Function ApplyLightingToObjects

Descent3/lighting.cpp:992–1051

Applies lighting to all objects in a certain distance

// Applies lighting to all objects in a certain distance
void ApplyLightingToObjects(vector *pos, int roomnum, float light_dist, float red_scale, float green_scale,
                            float blue_scale, vector *light_direction, float dot_range) {
  int16_t objlist[MAX_DYNAMIC_FACES];
  int num_objects, i;
  float normalized_time[MAX_SUBOBJECTS];

  num_objects = fvi_QuickDistObjectList(pos, roomnum, light_dist, objlist, MAX_DYNAMIC_FACES, false, false, true);

  for (i = 0; i < num_objects; i++) {
    object *obj = &Objects[objlist[i]];

    if (obj->type == OBJ_ROOM) {
      ApplyLightingToExternalRoom(pos, obj->id, light_dist, red_scale, green_scale, blue_scale, light_direction,
                                  dot_range);
      continue;
    }

    if (obj->renderframe != ((FrameCount - 1) % 65536)) {
      if (obj != Viewer_object)
        continue;
    }

    if (obj->lm_object.used == 0) {
      if (obj->effect_info && ((obj->effect_info->type_flags & EF_VOLUME_LIT) ||
                               obj->lighting_render_type == LRT_GOURAUD || obj->type == OBJ_POWERUP)) {
        ApplyVolumeLightToObject(pos, obj, light_dist, red_scale, green_scale, blue_scale, light_direction, dot_range);
        continue;
      } else
        continue;
    }

    int model_num = obj->rtype.pobj_info.model_num;
    poly_model *pm = &Poly_models[model_num];

    // Set our light position
    Light_position = *pos;

    // Set up light direction if this is a directional light
    if (light_direction) {
      Light_direction = *light_direction;
      Use_light_direction = 1;
    } else
      Use_light_direction = 0;

    StartLightingInstance(&obj->pos, &obj->orient);

    // Now, get the lights position in the objects submodel space
    SetNormalizedTimeObj(obj, normalized_time);
    SetModelAnglesAndPos(pm, normalized_time);

    for (int t = 0; t < pm->n_models; t++) {
      bsp_info *sm = &pm->submodel[t];
      if (sm->parent == -1)
        ApplyLightingToSubmodel(obj, pm, sm, light_dist, red_scale, green_scale, blue_scale, dot_range);
    }

    DoneLightingInstance();
    ASSERT(Light_instance_depth == 0);