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All the Pyro simulation has been made in #Houdini and were exported using a 6-way exporter for #VFXGraph.

The sparks add a nice glow to the explosion. A lot of time has been spent on achieving nice randomization in the size, shape, and bending of the sparks.

The "dirt" system adds sharp details to the explosion and provides directionality by writing motion vectors. All particles are opaque with alpha clipping, which helps reduce overall overdraw.

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The “Linger Core” system help to do the dissipation of the “Core explosion”. The Core Explosion dissipation part isn’t long enough, so this system is delayed and spawn when the dissipation of the core explosion happens.

The "Linger side" system also helps anchor the explosion on the pedestal. It uses a looping 6-way lighting texture that is reused in several systems.

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"Tendril" system consists of 10-15 particles aligned with velocities. The directions of each burst is random, providing a nice sense of directionality to the explosion. This is using a 6-way lighting flipbook. In the future, I would like to try on a Trail output.

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The "Ground Blast" system is a single face-camera particle that uses particles with a 6-way lighting flipbook. This allows the explosion to be "anchored" to the pedestal.

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The Core Explosion is just a single particle using the new 6-way lighting output and a Flipbook created in #houdini. It helps hide the switch between the static and dynamic statue. As it is the "hero system," it is drawn on top of tendrils and lingering smokes #vfx.

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All the systems are orchestrated with a "Global Spawn System" that is responsible for spawning all the different systems. Each system can have its own spawner to control the number of particles emitted or to add a small delay relative to the global spawn.

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Alright, let's jump in #unity to talk about the #VFXGraph explosion.

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To finish the #Houdini side, the animation is converted to a Bones Anim using the new KineFX workflow. Each Pack Geo is a Point, so each Pack Geo can be converted to a Bone. The Capture Pack Geo allows for the procedural assignment of skin weight thanks to the "name attribute."

The simulation uses the Bullet solver for its speed. It includes basic piece-to-pieces and cluster constraints, as well as a static collider and a ground plane. The initial force is generated using a Pop Metaball Force node.

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Static parts are used as colliders in the simulation. To achieve this, the "Convex Decomposition" node is utilized. This node fractures the geo and creates convex hulls for each piece, making the geometry representation faster to simulate than "Concave" for the Bullet solver.

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After this, the “RBD cluster” node was used to create constraints that will hold pieces together until enough stress or impact breaks them apart. This is also a nice way to get more interesting fracture pieces.

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After completing the previous step, I used the “RBD Material Fracture” node. This node allows for excellent control in adding noise to the edges, making the fractured pieces more visually interesting.

The destruction of the hero statue has been created in #Houdini. A boolean operation is used to separate the "static" part of the statue from the "dynamic, fractured pieces" that will be simulated with the RBD solver.

The environment was Lit by Maxime Grange thanks to the new Adaptive Probe Volume (APV) in #unity3d. He created the initial lighting setup and two lighting scenarios: Day & Night.

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To better emphasize the presence of dust and smoke, I made some changes to the environment. I added a bunch of statues and layers of dust with decals to recreate the backyard of a stone carving factory.

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Orson Favrel @ofavrel.bsky.social · 28/10/2024

I guess It's time to bring some useful twitter #realtimevfx breakdown. Let's start with this one about Explosion💥 in #unity3d and #vfxgraph using 6-Way lighting technique.

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Morning☀️My Name is Orson Favrel, and I'm a VFX/Tech Artist working at #unity3d with the #vfxgraph team. In the past, I've worked as a VFX Artist at #readyatdawn and #Dontnod on games: #TheOrder1886, #RememberMe, #LifeisStrange 1 & 2, #Vampyr or #Banisher. I can't wait to discover the community. 😀

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A simple Position based VFX without velocity.

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And #Unity6 computed source code that should work without the need of Velocity.

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This is 2022 LTS version which needs a velocity

To check what going on under the hood, you can enable the “Show Additional Debug Info” in the VFX Graph preferences. This will let you see the computed source code (HLSL) when selecting a block.