A1 Sector Over Sector Water

This effect is very cool. It was originally designed by Ben Roffelson. Using the "Sector Over Sector" and "Submergible Water" effects together, you can create submergible water which actually looks like it has a sector directly below it! The concept is simple, but explaining it is extremely difficult.

Create an above-water sector. Tag it [0,1].

Create a hallway attached to the room as shown below. Notice how the hallway crosses through the room but does not share any vertices with it.

Place an S[Channel,7] in the above-water sector.

Use Right Alt to encapsulate the above-water sector. It will flash green when highlighted. Press Insert to copy the above-water sector. Now use the Left Mouse Button to drag the copied sector somewhere else on the map. This new sector will be the below-water sector. Tag it [0,2].

Although the picture looks complicated, this is really simple. Attach a small sector to the side of the below-water sector. This is going to be a window. Split the small sector in half. Mask the middle wall of the small sector and change it to a window. Make it transparent and give it a palette of 1 (blue).

Turn grid locking off (using the L key). When grid locking is off, the mouse cursor will appear white. Now use Right Shift to encapsulate the below-water sector. Drag it to the above-water sector and place it as close as possible to the above-water sector without actually touching it. Absolutely none of the above and below-water sector's vertices can touch, or the whole thing is ruined! In the image, the two sectors are almost overlapped.

Connect the hallway to the window sector.

To make it realistic, slope the hallway's floors so they look like stairs, and lower the below-water sector (so it actually seems like it is truly under the water's surface). You're finished! In the game, you can submerge under the water and look into the hallway through the window. Then you can surface, walk down the hallway, and see into the water through the window.

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