Create a PNG file from a glb (= glTF binary = Graphics Library Transmission Format https://en.wikipedia.org/wiki/GlTF).
## Introduction
This exercise will walk thorugh the creation of a PNG from the included glb. The purpose is to show the steps taken to create the PNG which can be duplicated in a mass conversion script.
You will be using the command console.
The scripts run will create a small server; however, it will automatically select a port needed for the process so you do not have to be concerned of a port conflict, e.g. 3001, if you have another server running elsewhere on the system. The kernel selects a currently unused high-numbered port (typically in the 32768–60999 range on Linux).
## Prerequisites
Node package: puppeteer
## Steps
Open a command console and change to the following subdirectory:
cd web/batch_glb_png/glbs
for this exercise, create a soft link within glbs to just one file, we're only goint to perform a single PNG to demonstrate the scripts. Normally, directory glbs will have links to the actual glbs staged (how those links are created is another exercise)
Change to to the upper directory from within ```web/batch_glb_png``` and then launch the conversion script. Note the run will use the job.json I created, when time comes when you want to use yours, then specify the path and filename to your PNG profile:
Using the steps above, you created a single PNG from a glb.
The next step is to fill the glbs directory with links to the glbs perviously generated by Blender and then execute the same/similar command from within the '''web/batch_glb_png ''' directory:
node batch_render.js [your PNG specification, if you want]
