GLSL built-in function
not()
Negates every component of a boolean vector.
Demo version: GLSL ES 1.00 / WebGL 1Demo stage: Fragment
Syntax
bvec2 not(bvec2 x)
bvec3 not(bvec3 x)
bvec4 not(bvec4 x)Parameters
- x
- Input value or left-hand vector
Return value
A boolean vector of the same size, with each true changed to false and each false changed to true.
Live example
Edit the code and the preview updates as you type.
What not does
Negates every component of a boolean vector.
Read the preview
not(lessThan(vec2(x,y),vec2(0.0))).x reverses the left-half test into a right-half test. Set the lessThan bound to vec2(0.5) to move the inversion boundary right.
Core call
float(not(lessThan(vec2(x,y),vec2(0.0))).x);
Use ! for scalar logical negation; not accepts a boolean vector.
Experiment
Replace the input to not with bvec2(true,false) and keep .x. The selected first component becomes false everywhere; choosing .y instead makes it true everywhere.