--- old/modules/graphics/src/main/native-prism-d3d/D3DMesh.cc	2013-11-12 20:09:19.201171800 +0400
+++ new/modules/graphics/src/main/native-prism-d3d/D3DMesh.cc	2013-11-12 20:09:18.773437500 +0400
@@ -105,14 +105,15 @@
 //            << ", indexBufferSize = " << ibSize << endl;
 
     IDirect3DDevice9 *device = context->Get3DDevice();
-    UINT size = vbSize * sizeof (float);
+    UINT size = vbSize * sizeof (float); // in bytes
+    UINT vbCount = size / PRIMITIVE_VERTEX_SIZE; // in vertices
     HRESULT result = D3D_OK;
 
-    if (numVertices != vbSize) {
+    if (numVertices != vbCount) {
         releaseVertexBuffer();
         result = device->CreateVertexBuffer(size, D3DUSAGE_WRITEONLY, fvf,
                 D3DPOOL_DEFAULT, &vertexBuffer, NULL);
-        numVertices = vbSize;
+        numVertices = vbCount;
     }
 
     if (SUCCEEDED(result) && (vertexBuffer != NULL)) {
@@ -151,14 +152,15 @@
 //            << ", indexBufferSize = " << ibSize << endl;
 
     IDirect3DDevice9 *device = context->Get3DDevice();
-    UINT size = vbSize * sizeof (float);
+    UINT size = vbSize * sizeof (float); // in bytes
+    UINT vbCount = size / PRIMITIVE_VERTEX_SIZE; // in vertices
     HRESULT result = D3D_OK;
 
-    if (numVertices != vbSize) {
+    if (numVertices != vbCount) {
         releaseVertexBuffer();
         result = device->CreateVertexBuffer(size, D3DUSAGE_WRITEONLY, fvf,
                 D3DPOOL_DEFAULT, &vertexBuffer, NULL);
-        numVertices = vbSize;
+        numVertices = vbCount;
     }
 
     if (SUCCEEDED(result) && (vertexBuffer != NULL)) {