Best way to detect if vec3 is between vec3(x) and vec3(y) in glsl

Question

As titled

I am sampling from a texture and if the color is somehow gray [vec3(.8), vec3(.9)] and an uniform is 1 I need to substitute that color with another one

I am not a glsl veteran but I am pretty sure there is a more elegant and compact (without mentioning faster) way than this:

vec3 textureColor = texture(texture0, oUV);

if(settings.w == 1 && textureColor.r > .8 && textureColor.r < .9
                    && textureColor.g > .8 && textureColor.g < .9
                    && textureColor.b > .8 && textureColor.b < .9)

Kromster · Accepted Answer · 2014-08-21 08:57:35Z

1

How about:

vec3 delta = abs(textureColor - vec3(0.85, 0.85, 0.85)); // Get delta from middle vec3

if (delta.r <= 0.05) && (delta.g <= 0.05) && (delta.b <= 0.05)

Performance needs to be profiled, but it's sure shorter to write

answered Aug 21, 2014 at 8:57

Kromster

10.7k4 gold badges55 silver badges67 bronze badges

\$\begingroup\$ Sounds nice, +1, lets give just sometime to see if someone shows up with a better one, otherwise I will accept your :) \$\endgroup\$

elect
– elect

2014-08-21 09:01:52 +00:00
Commented Aug 21, 2014 at 9:01

Add a comment |

Laszlo Fuleki · Accepted Answer · 2014-08-21 16:19:13Z

1

You can use the inbuilt GLSL lessThan() and greaterThan() functions (supported in all GLSL versions). These give two boolean vectors as a result.

https://www.opengl.org/sdk/docs/man/html/greaterThan.xhtml http://www.opengl.org/sdk/docs/man4/html/lessThan.xhtml

Then, you can use 'equal' (https://www.opengl.org/sdk/docs/man/html/equal.xhtml) on those results.

I would still do the first version though, even if its a bit more code, its perfectly understandable. :)

answered Aug 21, 2014 at 16:19

Laszlo Fuleki

1564 bronze badges

\$\begingroup\$ I toke the other one since I like it more, anyway thanks for your suggest, +1 \$\endgroup\$

elect
– elect

2014-08-25 13:23:35 +00:00
Commented Aug 25, 2014 at 13:23

Add a comment |

Stack Exchange Network

Best way to detect if vec3 is between vec3(x) and vec3(y) in glsl

2 Answers 2

You must log in to answer this question.

Hot Network Questions

Best way to detect if vec3 is between vec3(x) and vec3(y) in glsl

2 Answers 2

You must log in to answer this question.

Related

Hot Network Questions