Function DoRadiosityForTerrain

editor/editor_lighting.cpp:1819–2218

Calculates radiosity for the outdoor surfaces

// Calculates radiosity for the outdoor surfaces
void DoRadiosityForTerrain() {
  int i, t, raynum = 0;
  int extra_surfaces = 0, total_surfaces = 0;
  int surf_index = 0;
  spectra *terrain_sums[2];
  int room_surf_start, obj_surf_start;

  int do_dynamic = 0;
  int lit = 0;

  // First make sure there is even a light source
  for (i = 0; i < Terrain_sky.num_satellites; i++) {
    int tmap = Terrain_sky.satellite_texture[i];
    if (Terrain_sky.satellite_r[i] > 0 || Terrain_sky.satellite_g[i] > 0 || Terrain_sky.satellite_b[i] > 0)
      lit = 1;
  }

  if (!lit) {
    OutrageMessageBox("No moons/suns cast light so there is no point in running terrain radiosity!");
    return;
  }

  for (i = 0; i < Terrain_sky.num_satellites; i++) {
    TerrainLightSpeedup[i] = (uint8_t *)mem_malloc(TERRAIN_WIDTH * TERRAIN_DEPTH);
    ASSERT(TerrainLightSpeedup[i]);
  }

  if ((MessageBox(NULL,
                  "Do you wish to calculate dynamic terrain lighting when radiosity is completed? (Note: Dynamic "
                  "lighting takes a long time)",
                  "Question", MB_YESNO)) == IDYES)
    do_dynamic = 1;

  if (!Ignore_terrain)
    ComputeTerrainSpeedTable();

  extra_surfaces += Terrain_sky.num_satellites;
  extra_surfaces += GetTotalObjectFaces(1);

  // Get our external rooms ready
  ClearAllRoomLightmaps(1);
  ComputeAllRoomLightmapUVs(1);

  // count how many faces we'll need
  for (i = 0; i < MAX_ROOMS; i++) {
    if (Rooms[i].used && (Rooms[i].flags & RF_EXTERNAL))
      extra_surfaces += Rooms[i].num_faces;
  }

  if (!Ignore_terrain)
    total_surfaces = ((AREA_X) * (AREA_Z) * 2);
  total_surfaces += extra_surfaces;

  // Get our object lightmaps ready
  ClearAllObjectLightmaps(1);

  // Allocate memory
  terrain_sums[0] = (spectra *)mem_malloc(TERRAIN_WIDTH * TERRAIN_DEPTH * sizeof(spectra));