A COMPREHENSIVE PHYSICAL MODEL FOR LIGHT REFLECTION IN TEXTILES FOR COMPUTER GRAPHICS APPLI.pdf

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A COMPREHENSIVE PHYSICAL MODEL FOR LIGHT REFLECTION IN TEXTILES FOR COMPUTER GRAPHICS APPLI.pdf

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A COMPREHENSIVE PHYSICAL MODEL FOR LIGHT REFLECTION IN TEXTILES FOR COMPUTER GRAPHICS APPLI

AUTEX Research Journal, Vol. 2, No4, December 2002 ? AUTEX /No6/0041.pdf A COMPREHENSIVE PHYSICAL MODEL FOR LIGHT REFLECTION IN TEXTILES FOR COMPUTER GRAPHICS APPLICATIONS THEVENET Ludovic*, DUPONT Daniel**, CAZE Claude*** *Laboratoire GEnie et Matériaux TEXtiles (GEMTEX), UPRES EA2161, école Nationale des Arts et Industries Textiles (ENSAIT), 9, rue de l’Hermitage, BP 30329, 59056 ROUBAIX Cedex 01, France Corresponding author. Tel.: +33-3-20-25-64-57 fax.: +33-3-20-27-27-97 E-mail address: ludovic.thevenet@ensait.fr **Laboratoire GEnie et Matériaux TEXtiles (GEMTEX), UPRES EA2161, école Supérieure des Techniques Industrielles et des Textiles, 52, allée Lakanal, BP 209, 59654 VILLENEUVE D’ASCQ Cedex, France ***Laboratoire GEnie et Matériaux TEXtiles (GEMTEX), UPRES EA2161, école Nationale des Arts et Industries Textiles (ENSAIT), 9 rue de l’Hermitage, BP 30329, 59056 ROUBAIX Cedex 01, France Abstract: This paper is concerned with the optical properties and 3D modelling of textile structures (yarn, woven and knitted product). A method for establishing a set of statistical surface parameters for a fibre from atomic force microscopy measurement is proposed. This technique is adapted for yarn. Nevertheless, AFM measurements are impossible for this structure, so a virtual profiler has been developed. Finally, several reflectance models are compared. The Lafortune model is the most adapted to predict reflectance properties of yarn. The correlation of estimated and measured surface parameters is processed to make the model physically plausible for textile materials. Once this task has been achieved, this modified model is implanted in a ray tracing program for more realistic computer graphic application in the field of textiles. Keywords: textile structure, 3-D modelling, reflectance models, CAD of textiles I. Introduction Today, in order to assess the appearance of any given textile, individual samples must be physically produced and subordinated to yarn availability. Mor