When I supply GND to the lower layer and VCC to the front left column, I also light up the upper right led in the front (3,3,3), and the lower left LED in the back (0,0,0). However, if I also want to light up the bottom right corner in the front (3,3,0), I run into problems. If i only want to light up one led at a time, or only light up more than one layer at the same time. Now if i want to light up the LED in the upper left corner in the back (0,0,3), I just supply GND (-) to the upper layer, and VCC (+) to the column in the left corner. All the LEDs on a horizontal layer share a common cathode (-). All the LEDs aligned in a vertical column share a common anode (+). One way to get around this, is to split the cube into 4 layers of 16x16 LEDs. How to control 64 LEDs without using 64 individual wires? Running a wire to the anode of each led would obviously be impractical, and would look really bad.
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