5 ms·

It's still not "true" 3D because there's still clearly a preferred direction (it looks like lasagna). Consider the human brain... or maybe not, since AFAIK it'

It's still not "true" 3D because there's still clearly a preferred direction (it looks like lasagna). Consider the human brain... or maybe not, since AFAIK it's still only a (heavily folded) surface ?

jayd16 4y ago
Is a grid not true 2D?
- jfoutz 4y ago
  Not quite. X and Y are floats. Z is ints. You can’t freely transform in all dimensions
  - ralusek 4y ago
    aren't all transistor or gates or whatever fundamentally discrete entities?
    - Nevermark 4y ago
      I think maybe "Floats" and "Ints" in this case are not referring to numerical computation. Perhaps not the best terminology. The point being, that typical components are organized on a 2D wafer's surface, aligned with the 2D's surfaces two axes. Transistors are not normally oriented with arbitrary rotations in the 0-360 range of possible rotations. One reason for this alignment, is that a consistent angle between transistor layout and the silicon's preferred crystalline plane direction, allows for control of material stress and device electron mobility. That would hold even stronger for 3D structures. Transisters are still likely to oriented in exactly the same way on the 2D surface of each wafer. Not oriented to any of three possible 2D grid orientations of a 3D grid (think: the three 2D surfaces that come together at a corner of a cube). And certainly not oriented with arbitrary rotations across all three dimensions.
dgb23 4y ago
Buildings with multiple stories are stacked lasagna, but they have beneficial scaling properties.
PaulHoule 4y ago
When I think of the convolutions of the brain I think a little of "3D NAND" products which are built around trenches https://newsroom.lamresearch.com/Tech-Brief-Memory-Grows-Up-with-3D-NAND https://newsroom.lamresearch.com/Tech-Brief-Memory-Grows-Up-... My understanding is that the cerebral cortex has several layers of active neurons "grey matter" in a folded but basically 2D structure and there are bunch of axons "white matter" that connect those layers to other parts of the cerebral cortex and also to other structures that are structurally different such as the brainstem, hippocampus, cerebrum, etc. that evolved at a different time.
pengaru 4y ago
> Consider the human brain... or maybe not, since AFAIK it's still only a (heavily folded) surface ? The glymphatic system of the brain piggy-backing atop the cardiovascular system further illustrates the packaging challenges though

jayd16 4y ago

Is a grid not true 2D?

jfoutz 4y ago
Not quite. X and Y are floats. Z is ints. You can’t freely transform in all dimensions
- ralusek 4y ago
  aren't all transistor or gates or whatever fundamentally discrete entities?
  - Nevermark 4y ago
    I think maybe "Floats" and "Ints" in this case are not referring to numerical computation. Perhaps not the best terminology. The point being, that typical components are organized on a 2D wafer's surface, aligned with the 2D's surfaces two axes. Transistors are not normally oriented with arbitrary rotations in the 0-360 range of possible rotations. One reason for this alignment, is that a consistent angle between transistor layout and the silicon's preferred crystalline plane direction, allows for control of material stress and device electron mobility. That would hold even stronger for 3D structures. Transisters are still likely to oriented in exactly the same way on the 2D surface of each wafer. Not oriented to any of three possible 2D grid orientations of a 3D grid (think: the three 2D surfaces that come together at a corner of a cube). And certainly not oriented with arbitrary rotations across all three dimensions.

dgb23 4y ago

Buildings with multiple stories are stacked lasagna, but they have beneficial scaling properties.

PaulHoule 4y ago

When I think of the convolutions of the brain I think a little of "3D NAND" products which are built around trenches https://newsroom.lamresearch.com/Tech-Brief-Memory-Grows-Up-with-3D-NAND https://newsroom.lamresearch.com/Tech-Brief-Memory-Grows-Up-... My understanding is that the cerebral cortex has several layers of active neurons "grey matter" in a folded but basically 2D structure and there are bunch of axons "white matter" that connect those layers to other parts of the cerebral cortex and also to other structures that are structurally different such as the brainstem, hippocampus, cerebrum, etc. that evolved at a different time.

pengaru 4y ago

> Consider the human brain... or maybe not, since AFAIK it's still only a (heavily folded) surface ? The glymphatic system of the brain piggy-backing atop the cardiovascular system further illustrates the packaging challenges though