fixed tangent space

src/mesh.cpp

@@ -367,6 +367,8 @@ void Mesh::computeTangents()
         
         glm::vec3 binormalDir = deltaUV1.x * edge2 - deltaUV2.x * edge1;
         binormalDir = glm::normalize(binormalDir*f);
+        if(glm::dot(glm::cross(normals[vertexId0], binormalDir), tangentDir) < 0.f)
+            binormalDir = -binormalDir;
         
         tangents[vertexId0] = {tangentDir, binormalDir};
         tangents[vertexId1] = {tangentDir, binormalDir};