Fix broken analyis for negative scale

init.lua

@@ -187,10 +187,16 @@ local analyze_noiseparams = function(noiseparams)
 			-- is always 0, so we don't need to calculate it
 		end
 	end
-	-- Offset and scale
+	-- Add offset and scale to min/max value (final step)
 	local min_value = np.offset + np.scale * o_min
 	local max_value = np.offset + np.scale * o_max
 
+	-- Bring the 2 values in the correct order
+	-- (min_value might be bigger for negative scale)
+	if min_value > max_value then
+		min_value, max_value = max_value, min_value
+	end
+
 	-- Calculate "wavelengths"
 	local axes = { "x", "y", "z" }
 	local waves = {}