+ Render water nodes partially transparent

init.lua

@@ -52,9 +52,9 @@ local get_fog = function( distance )
    return clamp( math.pow ( distance / 128, 2 ), 0, 1 )
 end
 
-local shade = function( origin, target, background_color )
-	local ray = minetest.raycast( origin, target, false, true )
-	local color
+local shade = function( origin, target, background_color, liquids )
+	local ray = minetest.raycast( origin, target, false, liquids )
+	local color, hit_water
 	for pointed_thing in ray do
 		if "node" == pointed_thing.type then
 			local position = pointed_thing.under
@@ -74,10 +74,11 @@ local shade = function( origin, target, background_color )
 				l_color * ( 1 - fog ) +
 				background_color * fog
 			)
+			hit_water = node.name:find("water")
 			break
 		end
 	end
-	return color
+	return color, hit_water
 end
 
 x_offset_by_sample = { 0, 1, 0, 1, 0, 1,-1,-1,-1 }
@@ -104,6 +105,7 @@ local create_photo_pixels = function( player_name )
 		pixels[h] = {}
 		for w = 1,width,1 do
 			local x = width - ( w - 1 )
+			local sky_color = 191 - math.floor ( y / 2 )
 			local samples = 4 -- can be up to 9
 			local acc_color = 0
 			for sample = 1,samples,1 do
@@ -115,9 +117,22 @@ local create_photo_pixels = function( player_name )
 				) * 2
 				local pos1 = eye
 				local pos2 = eye + lens + ( dir * 128 )
-				local color = shade( pos1, pos2, bg )
-				if nil == color then  -- probably the sky
-					color = 191 - math.floor ( y / 2 )
+				local color, hit_water = shade(
+					pos1,
+					pos2,
+					bg,
+					true
+				)
+				color = color or sky_color
+				if hit_water then
+					local color2, _ = shade(
+						pos1,
+						pos2,
+						bg,
+						false -- no liquids
+					)
+					color2 = color2 or sky_color
+					color = ( color * 3 + color2 ) / 4
 				end
 				acc_color = acc_color + (
 					clamp(