Chris Rorden neurolabusc

## ubo-tutorial.html
<!--
Go to Line 153 for the start of Uniform Buffer Object related code and intro

Prerequsite:

You at least know what uniforms are in the context of WebGL
and mininally understand the concepts involved in creating a square in WebGL
-->

<html>

## Notes.md

      
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                mhamilt
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              February 19, 2023 20:17
            
              
                Metal Compute Shader Example in Swift and Objective C
              
          
    Notes

Create a command line target in xcode either in Swift or Obj-C. add a metal file to the project and copy and paste the respective code into each file.

  
## intersectAABB.glsl
// adapted from intersectCube in https://github.com/evanw/webgl-path-tracing/blob/master/webgl-path-tracing.js

// compute the near and far intersections of the cube (stored in the x and y components) using the slab method
// no intersection means vec.x > vec.y (really tNear > tFar)
vec2 intersectAABB(vec3 rayOrigin, vec3 rayDir, vec3 boxMin, vec3 boxMax) {
    vec3 tMin = (boxMin - rayOrigin) / rayDir;
    vec3 tMax = (boxMax - rayOrigin) / rayDir;
    vec3 t1 = min(tMin, tMax);
    vec3 t2 = max(tMin, tMax);
    float tNear = max(max(t1.x, t1.y), t1.z);

## osx_setup.sh
#!/usr/bin/env bash

# ~/.osx — http://mths.be/osx

# Ask for the administrator password upfront
sudo -v

# Keep-alive: update existing `sudo` time stamp until `.osx` has finished
while true; do sudo -n true; sleep 60; kill -0 "$$" || exit; done 2>/dev/null &
	<!--
	Go to Line 153 for the start of Uniform Buffer Object related code and intro

	Prerequsite:

	You at least know what uniforms are in the context of WebGL
	and mininally understand the concepts involved in creating a square in WebGL
	-->

	<html>
	// adapted from intersectCube in https://github.com/evanw/webgl-path-tracing/blob/master/webgl-path-tracing.js

	// compute the near and far intersections of the cube (stored in the x and y components) using the slab method
	// no intersection means vec.x > vec.y (really tNear > tFar)
	vec2 intersectAABB(vec3 rayOrigin, vec3 rayDir, vec3 boxMin, vec3 boxMax) {
	vec3 tMin = (boxMin - rayOrigin) / rayDir;
	vec3 tMax = (boxMax - rayOrigin) / rayDir;
	vec3 t1 = min(tMin, tMax);
	vec3 t2 = max(tMin, tMax);
	float tNear = max(max(t1.x, t1.y), t1.z);
	#!/usr/bin/env bash

	# ~/.osx — http://mths.be/osx

	# Ask for the administrator password upfront
	sudo -v

	# Keep-alive: update existing `sudo` time stamp until `.osx` has finished
	while true; do sudo -n true; sleep 60; kill -0 "$$" \|\| exit; done 2>/dev/null &