Abstract: Colors are obtained and used to shade two-dimensional non-photo realistic images of three-dimensional models. The colors are stored as texels in texture maps. The texels are chosen to shade the images based on their orientation in a scene. The colors may be obtained once, in a pre-rendering process. The colors may then be selected in a run-time process.

Abstract: A system and method is disclosed for providing a reward-based digital mobile coupon environment, where the digital coupons may be shared among peers. Consumers utilize mobile digital coupon carriers having digital representations of coupons. Sharing of coupons among peers may be rewarded with additional discounts or points. The digital coupon carriers communicate with electronic coupon terminals at retail locations for automatic coupon redemption. A coupon may correspond to a globally unique identifier in order to track usage, sharing and redemption. Coupon use and sharing may be dependent upon stored user profiles, merchant profiles and policies, or programs embedded in the coupon.