seamless tileable texture of white roof shingles uniform consistent pattern with horizontal overlapping shingles subtle shadow between layers for depth color clean white with very light gray variation for realism material asphalt composite shingles fine grain texture matte finish no dirt no damage no stains no discoloration even lighting no highlights no reflections no perspective distortion perfectly flat front facing view edges must align seamlessly when tiled 4k 8k resolution ultra sharp detail neutral background no logos no objects no gaps keywords seamless tileable white roof shingles clean pattern uniform structure architectural material texture