Release

OBJ Converter

SP4CEBAR 2023-01-27 13:09 (Edited)

Converts OBJ files to @nathanielbabiak's smaller format

Click here to read how it works

How to use:

• download an OBJ 3D model from the internet
• go to this hex converter and uncheck both boxes
• load and convert the file
• copy the hex data to the big string in this NX program
• run this NX program and follow the prompts

Whenever a disk is full:

• you're prompted to make a new disk
• the progress is stored in persistent RAM so that you can run the program again to resume the conversion

Afterward

• once it's done you should have one or more disks with data
• edit the data so that it's only one file for vertices and one file for faces
• find a tool to remove all line breaks
• put it in the strings inside an OBJ viewer NX program

Currently, a Blender Suzanne monkey head is loaded

SP4CEBAR 2023-01-30 10:04 (Edited)

Explanation of the main loop (do loop)

• first, it reads characters from the source OBJ file and collects them until it encounters a space or a line break, this string is called WORD$
• second, it checks if this word is a number, if it is:
  • it'll check if the type$ string is equal to "v" (vertex), if it is then:
    • it'll convert this number into a fixed point number in the way @nathanielbabiak described here
  • else if the type$ string is equal to "f" (face), if it is then:
    • it'll convert the number, and skip the steps that are for floats (these are integers) as described by @nathanielbabiak
• if the WORD$ is not a number then it's a type
  • it'll capitalize all non capital ascii codes to make them easier to work with in NX
  • it'll set the type$ string to word$
  • if it the new type$ is "#" (comment) it'll skip all text that comes after it until the next line break