Thank you very much!
The sea effect to a bit of thinking to figure out, and it really needs a better texture artist than me, but it's fairly simple.
First, make the terrain from a relief map. Then, add the water as a plain. Texture both on the first layer appropriately.
For the second and third layers of the sea texture, I scaled up a big, blurry texture that is actually very close to black. With the blending set correctly, the non-black parts show up as a gentle grey. I drew it a little stripy, like ripples. The third layer is scaled to be a mirror of the second, and they are then scrolled in opposite directions.
Finally, the last layer of the water is the cunning transparency effect near the coastline. For this, make a copy of the relief map for the terrain, invert the colours, and then through use of contrast and dilate tools, expand the dark area of the land on this new texture and tighten it up a little. Use this as an alpha mask to make the sea layers transparent towards the island. I don't have my code handy right now, so this last texture might actually need to be the "bottom" one in terms of layers.
Sorry, that's a poor explanation. I can be more precise if necessary.
The sea effect to a bit of thinking to figure out, and it really needs a better texture artist than me, but it's fairly simple.
First, make the terrain from a relief map. Then, add the water as a plain. Texture both on the first layer appropriately.
For the second and third layers of the sea texture, I scaled up a big, blurry texture that is actually very close to black. With the blending set correctly, the non-black parts show up as a gentle grey. I drew it a little stripy, like ripples. The third layer is scaled to be a mirror of the second, and they are then scrolled in opposite directions.
Finally, the last layer of the water is the cunning transparency effect near the coastline. For this, make a copy of the relief map for the terrain, invert the colours, and then through use of contrast and dilate tools, expand the dark area of the land on this new texture and tighten it up a little. Use this as an alpha mask to make the sea layers transparent towards the island. I don't have my code handy right now, so this last texture might actually need to be the "bottom" one in terms of layers.
Sorry, that's a poor explanation. I can be more precise if necessary.