Active fabrics, garments, and materials

A fabric comprising:

• a first plurality of filaments, each of the first plurality of filaments comprising a passive material;
• and
• a second plurality of heterogeneous filaments, each of the second plurality of heterogeneous filaments comprising an active material, wherein the second plurality of heterogeneous filaments are additively manufactured;
• wherein the first plurality of filaments are arranged in a knit pattern with each of the second plurality of filaments, and wherein the active material is a material that undergoes a phase transition at a predetermined temperature to generate a change in the fabric between a relaxed state and an activated state characterized by an actuation contraction of the knit pattern at least partially based upon a knit index, and wherein a second active material and the passive material are both components of the first plurality of filaments,
• and wherein one or more filaments of the second plurality of filaments include a sharp transition.

A fabric comprising:

• a first portion made of a first material and extending across a first plurality of rows of continuous filaments, each of the first plurality of rows of continuous filaments arranged in a pattern of loops;
• and
• a second portion made of a second material and extending across a second plurality of rows of continuous filaments, each of the second plurality of rows of continuous filaments arranged in the pattern of loops;
• wherein at least one filament of the first plurality of rows of continuous filaments is also a filament of the second plurality of rows of continuous filaments, and the at least one filament includes a plurality of segments each made of a different material from adjacent ones of the plurality of segments, and
• wherein the plurality of segments vary from one another according to an attribute selected from the group consisting of:
• electrically-active, mechanically-active, and thermally-active features.