Function SetModelInterpPos

model/polymodel.cpp:2534–2584

Given a model pointer and an array of floats that go from 0..1, calculate the interpolated position of each corresponding subobject

// Given a model pointer and an array of floats that go from 0..1, calculate the interpolated
// position of each corresponding subobject
void SetModelInterpPos(poly_model *po, const float *normalized_pos) {
  int i;

  ASSERT(!(po->flags & PMF_NOT_RESIDENT));

  if (normalized_pos && po->num_key_pos > 0) {
    for (i = 0; i < po->n_models; i++) {
      bsp_info *sm = &po->submodel[i];

      // get time per keyframe state
      float state_time = 1.0 / (po->num_key_pos - 1);
      float cur_state_time;
      int cur_state;
      float normal_state_time;

      // Find out which keyframe we're at
      cur_state = normalized_pos[i] / state_time;

      // Find out how far into that keyframe we are
      cur_state_time = normalized_pos[i] - ((float)cur_state * state_time);
      normal_state_time = cur_state_time / state_time;

      // Now do a parametric adjustment on the positions

      vector total_delta_pos = {0, 0, 0};
      vector subpos;
      vector final_pos;

      // If we're already at the high point of the interpolation then just
      // stuff some values
      if (cur_state == sm->num_key_pos - 1) {
        po->submodel[i].mod_pos = po->submodel[i].keyframe_pos[po->num_key_pos - 1];
        continue;
      }

      if (cur_state == 0)
        po->submodel[i].mod_pos = normal_state_time * po->submodel[i].keyframe_pos[1];
      else {
        vm_SubVectors(&subpos, &po->submodel[i].keyframe_pos[cur_state + 1], &po->submodel[i].keyframe_pos[cur_state]);
        final_pos = po->submodel[i].keyframe_pos[cur_state] + (subpos * normal_state_time);
        po->submodel[i].mod_pos = final_pos;
      }
    }
  } else {
    for (i = 0; i < po->n_models; i++) {
      po->submodel[i].mod_pos.x = 0;
      po->submodel[i].mod_pos.y = 0;
      po->submodel[i].mod_pos.z = 0;
    }
  }
}

// Sets the effect used by a polymodel
void SetPolymodelEffect(polymodel_effect *poly_effect) { Polymodel_effect = *poly_effect; }