Inside out MandalayBox

3dickulus

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Posts: 1558

Inside out MandalayBox

« on: May 31, 2015, 09:19:33 PM »

Modified MandalayBox.frag, looking for colors found another dimension of complexity

Code:

// coordinate to invert to infinity
uniform vec3 InvertC; slider[(-5,-5,-5),(0,0,0),(5,5,5)]

// Roqen's domain mashup performs the active c = T(s)
vec3 domainMap(vec3 c)
{
  float s = dot(c,c);
  return c/s * InvertC;
}

float DE(vec3 p) {
   // first line
   p = InvertC ? domainMap(-p) : p;

   // the rest of the DE() function
}

<a href="http://vimeo.com/moogaloop.swf?clip_id=129356171" target="_blank">http://vimeo.com/moogaloop.swf?clip_id=129356171</a>
and this is zoomed into the round part of the surface at the first pause in morphing, that's where it's inside out I think wink

http://www.fractalforums.com/index.php?action=gallery;sa=view;id=17854 for the full 3840x2160 version


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visual.bermarte

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Posts: 355

Re: Inside out MandalayBox

« Reply #1 on: June 01, 2015, 02:56:41 AM »

Nice, shouldn't be

Code:

uniform bool Invert; checkbox[false]

and then

Code:

p=(Invert ? domainMap(-p) : p);


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3dickulus

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Posts: 1558

Re: Inside out MandalayBox

« Reply #2 on: June 01, 2015, 06:52:49 AM »

yes, that works, as does...

Code:

p=(InvertC != vec3(0,0,0)) ? domainMap(-p) : p);

but they seem to look/act a little differently, as it is, it gets cast to bvec3
not being a mathmatician myself, I couldn't tell you if it should or shouldn't be something else, there are probably better ways, but it gets a look that I like and plan to explore


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visual.bermarte

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Posts: 355

Re: Inside out MandalayBox

« Reply #3 on: June 01, 2015, 02:21:37 PM »

Macs are more picky hurt

with

Code:

p = InvertC ? domainMap(-p) : p;

I get

Code:

Error: Condition must be of type bool


« Last Edit: June 01, 2015, 03:15:44 PM by visual.bermarte »	Logged

3dickulus

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Fractal Senior

Posts: 1558

Re: Inside out MandalayBox

« Reply #4 on: June 01, 2015, 03:26:39 PM »

hmmm... I get...

Code:

Fragment shader compiled with warnings: Fragment info
-------------
0(1166) : warning C7509: OpenGL requires the selection first expression to be a scalar boolean
0(1166) : warning C7011: implicit cast from "vec3" to "bvec3"

Compiled script in 85 ms.

just warning, no error, so it's a 3 way bool opperation that acts a bit different than a single bool switch?


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Syntopia

Fractal Molossus

Posts: 681

Re: Inside out MandalayBox

« Reply #5 on: June 01, 2015, 05:07:44 PM »

I was also quite puzzled about this. The standard says that: "The ternary selection operator (?

. It operates on three expressions (exp1 ? exp2 : exp3). This
operator evaluates the first expression, which must result in a scalar Boolean. ", so I don't think there is a 3-way ternary operator.

Your image looks great. Would you mind posting the entire DE?


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3dickulus

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Posts: 1558

Re: Inside out MandalayBox

« Reply #6 on: June 02, 2015, 04:47:57 AM »

I'm not sure exactly how it gets handled internally by the compiler (although I should have a look at the asm dump) but...
using a single bool flag for deciding to do the operation or not,
using vec3(0,0,0) or
using cast to bvec3 (implemented by compiler with warning)

the first 2 produce the same result undecided

while bvec3 does not seem to have this effect

the settings are identical for the pics except for the (single) bool being switched, I think that when using bVec3 transitioning through 0 it either never exactly hits 0 or when @0 it switches out the distortion from the domainMap() function, but when using a bool flag it's on through 0... does that make sense?
my understanding is that when casting to bool from float in GLSL 0 == false and anything else, + or -, == true

I believe you are correct re:3-way ternary operator embarrass

The DE is MandelayBox.frag as provided by knighty using the mod described above (attached), no other changes
using support files 3DKn-1.0.1.frag BufferShader-1.0.1.frag DE-Kn2.frag MathUtils.frag

singleflagOn.jpg (19.82 KB, 405x236 - viewed 188 times.) singleflagOff.jpg (45.45 KB, 405x236 - viewed 210 times.) InsideOutDetail.frag (4.78 KB - downloaded 98 times.)
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3dickulus

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Posts: 1558

Re: Inside out MandalayBox

« Reply #7 on: June 02, 2015, 05:59:58 AM »

my assumptions about GLSL booleans...

A == B ? C = A : C = B

using vec3 would go something like this...

A.x == B.x ? C.x = A.x : C.x = B.x
A.y == B.y ? C.y = A.y : C.y = B.y
A.z == B.z ? C.z = A.z : C.z = B.z

which is a very easy thing for GPU to do

the error is only generated when InvertC (float vec3) is tested by itself against true/false (bool single), when tested against another vec3 there is no error reported, hence my assumption

edit: I think that the compiler should cast the single bool to match the type required before the test without complaining because vec3(0) is valid


« Last Edit: June 02, 2015, 07:49:10 AM by 3dickulus, Reason: thoughts »	Logged

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