Better default values for normals and tangents (VBOs) (#4763)

src/rmodels.c

@@ -1307,7 +1307,7 @@ void UploadMesh(Mesh *mesh, bool dynamic)
     {
         // Default vertex attribute: normal
         // WARNING: Default value provided to shader if location available
-        float value[3] = { 1.0f, 1.0f, 1.0f };
+        float value[3] = { 0.0f, 0.0f, 1.0f };
         rlSetVertexAttributeDefault(RL_DEFAULT_SHADER_ATTRIB_LOCATION_NORMAL, value, SHADER_ATTRIB_VEC3, 3);
         rlDisableVertexAttribute(RL_DEFAULT_SHADER_ATTRIB_LOCATION_NORMAL);
     }
@@ -1339,7 +1339,7 @@ void UploadMesh(Mesh *mesh, bool dynamic)
     {
         // Default vertex attribute: tangent
         // WARNING: Default value provided to shader if location available
-        float value[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
+        float value[4] = { 1.0f, 0.0f, 0.0f, 1.0f };
         rlSetVertexAttributeDefault(RL_DEFAULT_SHADER_ATTRIB_LOCATION_TANGENT, value, SHADER_ATTRIB_VEC4, 4);
         rlDisableVertexAttribute(RL_DEFAULT_SHADER_ATTRIB_LOCATION_TANGENT);
     }