float const DOWNFORCE = -k_walk_downforce*VG_TIMESTEP_FIXED;
v3_muladds( phys->rb.v, (v3f){0.0f,-1.0f,0.0f}, DOWNFORCE, phys->rb.v );
float const DOWNFORCE = -k_walk_downforce*VG_TIMESTEP_FIXED;
v3_muladds( phys->rb.v, (v3f){0.0f,-1.0f,0.0f}, DOWNFORCE, phys->rb.v );