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changeset 2318:133882370e83

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far_clip and near_clip for draw terrain
author Ritor1
date Thu, 20 Mar 2014 17:38:29 +0600
parents 345b1ff000bb
children 9987f93d7e1f
files Indoor.cpp Render.cpp
diffstat 2 files changed, 161 insertions(+), 112 deletions(-) [+]
line wrap: on
line diff
--- a/Indoor.cpp	Thu Mar 20 09:13:42 2014 +0600
+++ b/Indoor.cpp	Thu Mar 20 17:38:29 2014 +0600
@@ -5507,16 +5507,16 @@
     for ( uint i = 1; i <= pFace->uNumVertices; ++i)
     {
       next_vertices_flag = PortalFace._view_transformed_z[i + 3] >= 0x80000; //524288;// 8.0
-      if ( current_vertices_flag ^ next_vertices_flag )//или текущая или следующая вершина за ближней границей
+      if ( current_vertices_flag ^ next_vertices_flag )//или текущая или следующая вершина за ближней границей - v5
       {
         if ( next_vertices_flag )//следующая вершина за ближней границей
         {
-          //t = near_clip - v0.z / v1.z - v0.z
+          //t = near_clip - v4.z / v5.z - v4.z
           t = fixpoint_div(0x80000 - PortalFace._view_transformed_z[i + 2], PortalFace._view_transformed_z[i + 3] - PortalFace._view_transformed_z[i + 2]);
-          //New_x = (v1.x - v0.x)*t + v0.x
+          //New_x = (v5.x - v4.x)*t + v4.x
           PortalFace._view_transformed_x[depth_num_vertices] = fixpoint_mul((PortalFace._view_transformed_x[i + 3] - PortalFace._view_transformed_x[i + 2]), t) 
                                                                + PortalFace._view_transformed_x[i + 2];
-          //New_y = (v1.y - v0.y)*t + v0.y
+          //New_y = (v5.y - v4.y)*t + v4.y
           PortalFace._view_transformed_y[depth_num_vertices] = fixpoint_mul((PortalFace._view_transformed_y[i + 3] - PortalFace._view_transformed_y[i + 2]), t)
                                                                + PortalFace._view_transformed_y[i + 2];
           //New_z = 8.0(0x80000)
--- a/Render.cpp	Thu Mar 20 09:13:42 2014 +0600
+++ b/Render.cpp	Thu Mar 20 17:38:29 2014 +0600
@@ -263,8 +263,8 @@
       pGame->pIndoorCameraD3D->Project(&pTerrainVertices[z * 128 + x], 1, 0);
     }
   }
-//--------------------------------------------------------------------------------------------------------------------
-  int direction = pGame->pIndoorCameraD3D->sRotationY / 256;//direction of the camera(напрвление камеры), не могу округлить :(
+//-------(Отсечение невидимой части карты)------------------------------------------------------------------------------------------
+  float direction = pGame->pIndoorCameraD3D->sRotationY / 256;//direction of the camera(напрвление камеры)
   //0-East(B)
   //1-NorthEast(CB)
   //2-North(C)
@@ -274,42 +274,30 @@
   //6-South(Ю)
   //7-SouthEast(ЮВ)
   int Start_X, End_X, Start_Z, End_Z;
-  switch ( direction )
-  {
-    case 0://East(B)
-      Start_X = pODMRenderParams->uMapGridCellX, End_X = 127;
-      Start_Z = 0, End_Z = 127;
-      break;
-    case 1://NorthEast(CB)
-      Start_X = 0,/*pODMRenderParams->uMapGridCellX - 1,*/ End_X = 127;
-      Start_Z = 0, End_Z = pODMRenderParams->uMapGridCellZ;
-      break;
-    case 2://North(C)
+  if ( direction >= 0 && direction < 1.0 )//East(B) - NorthEast(CB)
+  {
+    Start_X = pODMRenderParams->uMapGridCellX, End_X = 127;
+    Start_Z = 0, End_Z = 127;
+  }
+  else if (direction >= 1.0 && direction < 3.0)//NorthEast(CB) - WestNorth(CЗ)
+  {
       Start_X = 0, End_X = 127;
       Start_Z = 0, End_Z = pODMRenderParams->uMapGridCellZ;
-      break;
-    case 3://WestNorth(CЗ)
-      Start_X = 0, End_X = pODMRenderParams->uMapGridCellX + 1;
-      Start_Z = 0, End_Z = 127;//pODMRenderParams->uMapGridCellZ + 2;
-      break;
-    case 4://West(З)
-      Start_X = 0, End_X = pODMRenderParams->uMapGridCellX + 1;
-      Start_Z = 0, End_Z = 127;
-      break;
-    case 5://SouthWest(ЮЗ)
-      Start_X = 0, End_X = 127;//pODMRenderParams->uMapGridCellX + 2;
-      Start_Z = pODMRenderParams->uMapGridCellZ - 1, End_Z = 127;
-      break;
-    case 6://South(Ю)
-      Start_X = 0, End_X = 127;
-      Start_Z = pODMRenderParams->uMapGridCellZ - 1, End_Z = 127;
-      break;
-    case 7://SouthEast(ЮВ)
-      Start_X = pODMRenderParams->uMapGridCellX, End_X = 127;
-      Start_Z = 0,/*pODMRenderParams->uMapGridCellZ,*/ End_Z = 127;
-      break;
-    default:
-      __debugbreak();//Ritor1: error
+  }
+  else if (direction >= 3.0 && direction < 5.0)//WestNorth(CЗ) - SouthWest(ЮЗ)
+  {
+    Start_X = 0, End_X = pODMRenderParams->uMapGridCellX + 1;
+    Start_Z = 0, End_Z = 127;
+  }
+  else if ( direction >= 5.0 && direction < 7.0 )//SouthWest(ЮЗ) - //SouthEast(ЮВ)
+  {
+    Start_X = 0, End_X = 127;
+    Start_Z = pODMRenderParams->uMapGridCellZ - 1, End_Z = 127;
+  }
+  else//SouthEast(ЮВ) - East(B)
+  {
+    Start_X = pODMRenderParams->uMapGridCellX, End_X = 127;
+    Start_Z = 0, End_Z = 127;
   }
   for (unsigned int z = Start_Z; z < End_Z; ++z)
   {
@@ -371,8 +359,8 @@
         norm = 0;
       else
         norm = &pTerrainNormals[norm_idx];
-      //pGame->pLightmapBuilder->StackLights_TerrainFace(norm, &a3a, array_50AC10, 4, 1);//Ritor1: slows
-      //pDecalBuilder->_49BE8A(pTilePolygon, norm, &a3a, array_50AC10, 4, 1);
+      pGame->pLightmapBuilder->StackLights_TerrainFace(norm, &a3a, array_50AC10, 4, 1);//Ritor1: slows
+      pDecalBuilder->_49BE8A(pTilePolygon, norm, &a3a, array_50AC10, 4, 1);
 //-----------------------------------------------------------------------------------------------
 
       ++pODMRenderParams->uNumPolygons;
@@ -387,6 +375,31 @@
         memcpy(&array_50AC10[k], &array_73D150[k], sizeof(struct RenderVertexSoft));
         array_50AC10[k]._rhw = 1.0 / (array_73D150[k].vWorldViewPosition.x + 0.0000001000000011686097);
       }
+//---------Draw distance(Дальность отрисовки)-------------------------------
+      pODMRenderParams->shading_dist_mist = 0x5000;
+      bool neer_clip = array_73D150[0].vWorldViewPosition.x < 8.0
+                    || array_73D150[1].vWorldViewPosition.x < 8.0
+                    || array_73D150[2].vWorldViewPosition.x < 8.0
+                    || array_73D150[3].vWorldViewPosition.x < 8.0;
+      bool far_clip = (double)pODMRenderParams->shading_dist_mist < array_73D150[0].vWorldViewPosition.x
+                   || (double)pODMRenderParams->shading_dist_mist < array_73D150[1].vWorldViewPosition.x
+                   || (double)pODMRenderParams->shading_dist_mist < array_73D150[2].vWorldViewPosition.x
+                   || (double)pODMRenderParams->shading_dist_mist < array_73D150[3].vWorldViewPosition.x;
+      if ( !byte_4D864C || ~pGame->uFlags & 0x80 )
+      {
+        if ( neer_clip )
+        {
+          pTilePolygon->uNumVertices = ODM_NearClip(pTilePolygon->uNumVertices);
+          //ODM_Project(pTilePolygon->uNumVertices);
+        }
+        if ( far_clip )
+        {
+
+          pTilePolygon->uNumVertices = ODM_FarClip(pTilePolygon->uNumVertices);
+          //ODM_Project(pTilePolygon->uNumVertices);
+        }
+      }
+      pODMRenderParams->shading_dist_mist = 0x2000;
 
 // check the transparency and texture (tiles) mapping (проверка прозрачности и наложение текстур (тайлов))----------------------
       bool transparent = false;
@@ -8511,48 +8524,51 @@
   bool current_vertices_flag; // edi@1
   bool next_vertices_flag; // [sp+Ch] [bp-24h]@6
   double t; // st6@10
-  int pNextVertices;
+  //int pNextVertices;
 
   if (!num_vertices)
     return 0;
 
-  memcpy(&array_50AC10[num_vertices], array_50AC10, sizeof(array_50AC10[0]));
-  current_vertices_flag = 0;
-  if ( array_50AC10[0].vWorldViewPosition.x >= 8.0 )
-    current_vertices_flag = 1;
+  memcpy(&array_50AC10[num_vertices], &array_50AC10[0], sizeof(array_50AC10[0]));
+  current_vertices_flag = false;
+  next_vertices_flag = false;
+  if ( array_50AC10[0].vWorldViewPosition.x <= 8.0 )
+    current_vertices_flag = true;
 
   int out_num_vertices = 0;
   for (int i = 0; i < num_vertices; ++i)
   {
-    next_vertices_flag = array_50AC10[i + 1].vWorldViewPosition.x >= 8.0;
-    if ( current_vertices_flag != next_vertices_flag )
-    {
-      if ( next_vertices_flag )
+    next_vertices_flag = array_50AC10[i + 1].vWorldViewPosition.x <= 8.0;//
+    if ( current_vertices_flag ^ next_vertices_flag )
+    {
+      if ( next_vertices_flag )//следующая вершина за ближней границей
       {
         //t = near_clip - v0.x / v1.x - v0.x    (формула получения точки пересечения отрезка с плоскостью)
         t = (8.0 - array_50AC10[i].vWorldViewPosition.x) / (array_50AC10[i + 1].vWorldViewPosition.x - array_50AC10[i].vWorldViewPosition.x);
-        array_507D30[out_num_vertices].vWorldViewPosition.y = (array_50AC10[i + 1].vWorldViewPosition.y - array_50AC10[i].vWorldViewPosition.y) * t + array_50AC10[i].vWorldViewPosition.y;
-        array_507D30[out_num_vertices].vWorldViewPosition.z = (array_50AC10[i + 1].vWorldViewPosition.z - array_50AC10[i].vWorldViewPosition.z) * t + array_50AC10[i].vWorldViewPosition.z;
-        array_507D30[out_num_vertices].u = (array_50AC10[i + 1].u - array_50AC10[i].u) * t + array_50AC10[i].u;
-        array_507D30[out_num_vertices].v = (array_50AC10[i + 1].v - array_50AC10[i].v) * t + array_50AC10[i].v;
-      }
-      else
-      {
-        t = (8.0 - array_50AC10[i + 1].vWorldViewPosition.x) / (array_50AC10[i].vWorldViewPosition.x - array_50AC10[i + 1].vWorldViewPosition.x);
-        array_507D30[out_num_vertices].vWorldViewPosition.y = (array_50AC10[i].vWorldViewPosition.y - array_50AC10[i + 1].vWorldViewPosition.y) * t + array_50AC10[i + 1].vWorldViewPosition.y;
-        array_507D30[out_num_vertices].vWorldViewPosition.z = (array_50AC10[i].vWorldViewPosition.z - array_50AC10[i + 1].vWorldViewPosition.z) * t + array_50AC10[i + 1].vWorldViewPosition.z;
-        array_507D30[out_num_vertices].u = (array_50AC10[i].u - array_50AC10[i + 1].u) * t + array_50AC10[i + 1].u;
-        array_507D30[out_num_vertices].v = (array_50AC10[i].v - array_50AC10[i + 1].v) * t + array_50AC10[i + 1].v;
-      }
-      array_507D30[out_num_vertices].vWorldViewPosition.x = 8.0;
-      array_507D30[out_num_vertices]._rhw = 1.0 / 8.0;
+        array_507D30[out_num_vertices].vWorldViewPosition.x = 8.0;
+        array_507D30[out_num_vertices].vWorldViewPosition.y = array_50AC10[i].vWorldViewPosition.y + (array_50AC10[i + 1].vWorldViewPosition.y - array_50AC10[i].vWorldViewPosition.y) * t;
+        array_507D30[out_num_vertices].vWorldViewPosition.z = array_50AC10[i].vWorldViewPosition.z + (array_50AC10[i + 1].vWorldViewPosition.z - array_50AC10[i].vWorldViewPosition.z) * t;
+        array_507D30[out_num_vertices].u = array_50AC10[i].u + (array_50AC10[i + 1].u - array_50AC10[i].u) * t;
+        array_507D30[out_num_vertices].v = array_50AC10[i].v + (array_50AC10[i + 1].v - array_50AC10[i].v) * t;
+        array_507D30[out_num_vertices]._rhw = 1.0 / 8.0;
+      }
+      else// текущая вершина за ближней границей
+      {
+        t = (8.0 - array_50AC10[i].vWorldViewPosition.x) / (array_50AC10[i].vWorldViewPosition.x - array_50AC10[i + 1].vWorldViewPosition.x);
+        array_507D30[out_num_vertices].vWorldViewPosition.x = 8.0;
+        array_507D30[out_num_vertices].vWorldViewPosition.y = array_50AC10[i].vWorldViewPosition.y + (array_50AC10[i].vWorldViewPosition.y - array_50AC10[i + 1].vWorldViewPosition.y) * t;
+        array_507D30[out_num_vertices].vWorldViewPosition.z = array_50AC10[i].vWorldViewPosition.z + (array_50AC10[i].vWorldViewPosition.z - array_50AC10[i + 1].vWorldViewPosition.z) * t;
+        array_507D30[out_num_vertices].u = array_50AC10[i].u + (array_50AC10[i].u - array_50AC10[i + 1].u) * t;
+        array_507D30[out_num_vertices].v = array_50AC10[i].v + (array_50AC10[i].v - array_50AC10[i + 1].v) * t;
+        array_507D30[out_num_vertices]._rhw = 1.0 / 8.0;
+      }
       //array_507D30[out_num_vertices]._rhw = 0x3E000000u;
       ++out_num_vertices;
     }
-    if ( next_vertices_flag )
-    {
-      pNextVertices = out_num_vertices++;
-      memcpy(&array_507D30[pNextVertices], &array_50AC10[i + 1], 0x30);
+    if ( !next_vertices_flag )
+    {
+      memcpy(&array_507D30[out_num_vertices], &array_50AC10[i + 1], sizeof(array_50AC10[i + 1]));
+      out_num_vertices++;
     }
     current_vertices_flag = next_vertices_flag;
   }
@@ -8561,59 +8577,92 @@
 //----- (00424EE0) --------------------------------------------------------
 int ODM_FarClip(unsigned int uNumVertices)
 {
-  signed int previous_vertices_flag; // edi@1
+  bool current_vertices_flag; // [sp+Ch] [bp-28h]@6
+  bool next_vertices_flag; // edi@1
   double t; // st6@10
-  bool current_vertices_flag; // [sp+Ch] [bp-28h]@6
   signed int depth_num_vertices; // [sp+18h] [bp-1Ch]@1
-  int pNextVertices;
+  //int pNextVertices;
+  bool bFound;
   //Доп инфо "Программирование трёхмерных игр для windows" Ламот стр 910
 
-  memcpy(&array_50AC10[uNumVertices], array_50AC10, sizeof(array_50AC10[uNumVertices]));
+  bFound = false;
+
+  memcpy(&array_50AC10[uNumVertices], &array_50AC10[0], sizeof(array_50AC10[uNumVertices]));
   depth_num_vertices = 0;
-  previous_vertices_flag = 0;
-  if ( array_50AC10[0].vWorldViewPosition.x <= pODMRenderParams->shading_dist_mist )
-    previous_vertices_flag = 1;//предыдущая грань меньше границы видимости
+  current_vertices_flag = false;
+  if ( array_50AC10[0].vWorldViewPosition.x >= pODMRenderParams->shading_dist_mist )
+    current_vertices_flag = true;//настоящая вершина больше границы видимости
   if ( (signed int)uNumVertices <= 0 )
     return 0;
-  for ( uint i = 1; i <= uNumVertices; ++i )
-  {
-    current_vertices_flag = pODMRenderParams->shading_dist_mist >= array_50AC10[i].vWorldViewPosition.x;
-    if ( previous_vertices_flag != current_vertices_flag )//одна из граней за границей видимости
-    {
-      if ( current_vertices_flag )//текущая грань меньше границы видимости(предыдущая грань за пределами видимости)
-      {
-        //t = far_clip - v0.x / v1.x - v0.x    (формула получения точки пересечения отрезка с плоскостью)
-        t = (pODMRenderParams->shading_dist_mist - array_50AC10[i - 1].vWorldViewPosition.x) / (array_50AC10[i].vWorldViewPosition.x - array_50AC10[i - 1].vWorldViewPosition.x);
-        array_507D30[depth_num_vertices].vWorldViewPosition.y = (array_50AC10[i].vWorldViewPosition.y - array_50AC10[i - 1].vWorldViewPosition.y) * t + array_50AC10[i - 1].vWorldViewPosition.y;
-        array_507D30[depth_num_vertices].vWorldViewPosition.z = (array_50AC10[i].vWorldViewPosition.z - array_50AC10[i - 1].vWorldViewPosition.z) * t + array_50AC10[i - 1].vWorldViewPosition.z;
-        array_507D30[depth_num_vertices].u = (array_50AC10[i].u - array_50AC10[i - 1].u) * t + array_50AC10[i - 1].u;
-        array_507D30[depth_num_vertices].v = (array_50AC10[i].v - array_50AC10[i - 1].v) * t + array_50AC10[i - 1].v;
-      }
-      else//предыдущая грань меньше границы видимости(текущая грань вышла за пределы видимости)
+  for (uint i = 0; i < uNumVertices; ++i)// есть ли пограничные вершины
+  {
+    if ( array_50AC10[i].vWorldViewPosition.x < pODMRenderParams->shading_dist_mist )
+    {
+      bFound = true;
+      break;
+    }
+  }
+  if ( !bFound )
+    return 0;
+  //check for far clip plane(проверка по дальней границе)
+  //   
+  // v3.__________________. v0
+  //   |                  |
+  //   |                  |
+  //   |                  |
+  //  ----------------------- 8192.0(far_clip - 0x2000)
+  //   |                  |
+  //   .__________________.
+  //  v2                     v1
+
+  for ( uint i = 0; i < uNumVertices; ++i )
+  {
+    next_vertices_flag = array_50AC10[i + 1].vWorldViewPosition.x >= pODMRenderParams->shading_dist_mist;
+    if ( current_vertices_flag ^ next_vertices_flag )//одна из граней за границей видимости
+    {
+      if ( next_vertices_flag )//следующая вершина больше границы видимости(настоящая вершина меньше границы видимости) - v3
+      {
+        //t = far_clip - v2.x / v3.x - v2.x (формула получения точки пересечения отрезка с плоскостью)
+        t = (pODMRenderParams->shading_dist_mist - array_50AC10[i].vWorldViewPosition.x) / (array_50AC10[i + 1].vWorldViewPosition.x - array_50AC10[i].vWorldViewPosition.x);
+        array_507D30[depth_num_vertices].vWorldViewPosition.x = pODMRenderParams->shading_dist_mist;
+        //New_y = v2.y + (v3.y - v2.y)*t
+        array_507D30[depth_num_vertices].vWorldViewPosition.y = array_50AC10[i].vWorldViewPosition.y + (array_50AC10[i + 1].vWorldViewPosition.y - array_50AC10[i].vWorldViewPosition.y) * t;
+        //New_z = v2.z + (v3.z - v2.z)*t
+        array_507D30[depth_num_vertices].vWorldViewPosition.z = array_50AC10[i].vWorldViewPosition.z + (array_50AC10[i + 1].vWorldViewPosition.z - array_50AC10[i].vWorldViewPosition.z) * t;
+        array_507D30[depth_num_vertices].u = array_50AC10[i].u + (array_50AC10[i + 1].u - array_50AC10[i].u) * t;
+        array_507D30[depth_num_vertices].v = array_50AC10[i].v + (array_50AC10[i + 1].v - array_50AC10[i].v) * t;
+        array_507D30[depth_num_vertices]._rhw = 1.0 / pODMRenderParams->shading_dist_mist;
+      }
+      else//настоящая вершина больше границы видимости(следующая вершина меньше границы видимости) - v0
       {
         //t = far_clip - v1.x / v0.x - v1.x
-        t = (pODMRenderParams->shading_dist_mist - array_50AC10[i].vWorldViewPosition.x) / (array_50AC10[i - 1].vWorldViewPosition.x - array_50AC10[i].vWorldViewPosition.x);
-        array_507D30[depth_num_vertices].vWorldViewPosition.y = (array_50AC10[i - 1].vWorldViewPosition.y - array_50AC10[i].vWorldViewPosition.y) * t + array_50AC10[i].vWorldViewPosition.y;
-        array_507D30[depth_num_vertices].vWorldViewPosition.z = (array_50AC10[i - 1].vWorldViewPosition.z - array_50AC10[i].vWorldViewPosition.z) * t + array_50AC10[i].vWorldViewPosition.z;
-        array_507D30[depth_num_vertices].u = (array_50AC10[i - 1].u - array_50AC10[i].u) * t + array_50AC10[i].u;
-        array_507D30[depth_num_vertices].v = (array_50AC10[i - 1].v - array_50AC10[i].v) * t + array_50AC10[i].v;
-      }
-      array_507D30[depth_num_vertices].vWorldViewPosition.x = pODMRenderParams->shading_dist_mist;
-      array_507D30[depth_num_vertices]._rhw = 1.0 / pODMRenderParams->shading_dist_mist;
+        t = (pODMRenderParams->shading_dist_mist - array_50AC10[i].vWorldViewPosition.x) / (array_50AC10[i + 1].vWorldViewPosition.x - array_50AC10[i].vWorldViewPosition.x);
+        array_507D30[depth_num_vertices].vWorldViewPosition.x = pODMRenderParams->shading_dist_mist;
+        //New_y = (v0.y - v1.y)*t + v1.y
+        array_507D30[depth_num_vertices].vWorldViewPosition.y = array_50AC10[i + 1].vWorldViewPosition.y + (array_50AC10[i].vWorldViewPosition.y - array_50AC10[i + 1].vWorldViewPosition.y) * t;
+        //New_z = (v0.z - v1.z)*t + v1.z
+        array_507D30[depth_num_vertices].vWorldViewPosition.z = array_50AC10[i + 1].vWorldViewPosition.z + (array_50AC10[i].vWorldViewPosition.z - array_50AC10[i + 1].vWorldViewPosition.z) * t;
+        array_507D30[depth_num_vertices].u = array_50AC10[i + 1].u + (array_50AC10[i].u - array_50AC10[i + 1].u) * t;
+        array_507D30[depth_num_vertices].v = array_50AC10[i + 1].v + (array_50AC10[i].v - array_50AC10[i + 1].v) * t;
+        array_507D30[depth_num_vertices]._rhw = 1.0 / pODMRenderParams->shading_dist_mist;
+      }
       ++depth_num_vertices;
     }
-    if ( current_vertices_flag )//оба в границе видимости
-    {
-      pNextVertices = depth_num_vertices++;
-      memcpy(&array_507D30[pNextVertices], &array_50AC10[i], 0x30);
-      //array_507D30[pNextVertices]._rhw = 1.0 / (array_50AC10[i].vWorldViewPosition.x + 0.0000001);
-      //array_507D30[pNextVertices].flt_2C = array_50AC10[i].flt_2C;
-    }
-    previous_vertices_flag = current_vertices_flag;
-  }
-  if ( depth_num_vertices < 3 )
-    return 0;
-  return depth_num_vertices;
+    if ( !next_vertices_flag )//оба в границе видимости
+    {
+      memcpy(&array_507D30[depth_num_vertices], &array_50AC10[i + 1], sizeof(array_507D30[depth_num_vertices]));
+      depth_num_vertices++;
+    }
+    current_vertices_flag = next_vertices_flag;
+  }
+  for (uint i = 0; i < depth_num_vertices; ++i)// есть ли пограничные вершины
+  {
+    if ( array_507D30[i].vWorldViewPosition.x > pODMRenderParams->shading_dist_mist )
+    {
+      __debugbreak();
+    }
+  }
+  return depth_num_vertices >= 3 ? depth_num_vertices : 0;
 }
 
 //----- (0047840D) --------------------------------------------------------