Fix wrong analysis if persistence < 0 and absvalue

init.lua

@@ -349,7 +349,15 @@ local analyze_noiseparams = function(noiseparams)
 		-- Calculate the two possible extreme values
 		-- with the octave value being either at 1 or -1.
 		local limit1 = (1 * np.persistence ^ exp)
-		local limit2 = (-1 * np.persistence ^ exp)
+		local limit2
+		if not is_absolute then
+			limit2 = (-1 * np.persistence ^ exp)
+		else
+			-- If absvalue is set, one of the
+			-- limits is always 0 because we
+			-- can't get lower.
+			limit2 = 0
+		end
 
 		-- To add to the maximum, pick the higher value
 		if limit1 > limit2 then
@@ -357,15 +365,12 @@ local analyze_noiseparams = function(noiseparams)
 		else
 			o_max = o_max + limit2
 		end
-		if not is_absolute then
-			-- To add to the minimum, pick the LOWER value
-			if limit1 > limit2 then
-				o_min = o_min + limit2
-			else
-				o_min = o_min + limit1
-			end
-			-- Note: If absvalue flag is set, the sum of the octaves
-			-- is always 0, so we don't need to calculate it
+
+		-- To add to the minimum, pick the LOWER value
+		if limit1 > limit2 then
+			o_min = o_min + limit2
+		else
+			o_min = o_min + limit1
 		end
 	end
 	-- Add offset and scale to min/max value (final step)