UPBGE: Fix normal update of BGE skin deformer.

Previously the BGE deformer computation for skin defomers was
computing wrongly the normal for two reasons:

- The normal and position of each wasn't intialized. This is solved
  by copying the normals and position in the function
  BL_MeshDeformer::VerifyStorage no matter what.

- The normals was multiplied by the bone matrix each frame and not
  the "delta" bone matrix. To solve this issue the original unmodified
  normal is multiplied by the bone matrix and copied in the final normal.

source/gameengine/Converter/BL_MeshDeformer.cpp

@@ -214,5 +214,10 @@ void BL_MeshDeformer::VerifyStorage()
 		m_transnors = new float[m_bmesh->totvert][3];
 		m_tvtot = m_bmesh->totvert;
 	}
+
+	for (unsigned int v = 0; v < m_bmesh->totvert; v++) {
+		copy_v3_v3(m_transverts[v], m_bmesh->mvert[v].co);
+		normal_short_to_float_v3(m_transnors[v], m_bmesh->mvert[v].no);
+	}
 }
 

source/gameengine/Converter/BL_SkinDeformer.cpp

@@ -250,6 +250,7 @@ void BL_SkinDeformer::BGEDeformVerts()
 	for (int i = 0; i < m_bmesh->totvert; ++i, dv++) {
 		float contrib = 0.0f, weight, max_weight = -1.0f;
 		bPoseChannel *pchan = NULL;
+		Eigen::Vector3f normorg(m_bmesh->mvert[i].no[0], m_bmesh->mvert[i].no[1], m_bmesh->mvert[i].no[2]);
 		Eigen::Map<Eigen::Vector3f> norm = Eigen::Vector3f::Map(m_transnors[i]);
 		Eigen::Vector4f vec(0.0f, 0.0f, 0.0f, 1.0f);
 		Eigen::Vector4f co(m_transverts[i][0],
@@ -289,7 +290,7 @@ void BL_SkinDeformer::BGEDeformVerts()
 		}
 
 		// Update Vertex Normal
-		norm = norm_chan_mat.topLeftCorner<3, 3>() * norm;
+		norm = norm_chan_mat.topLeftCorner<3, 3>() * normorg;
 
 		co.noalias() += vec / contrib;
 		co[3] = 1.0f; // Make sure we have a 1 for the w component!
@@ -371,12 +372,6 @@ bool BL_SkinDeformer::UpdateInternal(bool shape_applied)
 		if (!shape_applied) {
 			/* store verts locally */
 			VerifyStorage();
-
-			/* duplicate */
-			for (int v = 0; v < m_bmesh->totvert; v++) {
-				copy_v3_v3(m_transverts[v], m_bmesh->mvert[v].co);
-				normal_short_to_float_v3(m_transnors[v], m_bmesh->mvert[v].no);
-			}
 		}
 
 		m_armobj->ApplyPose();