
      ]
  }
 }
```

Only With, Logic Rule Examples

Only With, Variants example: In this example, the Variant Red Cube_1_25 only appears with Red Sphere_1_25:

{
  "Rule-1":{
      "Items-1": [
          "Red Cube_1_25"
      ],
      "Rule-Type": "Only With", 
      "Items-2":[
          "Red Sphere_1_25"
      ]
  }
 }

Only With, Attributes example: In this example, the Attribute Cube only appears with Red Sphere_1_25:

{
  "Rule-1":{
      "Items-1": [
          "Cube"
      ],
      "Rule-Type": "Never With", 
      "Items-2":[
          "Red Sphere_1_25"
      ]
  }
 }

Now that you have a completed Logic.json file, you can now go back and complete Step 1. Create Data!

Common Issues and Problems

The most common issues people face are naming convention issues (See Blender File Organization and Structure). People often miss the naming convention on one or two collections and this typically throws up an error. The best way to resolve this is by reviewing the Blender File Organization and Structure standards and go through each collection in your Blender scene.
Remember that each Attribute and each Variant are represented by a collection if this is not the case your Max Number of NFTs will be a negative number or 0.
If you make ANY changes to your Blender scene, you need to re-Create NFT Data, otherwise Blend_My_NFTs wont be able to recognize the changes.

Notes on Rarity and Weighted Variants

Rarity is a percentage value and accepts fractions like 0.001%, but they must be specified with decimals in the naming (fraction like 1/2 or 3/5 are not permitted in the naming structure). For ease of use the percentages should add up to 100%:

33% + 33% + 33% + 1% = 100% 

Variant 1 = 33% chance
Variant 2 = 33% chance
Variant 3 = 33% chance
Variant 4 = 1% chance

If you have 20 variants with 50 set as the rarity percentage for each, Blend_My_NFTs will add up the percentages then treat the sum as 100%:

50% + 50% + 50% + 50% + 50%....
= 1,000%

Out of 100%:

(50/1,000)*100 = 5% chance of 1 variant

Rarity is dependent on both the number of NFTs you generate, as well as the maximum number of possible combinations of the Attributes and Variants in your .blend file.

This results in the following two scenarios, say, at a fixed number of 10,000 NFTs to generate;

Your .blend file has 1,000,000,000 possible combinations (trust me that’s a small number, our collection for This Cozy Place has over 11 Trillion possible combinations). Generating 10,000 will be more representative of the rarity numbers you set as the script will simply have more combinations to choose from.
Your .blend file has 10,000 possible combinations. This means all possible combinations of your NFT will be generated, meaning that no rarity can be taken into account.

This happens for the following reasons:

The rarity is determined pseudo randomly, but is weighted based on each Variants rarity percentage.
The scripts generally prioritize the number of NFTs to generate (maxNFTs) over rarity percentage

This behaviour is a fundamental mathematical result, not an issue with the code. I’ve researched various ways of creating and enforcing rarity, this is the only way I have found that works. If you have found a better method, feel free to make a pull request explaining it and I’d be happy to review and merge it to the main Github repo for BMNFTs.

.blend file Rarity examples:

With Rarity percentage (50% 50% split)

  Hat <-- Attribute
  |-Green Hat_1_50
  |-Red Hat_2_50

Since it’s 50/50 it can also be expressed like this:

  Hat <-- Attribute
  |-Green Hat_1_0
  |-Red Hat_2_0

Leaving the rarity number as 0 will randomly select 1 of the variants you set in your .blend file. Note that this only works if every variant’s rarity is set to 0. For an attribute its rarity or random, not both. You can have different attributes, where some are using rarity and others are randomly selected, but you cannot mix these with variants of one attribute.

More complex Rarity Example:

  Hat <-- Attribute
  |-Green Hat_1_24.75
  |-Red Hat_2_24.75
  |-Blue Hat_2_24.75
  |-Orange Hat_2_24.57
  |-Purple Hat_2_0.5
  |-Yellow Hat_2_0.5

In the example above, Green, Red, Blue, and Orange hats all have an equal chance of getting selected. However Purple and Yellow hats will only appear on average 0.5% of the time. We recommend rounding to about 5 decimal places for simplicity, as numbers of more accuracy aren’t really needed for NFT collections 10,000 or smaller.

The code that determines rarity can be found the Rarity_Sorter.py.

Calculating Maximum Number of NFTs (Max Combinations)

Mutliply the number of Variants in each Attribute by each other.

Example:

In the image above there are two Attributes; Body, and Arms. Each attribute has 2 Variants, so in order to find the Maximum Number of NFTs we do the following:

Number of Variants in Arm Attribute = 2 
Number of Variants in Body Attribute = 2 

(Number of Variants in Arm Attribute)*(Number of Variants in Body Attribute) = Maximum Number of NFTs

2*2 = 4

∴ The Maximum Number of NFTs is 4

The formula for this equation can be simplified to the following:

N ₁ *N ₂ *N ₃ *… = Max _NFTs

Notes on Meta Data and Standards

Blend_My_NFTs can export Cardano, Solana, and ERC721 formatted metadata templates. After running Refactor Batches & Create MetaData a template will be generated for each NFT you have created; These templates will include properly formated names for each Attribute and Variant that was selected to create that NFT.

Blend_My_NFTs can only provide this information in the templates, you will have to add Policy ID and URL when you upload and mint your NFT collection. For more information on how to do this see I have my NFTs, what next?

Meta Data Template Sources

The list of meta data standard sources used to create the templates:

Cardano CIP25 –> https://cips.cardano.org/cips/cip25/
Solana Metaplex –> https://docs.metaplex.com/token-metadata/specification
ERC721 –> https://docs.opensea.io/docs/metadata-standards

The Blend_My_NFTs code implementation for the above standards can be found in main>metaData.py.

Meta Data Disclaimer

These meta data templates are based on the common standards for the given blockchain, you will have to modify and fill them in with a script of your own when you mint your NFT collection. These metadata templates are only provided for your convenience and are as accurate to the standards above that I could make them.

I have my NFTs, what next?

Bulk file renaming

OpenSea and other NFT marketplaces and tools might require a specific naming convention for NFT media and metadata files. Blend_My_NFTs doesn’t currently follow these file naming conventions, but this will be added in a future version. For now, the best no code workaround is to use a bulk file renamer suggested by itachimoonshot | Kaavan Labs in the This Cozy Studio Discord server:

Microsoft Power Toys – Power Rename

Running Blend_My_NFTs Headlessly

If you are working with Blender in an environment where you can’t use the user interface to change settings within the addon, such as Google Colab, you can instead pass in a config file containing the settings from your local instance.

In order to generate this config file, you can use the Export BMNFT settings to a file button. This file will be saved in the folder indicated by the Save Path field.

Once you have this config file, you can run this addon in Blender headlessly by running this command from the directory of your Blender installation:

On Windows

.\blender.exe --background <path to your .blend file> --python <path to Blend_My_NFTs __init__.py> -- --config-file <path to the generated config.cfg> --operation create-dna

On Linux

./blender --background <path to your .blend file> --python <Path to Blend_My_NFTs __init__.py> -- --config-file <path to the generated config.cfg> --operation create-dna

There are two mandatory arguments that you need to run this script from the terminal/command line:

Config file location

This argument tells Blend_My_NFTs where to find your config.cfg file in order to load your desired settings.

--config-file
Operation

This argument tells Blend_My_NFTs which operation you want to perform.

--operation with one of the following three options afterwards:
```
create-dna
generate-nfts
refactor-batches
```

There are also additional optional arguments that you can use:

Change Save Location

This argument takes priority over the save path indicated in config.cfg.

--save-path
Change Batch Number

This argument takes priority over the batch number specified in config.cfg.

--batch-number
Use Batch Data in a non standard location

Use batch data from a separate folder rather than the folder Blend My NFTs uses by default.

--batch-data

You can also view this information from your terminal/command line by running: