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Jose Moreno Profile picture
Jose Moreno
@jose_morval
Coffee, math and game lover. Senior Technical Artist at @remedygames. Prev. Alan Wake 2, Metroid Dread @mercurysteam, @sabergames, @labcave and @calendulagame.
Oct 24, 2022 • 17 tweets • 8 min read
In this thread we are going, finally, to implement Navier-Stokes simulation in Niagara. We should obtain something like in the gif below. #ue5 #niagara #vfx #gamedev #math
Following the steps in Stam's Stable Fluids paper, let's split our original problem into smaller ones. Basically, we solve the momentum equation (apply forces, advect velocity and diffuse it) and after that we force that computed velocity to be divergence-free using the pressure. Image
Oct 15, 2022 • 26 tweets • 8 min read
It's time to solve some fluid dynamics equations! These are the well-known Navier-Stokes Equations which describe the motion of a viscous fluid. #ue5 #niagara #gamedev #techart #houdini #math
Image There are three or four unknows in this system of equations, depending on whether we are in 2D or 3D case. The main unknows are: the velocity (two or three components) and the pressure.
Oct 12, 2022 • 17 tweets • 8 min read
Before getting into the fluid simulation thing we are going to talk about "programming" in a simulation stage and why do this. #ue5 #niagara
Let's suppose we have a scratch pad like the one in the first picture. As we know, this scratch pad runs for every cell in the Grid2D. But, what is it exactly "running"? Image
Oct 1, 2022 • 19 tweets • 7 min read
At the end of the last thread, we painted a moving circle in our Grid2D. Let's take a big leap transforming this circle into a simple "trace effect".
To do this, we're going to create a new Niagara system in world space that renders a single sprite, parallel to the ground, with a material that reads a texture (with the trace) created in Niagara. It's the perfect effect to learn a few things.
Sep 28, 2022 • 13 tweets • 6 min read
At the end of the first thread, we set the same value for all cells in the Grid2D. Now we are going to make something more interesting. #ue5 #niagara
(2/13) Let's create a scratch pad in the Simulation Stage. In this one, we are going to use the node "Execution Index", that assigns an integer for each cell, and set as the value of the cell. Previously, we normalize it using the dimensions of our Grid2D. Image
Sep 26, 2022 • 15 tweets • 5 min read
I'm going to write a few shorts threads for those who are starting in the wonderful world of simulation stages in #ue5 #niagara. The ultimate goal is code a (simple) fluid solver in 2D/3D that allow us, for example, driving particles by fluid simulation in a similar way as games (2/15) like Returnal or God of War does.