Refactoring: add usage of ai_epsilon to fbx.

code/AssetLib/FBX/FBXCommon.h

@@ -80,8 +80,10 @@ enum TransformInheritance {
 
     TransformInheritance_MAX // end-of-enum sentinel
 };
+
 } // namespace FBX
 } // namespace Assimp
+
 #endif // ASSIMP_BUILD_NO_FBX_EXPORTER
 
 #endif // AI_FBXCOMMON_H_INC

code/AssetLib/FBX/FBXConverter.cpp

@@ -3187,7 +3187,8 @@ aiNodeAnim* FBXConverter::GenerateSimpleNodeAnim(const std::string& name,
     }
 
     bool ok = false;
-    const float zero_epsilon = 1e-6f;
+    
+    const float zero_epsilon = ai_epsilon;
 
     const aiVector3D& preRotation = PropertyGet<aiVector3D>(props, "PreRotation", ok);
     if (ok && preRotation.SquareLength() > zero_epsilon) {