Structs are a welcome improvement. Using Protobuf, I was forced to move from a 3d vector type to an array of doubles to get packed=true performance. Small loss of expressiveness, no big deal, but I can imagine it getting a lot worse for heterogeneous and/or more complex structs. Was a shock to see a dynamic allocation for every vector in my 1000-element array. (I understand why this is necessary given the spec of Protobuf though.)
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Structs are a welcome improvement. Using Protobuf, I was forced to move from a 3d vector type to an array of doubles to get packed=true performance. Small loss of expressiveness, no big deal, but I can imagine it getting a lot worse for heterogeneous and/or more complex structs. Was a shock to see a dynamic allocation for every vector in my 1000-element array. (I understand why this is necessary given the spec of Protobuf though.)
Yup. An array of Vec3 (3 floats) will just take N*12 bytes, as you expect.