Step function (HLSL)

 step(edge,x)

 

this will return 1 if the 2nd argument (x) is greater or equal to  the first (edge). 0 is returned if this is false.

Comments

Post a Comment

Popular posts from this blog

compute shader with skinned mesh flocking instances

This is v. similar to the previous flocking post, only now we use a skinned & animated mesh & it's attached Animator component. Something to note, one instance of the prefab has to be in the scene, or it doesn't work (move it off camera or something). Also - the material that uses the surface shader , must have the GPU instancing enabled! That's what those if-checks are for! The gist of this is - we need to store the vertex animation into another buffer. The compute shader doesn't deal with this data at all - it is only concerned with the position/direction of each instance. It is the surface/vert-frag shader that will deal with it. The only bit the compute shader does increment is the "frame" of animation, which is determined by the speed at which the boid is moving.    C# SCRIPT using System.Collections; using System.Collections.Generic; using UnityEngine; public class SkinnedFlocking : MonoBehaviour {     public struct Boid     {  ...
Read more

Unity's "new" input system and Keijiro's Minis midi stuff

Image
Many of you might be used to using the old Klak/MidiJack libraries for midi input into Unity, however they're getting a little long in the tooth now & Unity has changed up its input system to supposedly be more flexible & modern. The new midi input library is called Minis, I'm pretty sure it's short for Midi New Input System.. but that doesn't really matter :D There isn't a whole lot of easy-to-understand documentation on how to use it in scripts, so I thought I'd share what I'd figured out through digging around Keijiro's example files. I'm kind of assuming you know how to use the Input Action menu - as it would seem you don't even need it, for the method I'm about to show you... In any case if you do setup some midi inputs there (or indeed any other kinds of inputs - and it seems like you can only setup simple single note button presses there? - you would use code resembling this (following) to trigger things functions as you would ...
Read more

random number generation, noise and fbm, glsl

I should really change the name of this blog to Shader Shit.... anyway.. I'll get back to Unity specific crap one day. The following code is all for GLSL & will need adapting for use in a Unity fragment shader. I like to use Kodelife to test out my shader ideas. Look it up & give it some support if you like it! This post is about fake randomness, learnt from The Book of Shaders & The Art of Coding, on the website & youtube channel respectively. Within your main GLSL function, you might need to create a random value, often just a float value (remember you can make a vector from multiple floats). A great thing to feed such a random number generating function is your UV value. Here's an example- float random(vec2 uv){ return fract(sin(dot(uv,vec2(52.2957001,2355.957250024))*574.9829619)); } What we're doing here is getting the dot product of our UV coordinate, with an arbitrary vector that consists of large numbers with plenty of "complex" fractiona l...
Read more