I sent this via email, but for anyone else who is also using MegaSplat, you can download the integration file below. This will control terrain features such as snow, wetness, puddles, and raindrops based on the Tenkokw weather settings. One important thing to note is that by default snow will not accumulate unless the tenkoku temperature is below 32. If you uncheck the 'Temperature Controls' setting on this component then snow will accumulate regardless of the tenkoku temperature setting.
INSTRUCTIONS:
// This component controls integration between Tenkoku's weather system and MegaSplat
// USAGE:
// 1. Setup Tenkoku and MegaSplat in your scene.
// 2. Drag this component onto the terrain object in your scene.
// Rain, puddles, and snow speed settings are delineated in seconds. 60 seconds = 1 minute. If 'Use Tenkoku Time' is
// selected, then the given speed will be compressed according to Tenkoku time multiplier settings.
// When 'Temperature Controls' is checked the system will modulate the snow accumulation based on whether
// the temperature in Tenkoku is set at or below 32 degrees (f). If the temperature is above 32 degrees
// then snow will begin to melt and snow precipitation will wet the ground like rain instead. Also, if
// the temperature is below 32 degrees, then snow will not melt.
// When 'Melt Influences Wetness' is checked, then the terrain will apply wetness (via the RainPower setting)
// to the terrain as the snow begins to melt. It will only do this if the snow first reaches the given melt
// threshold (see private settings below). The wetness will then decline as normal according to rain Dry speed.
