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SNOWFALL FX - SIMULATION, SETUP, RENDERING, AND COMPOSITING
This is the old tutorial I did for creating a snowfall effect into SideFX Houdini using particles, mesh, and rendering with Mantra. Also, I show the process of a quick comp with Balck Magic Design Fusion.
All you need is Houdini!
quickly overview
create an emitter of particles and add a little force like a gravity
adding wind and turbulence, talking about how I split the force and applied the animation noise with the motion fx
adjustment of the turbulence effects and show a little tip for checking it very quickly
Create a big and small turbulence and drag force for assigned more variation motion and more natural effects
create a "for each lop" to instance the geometry on the particles. Talking about the pop spin and pop torque. Show also some settings (spin) with the VEX.
I show the alternative way to pop spin and pop torque with a POP Wrangles (VEX).
Create a Points Scale attribute (Pscale) and I show two ways: POP VOP and POP Wrangles, and discuss why I prefer to use scripting (VEX) to create an attribute of scale on the particles.
Adding more layers/emitter of particles, talking about the importance of the different layers, different scale and also talking on the pre-roll timeline with a production time (usually started from 1001 and not from 1)
Adjust the simulation and check the collision or adjustment of the life of some particles.
Create an external controller for each POPs networks.
Clear the network and do more orders inside it.
Create a camera view, clear the POPs Network and do a little summary of the simulation. Show how I organized the caches and start talking about the rendering.
Describe the lighting and rendering setting (in particular of the Motion Blur).
Material snow with the principled shader. Add the HDRI to the environment light talk about the "Take List" tab and show how to use it. Show how to render the chain/batch render with mantra for all different layers
Quickly video on the compositing using Blackmagic Fusion and the 3D Space inside it.
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