perform a component-wise less-than comparison of two vectors
bvec2 lessThan(ivec2 x, ivec2 y)bvec3 lessThan(ivec3 x, ivec3 y)bvec4 lessThan(ivec4 x, ivec4 y)bvec2 lessThan(vec2 x, vec2 y)bvec3 lessThan(vec3 x, vec3 y)bvec4 lessThan(vec4 x, vec4 y)x: Specifies the first vector to be used in the comparison operation.y: Specifies the second vector to be used in the comparison operation.lessThan returns a boolean vector in which each element i is computed as x[i] < y[i].