fixed floors sample

src/engine/models/mesh_material.cpp

@@ -23,6 +23,7 @@ MeshMaterial::MeshMaterial()
     facesCount = 0;
     _isNameSet = false;
     _areFacesAllocated = false;
+    _isBoundingBoxCalculated = false;
 }
 
 MeshMaterial::~MeshMaterial()
@@ -65,3 +66,69 @@ void MeshMaterial::setName(char *t_val)
     name = String::createCopy(t_val);
     _isNameSet = true;
 }
+
+u8 MeshMaterial::isInFrustum(Plane *t_frustumPlanes, const Vector3 &position)
+{
+    Vector3 boxCalcTemp;
+    u8 boxResult = 1, boxIn = 0, boxOut = 0;
+    for (int i = 0; i < 6; i++)
+    {
+        boxOut = 0;
+        boxIn = 0;
+        // for each corner of the box do ...
+        // get out of the cycle as soon as a box as corners
+        // both inside and out of the frustum
+        for (int y = 0; y < 8 && (boxIn == 0 || boxOut == 0); y++)
+        {
+            boxCalcTemp.set(
+                boundingBox[y].x + position.x,
+                boundingBox[y].y + position.y,
+                boundingBox[y].z + position.z);
+            if (t_frustumPlanes[i].distanceTo(boxCalcTemp) < 0)
+                boxOut++;
+            else
+                boxIn++;
+        }
+        //if all corners are out
+        if (boxIn == 0)
+            return 0;
+        else if (boxOut)
+            boxResult = 1;
+    }
+    return boxResult;
+}
+
+void MeshMaterial::calculateBoundingBox(Vector3 *t_vertices, u32 t_vertCount)
+{
+    float lowX, lowY, lowZ, hiX, hiY, hiZ;
+    lowX = hiX = t_vertices[vertexFaces[0]].x;
+    lowY = hiY = t_vertices[vertexFaces[0]].y;
+    lowZ = hiZ = t_vertices[vertexFaces[0]].z;
+    for (u32 i = 0; i < facesCount; i++)
+    {
+        if (lowX > t_vertices[vertexFaces[i]].x)
+            lowX = t_vertices[vertexFaces[i]].x;
+        if (hiX < t_vertices[vertexFaces[i]].x)
+            hiX = t_vertices[vertexFaces[i]].x;
+
+        if (lowY > t_vertices[vertexFaces[i]].y)
+            lowY = t_vertices[vertexFaces[i]].y;
+        if (hiY < t_vertices[vertexFaces[i]].y)
+            hiY = t_vertices[vertexFaces[i]].y;
+
+        if (lowZ > t_vertices[vertexFaces[i]].z)
+            lowZ = t_vertices[vertexFaces[i]].z;
+        if (hiZ < t_vertices[vertexFaces[i]].z)
+            hiZ = t_vertices[vertexFaces[i]].z;
+    }
+    boundingBox[0].set(lowX, lowY, lowZ);
+    boundingBox[1].set(lowX, lowY, hiZ);
+    boundingBox[2].set(lowX, hiY, lowZ);
+    boundingBox[3].set(lowX, hiY, hiZ);
+
+    boundingBox[4].set(hiX, lowY, lowZ);
+    boundingBox[5].set(hiX, lowY, hiZ);
+    boundingBox[6].set(hiX, hiY, lowZ);
+    boundingBox[7].set(hiX, hiY, hiZ);
+    _isBoundingBoxCalculated = true;
+}