CompuServe Messages

Glass Case effect- how?

    10-Apr-94 21:25:55
Fm: Phillip L. Miller 74710,3061
To: Judy Weller 72662,536
You've received several good suggestions already, but to be fair we have to know a few things. Is this an animation? Is there a background of any sort? What can be seen through the case? (not just the vase) Examine the glass, in say a Jeweler's. The glass catches only glances of other light. One's perception of "glass" are these interminate occurences of refelection, shade and very slight distortion as they occur over time. In creating an animation these effects would be very subtle in any given frame and would only read when played (as would a VHS movie of a store's display). If your goal is a still frame, then you need to be VERY careful of not over-doing the effect. Glass is subtle if not invisible (that's why one uses it for a display case <g>) and if you force the effect the glass may seem rippled, smoked or mirrored – very strange material choices for a case. The key then is the gleam of a glancing light and perhaps a subtle refelection in the highlight (Specular Maps work great for this). The effect of glass is also most evident when you can compare it to the side where there is no effect and to the inside edges where one would see through two layers of glass to what's beyond (sorry, but I'm a realist at heart <g>). – Phil p.s. 70% transparency is WAY TOO opaque for a glass case (assuming it is clean and you do want to see inside). Try "pushing" the plane of glass to the side half way and see the effect of this translucent glass and that of no glass at all – there has to be a big difference.