I have a scenario when i update my primitives quite fast.
In this scenario I’m getting an exception from time time of “Cannot read property ‘0’ of undefined” at z.getGeometryInstanceAttributes.
From looking in the code https://github.com/AnalyticalGraphicsInc/cesium/blob/1.0/Source/Scene/Primitive.js#L1079
I can see that the primitive in some state that the defined check at start passed but _perInstanceAttributeLocations is still undefined.
Any ideas ?