Hiya Brad
Would you do me a favor please?  I want to put this shadertoy shader on a skybox
https://www.shadertoy.com/view/MllXz4
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https://www.shadertoy.com/media/shaders/MllXz4.jpg
I'm trying to follow the instructions on the forum for converting shadertoy shaders to work with skyboxes but i'm having no luck
here's the current state of it:
http://hifi-content.s3.amazonaws.com/caitlyn/scratch/trippy2.fs
Can you see what I might be doing wrong and help me out?

Austin [9:21 AM]
so typically you want to start in shadertoy with a sort of equivalent to a skybox....
I have a small shader that does this.... take a look at https://www.shadertoy.com/view/lsdfW8

notice that you can use the mouse to pan around and that the image is ultimately defined in terms of the direction `d`
the most basic form of this would be:

mat3 rot(vec3 a, float b) {
    a = normalize(a);
    float s = sin(b);
    float c = cos(b);
    float d = 1.0 - c;
    return mat3(d * a.x * a.x + c, d * a.x * a.y - a.z * s, d * a.z * a.x + a.y * s, d * a.x * a.y + a.z * s, d * a.y * a.y + c,
                d * a.y * a.z - a.x * s, d * a.z * a.x - a.y * s, d * a.y * a.z + a.x * s, d * a.z * a.z + c);
}

float e = 2.3, p = atan(1.) * 4.;

vec3 getPixelDirection(in vec2 fragCoord) {
    vec2 R = iResolution.xy, u = fragCoord / R;
    vec4 m = iMouse / R.xyxx;
    mat3 rmx = rot(vec3(0, 1, 0), clamp(-m.w * R.x, 0., 1.) * 3.14 / 10. + m.x * p * 2.);
    rmx *= rot(cross(vec3(0, 1, 0), vec3(0, 0, 1) * rmx), m.y * p - p / 2.);
    vec3 d = normalize(vec3((u * 2. - 1.) * vec2(iResolution.x / iResolution.y, 1), 1)) * rmx;
    return d;
}


void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    vec3 d = getPixelDirection(fragCoord);
    fragColor = vec4(d, 1.0);    
}

if you make a shader with that, you can get a basic colorbox

if you define a function `vec3 getOutput(vec3 d)` you can replace the last line above with `fragColor = vec4(getOutput(d), 1.0);` and start fiddling with the implementation of `getOutput`
now the shader you've provided is designed for 2D display.... ultimately all the real interesting logic is in `myoutput` it takes the fragCoord, converts it to a uv coord and then uses that to populate two values, dist and angle
dist and angle are the actual inputs to the rest of the function. so i can dump the beginning of `myoutput` and replace it with this...

vec4 myoutput( vec2 spherical )
{
    float dist = spherical.y;
    float angle = spherical.x;
}

now I just have to write my `getOutput` function to produce the spherical coordinates

https://www.shadertoy.com/view/MsdBD7


To adapt that to our system, you'd want a function that looks like this....

vec3 getSkyboxColor()
{
    return getOutput(normalize(_normal));
}

Change `iTime` to `iGlobalTime`

Put #define iTime iGlobalTime at the top of your file.