pyalot’s gists

pyalot / ssto.json

Created July 9, 2024 17:05

This file has been truncated, but you can view the full file.

pyalot / octahedral.shader

Last active January 25, 2025 08:06

octahedral mapping

	#define sectorize(value) step(0.0, (value))*2.0-1.0
	#define sum(value) dot(clamp((value), 1.0, 1.0), (value))
	#define PI 3.141592653589793

	vec2 normalToUvRectOct(vec3 normal){
	normal /= sum(abs(normal));
	if(normal.y > 0.0){
	return normal.xz*0.5+0.5;
	}
	else{

pyalot / gist:05f5007b6826342621a8

Created April 2, 2015 08:34

state assembly test

	createState: (framebuffer, code) ->
	@fw.state
	cull: 'back'
	shader: [
	fs.open('/pbr-tools.shader')
	fs.open('tools.shader')
	"""essl
	fragment:
	void main(){
	#{code}

pyalot / gist:a6f3f3bf1921339ac842

Created March 27, 2015 20:41

simple physically inspired shading function

	vec3 shade(vec3 color, float roughness, float metallness){
	float fresnelFactor = 0.93;
	float specularFactor = 0.65;

	vec3 normal = normalize(vNormal);
	vec3 eyeDir = getEyeDir();

	vec3 N = normal;
	vec3 V = -eyeDir;
	vec3 reflected = reflect(eyeDir, normal);

pyalot / gist:123e0ebe5de3969f943c

Created March 26, 2015 21:32

environment prefiltering

	float lambertNDF(vec3 normal, vec3 dir, float roughness){
	float exponent = getLambertExponent(roughnessPI0.5);
	float lambert = max(0.0, dot(normal, dir));
	return pow(lambert, exponent);
	}


	float ggxNDF(vec3 normal, vec3 dir, float roughness){
	float a = roughness*roughness;
	float d = max(0.000001, dot(normal, dir));

pyalot / checker-sphere.glsl

Created March 3, 2015 13:28

anti-aliased checker-sphere procedural glsl pattern

	float checkerSphere(){
	vec3 normal = normalize(vNormal);
	float c = (acos(normal.y)/PI)*20.0;
	float dc = fwidth(c);
	c = mod(c, 2.0);
	c = smoothstep(0.5-dc, 0.5+dc, c) - smoothstep(1.5-dc, 1.5+dc, c);

	vec2 dir = normalize(normal.xz);
	float t = (atan(dir.x, dir.y)/TAU)*40.0;
	float dt = fwidth(t);

pyalot / 16-byte packing GLSL

Last active August 29, 2015 14:11

	vec2 pack16(float value){
	float f = clamp(value, 0.0, 1.0)*255.0;
	float digitLow = fract(f);
	float digitHigh = floor(f)/255.0;
	return vec2(digitHigh, digitLow);
	}

	float unpack16(vec2 value){
	return value.x+value.y/255.0;
	}

pyalot / client-side.coffee

Last active December 24, 2015 09:18

ESSL shader error instrumentation

pyalot / gist:6474434

Last active December 22, 2015 12:48

ubuntu 13.04 install script for gtx-780 and cyborg rat9 mouse

	## create backup of home! ##

	## part 1 before reboot, update system ##
	apt-get update
	apt-get upgrade
	shutdown -r now

	## part 2 after first reboot install nvidia driver that works ##
	apt-add-repository ppa:ubuntu-x-swat/x-updates
	apt-get update

pyalot / countFiles

Created August 24, 2013 06:37

Counts all files in the current directory recursively for each contained directory and outputs the count and directory name sorted numerically.

Florian Bösch pyalot