tModLoader How do I use a custom Spite Sheet?

[Cream of Cheese]

I'm working on a personal mod and the town Npc I have keeps on bugging out and walking weird. I have a spritesheet but is there any way to assign certain frames to certain actions?

 

[Draymien]

Idk if this works with town NPCs but you might want to check out the flutter slime AI, specially the following:

        public override void FindFrame(int frameHeight) {
            // This makes the sprite flip horizontally in conjunction with the npc.direction.
            npc.spriteDirection = npc.direction;

            // For the most part, our animation matches up with our states.
            if (AI_State == State_Asleep) {
                // npc.frame.Y is the goto way of changing animation frames. npc.frame starts from the top left corner in pixel coordinates, so keep that in mind.
                npc.frame.Y = Frame_Asleep * frameHeight;
            }
            else if (AI_State == State_Notice) {
                // Going from Notice to Asleep makes our npc look like it's crouching to jump.
                if (AI_Timer < 10) {
                    npc.frame.Y = Frame_Notice * frameHeight;
                }
                else {
                    npc.frame.Y = Frame_Asleep * frameHeight;
                }
            }
            else if (AI_State == State_Jump) {
                npc.frame.Y = Frame_Falling * frameHeight;
            }
            else if (AI_State == State_Hover) {
                // Here we have 3 frames that we want to cycle through.
                npc.frameCounter++;
                if (npc.frameCounter < 10) {
                    npc.frame.Y = Frame_Flutter_1 * frameHeight;
                }
                else if (npc.frameCounter < 20) {
                    npc.frame.Y = Frame_Flutter_2 * frameHeight;
                }
                else if (npc.frameCounter < 30) {
                    npc.frame.Y = Frame_Flutter_3 * frameHeight;
                }
                else {
                    npc.frameCounter = 0;
                }
            }
            else if (AI_State == State_Fall) {
                npc.frame.Y = Frame_Falling * frameHeight;
            }
        }

Ofc you would have to add a few numbers, since the standard npc has around 26 sprites.