The emulator will never know everything about the tube (how far does it go down? what's at the bottom?), but it knows what a tube is and if you tell it that a tile is supposed to be shaped like a tube, it can apply a conversion attempt based on what it understands a tube to be. Since NES graphics tend to be simple in order to work and to be repeated, the tricks will probably work a good percentage of the time. The inside of the tube then is just the outside repeated. Like with a box, it knows how to draw a tube, with a opening and a backside and rounded edges it knows what a "cylinder" is and applies the available graphic elements of the flat bitmap or sprite to the "walls" of a tube. Similarly, cylinders seem to use parts of the sides of the cylinder to fill in with repeating texture as you rotate around from one side's perspective to the other. (Though I don't know how it knows to make it more yellow ala the "top", either it's a color blending of the yellow and the brown of the bitmap or if it intentionally draws the tops of objects always a shade or two lighter for effect? You see a similar effect on coin blocks, which are even simpler than the ground.) So it looks like the wavy block of the original square bitmap gets reused to create the top of the cube. And then there seem to be (I haven't downloaded yet) parameters for what defines the cube edges, whether it's a cube that just uses the same color of the "top" of the square bitmap to repeat back when it becomes a cube, or instead the graphic of the "side" gets mapped onto the top of the cube. You can find help in the official GBATemps thread. Developed by Geod Studio, the emulator is still in beta mode and has been released this week for all of us to try. 3DNes is a Unity-based emulator that adds another dimension to Nintendo's very first video games. So, as I understand it, the floor would be defined as a "cube", thus the square shape jutting out of the background. 3DNES is a NES emulator homebrew for 3DS developed by st4rk. No, this is not another trick Nintendo has for its handheld nor a homebrew app for the same console.
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