EFFECT OF SURFACE PROPERTIES ON THE VISUAL EVALUATION OF BUILDING STONE FINISHING : Part 4 Influences of lighting irradiation angle and observation distance on visual evaluation of sandstone

Abstract

1ロ this paper， thc effects of the lighting irradiation angle and the observation distan on the visual evaluation of building s 重 one finishi 皿 g were investi 解 量 ed ． Ih 。 faclo 【s affecting 重 he visual evaluation suclr as llnevenness ， co 鰤 面 f s重one surfaee were analyzed by performing th。 sensory test llsing the natUral sandstone specimen which were changing the stone type ， surface fillishing method and surfaee pattern ． in the sensory test， lighting irtadiation angle (θ) fbr the stone su 血 cc and 宣 he observation dista ロce (L) we 爬 cha 皿 ged， and the 爬 lationships betweenθ ，五 and the sensory values were considered ． It was cleared that the visuaL evaluation ofuncven 皿ess b ame sma 艮er with increasing distance undcr 15， 30 degrees of lighting irradiation angle ， and the ova 且 uation of smooth surface dose not change with the observatio 皿 distaricc ・ Keywords ： stone finishing ， SUifacepre ρ erties ， visual evaiuation ， sensory test ， irradiation angle ・ observati ・ n distance 石 材 仕 上 げ ，表 面 性 状 ，視覚的評価，官能検査 ，照射 角 度 ，観察距離