Normalize skinning weights from Blender

hecl/blender/BlenderConnection.cpp

@@ -653,6 +653,7 @@ BlenderConnection::DataStream::Mesh::Mesh
         for (uint32_t j=0 ; j<bindCount ; ++j)
             binds.emplace_back(conn);
     }
+    normalizeSkinBinds();
 
     /* Assume 16 islands per material for reserve */
     if (materialSets.size())

hecl/blender/BlenderConnection.hpp

@@ -15,6 +15,7 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <float.h>
 #include <string>
 #include <functional>
 #include <iostream>
@@ -430,6 +431,19 @@ public:
             std::vector<std::vector<SkinBind>> skins;
             std::vector<size_t> contiguousSkinVertCounts;
 
+            void normalizeSkinBinds()
+            {
+                for (std::vector<SkinBind>& skin : skins)
+                {
+                    float accum = 0.f;
+                    for (const SkinBind& bind : skin)
+                        accum += bind.weight;
+                    if (accum > FLT_EPSILON)
+                        for (SkinBind& bind : skin)
+                            bind.weight /= accum;
+                }
+            }
+
             /** Islands of the same material/skinBank are represented here */
             struct Surface
             {

hecl/blender/HMDL.cpp

@@ -135,6 +135,7 @@ HMDLBuffers BlenderConnection::DataStream::Mesh::getHMDLBuffers(bool absoluteCoo
         {
             const SkinBanks::Bank& bank = skinBanks.banks[s.skinBankIdx];
             const std::vector<SkinBind>& binds = skins[v.iSkin];
+
             auto it = bank.m_boneIdxs.cbegin();
             for (size_t i=0 ; i<weightVecCount ; ++i)
             {

hecl/extern/boo

@@ -1 +1 @@
-Subproject commit a96b5879657efb449326a56826bb944b8892b7d6
+Subproject commit c33f8d5d3cd1675d851fbf96a1b30ac4fae90dfc