struct ANIM_STATE
{
	ANIM_KEYFRAME body;
	ANIM_KEYFRAME back_foot;
	ANIM_KEYFRAME front_foot;
	ANIM_KEYFRAME attach;
};

void anim_seq_eval(ANIM_SEQUENCE *seq, float time, ANIM_KEYFRAME *frame);
void anim_eval(ANIMATION *anim, float time, ANIM_STATE *state);
void anim_add_keyframe(ANIM_KEYFRAME *seq, ANIM_KEYFRAME *added, float amount);
void anim_add(ANIM_STATE *state, ANIM_STATE *added, float amount);
void anim_eval_add(ANIM_STATE *state, ANIMATION *anim, float time, float amount);