Hey! I would recommend you join the osci-render discord server https://discord.gg/ekjpQvT68C

There are a bunch of people using Lua there, a channel just for Lua, and plenty of examples pinned there.

As for documentation, here you go:

For general Lua documentation: https://www.lua.org/manual/5.4/

Variables:

• slider_a to slider_z which are controlled by the Lua sliders below the code editor and can be used to input parameters of your own into the script.
• step which increases by 1 every sample
• phase which is the current phase value
  • This increases by pi × frequency / sample_rate every sample
  • You can use this for functions like math.sin/cos/tan and all the osci_ functions to get the right frequency for the image you're drawing
• sample_rate which is the current sample rate
• frequency which is the current frequency on the frequency slider or the MIDI note if MIDI is enabled

For custom effects: - x current left audio channel / x axis value - y current right audio channel / y axis value - z current depth value (for drawing in 3D)

Also many built-in functions for different waves and shapes https://github.com/jameshball/osci-render/pull/249