CompuServe Thread

#Cool Reflection?

13 messages in this thread
#136946From: David GouldNov 18, 1994 5:47 PM
>> Because you wrote such a great book Inside 3D Studio I'll let that one go! <<I just _knew_ there was a good reason to work on that book! Thanks for understanding!>> It's also good as a doorstop and is quite impressive in both weight and size compared to the average "Complete and Updated with Corrections" Bible. But my cat found it more useful as a scratch pad! Since you are the demi-god of 3D Studio, could you give me a quick hint on how to create a really cool reflection of the blade of a sword that I've created. Using a metal texture, like silver, and placing a few well positioned lights doesn't get me the effect I want. Thanks.
#137065From: Nov 19, 1994 9:01 PM
David: >> reflections Do you want automatic or mapped? For a sword, mapped would probably be fine. Use refmap.gif or a similar file to map on as a reflection, map it on, and play with that. How close is the sword to the camera? >> Since you are the demi-god of 3D Studio… Oh, stop it, I'm blushing! Greg Pyros
#137722From: David GouldNov 23, 1994 6:00 PM
<<Do you want automatic or mapped? For a sword, mapped would probably be fine. Use refmap.gif or a similar file to map on as a reflection, map it on, and play with that. How close is the sword to the camera?>> I'd already tried this before sending the original question. The problem is that even with the reflection map, there is no streaky lines across the blade like you would see if it was made from chrome. The reflection map doesn't show across the sword. It is either gray or bright white depending on where the lights are positioned. I want something more like chrome where there are 'bands' of bright and dark areas, but no gray. It has too look as though it is made of highly polished metal, not galvanised tin. I tried using the refmap.gif as a texture map also but this didn't achieve the required result, though it did come a little close to the 'streaking' I wanted. I faintly remember you giving a good suggestion for metal text that showed a good reflection. How would that work in this case? Also how can I simulate refraction in 3D Studio? I want to have a bottle show refraction. Thanks guru, oops I'd hate to make you blush again! 🙂
#137744From: ALAN IGLESIASNov 23, 1994 8:11 PM
Try using granite.cel for the reflection map in your sword material, David. -Alan
#137809From: david W. mennenohNov 24, 1994 11:00 AM
David, The reason that you're not seeing reflections on your sword is most likely due to the fact that you're sword is flat. You will get the same result if you apply any of the chrome materials to something like letters in a word. The nice reflections will show up on the curved portions of a letter (like the inside of a "c") but the faces of these objects will be just a lifeless gray. I suspect the same is happening with the sword. There are a few things you could do. You could make an animated texture map, but timing would need to be considered as you wouldn't want too much hilight movement when the sword wasn't moving. You could just write down various key positions and use those to aid in making the anim. This way would probably give you the most control. You could also re-loft your sword using say, an ellipse, or maybe even a cool star like object to introduce some curves into the blade. You probably won't need too much curviness and it shouldn't be obvious to the viewer. This way using the chrome materials would work. Other than that, I've made nice looking reflections in flat faced logo's etc. by using a big "S" shaped object in front of my object but behind the camera (or in front of the camera if the objects normals are facing away from the camera) and assigning this object the chrome material. Then you'd assign a flat auto-reflection material to the "front faces" of the logo and the chrome material to the logo object. You do need to assign to the object then the faces. You could rotate the reflector etc. to make the hilights move. There is also a chapter on logo highlighting in the Special F/X book. Though I haven't read it yet, I believe it's on how you can control IPAS routines like hi-lite. Good luck. Dave Mennenoh
#138362From: Nov 28, 1994 4:06 PM
David: I just read the answers from others to your message about the sword, and I realized that I had assumed that you lofted the blade. Did you loft it (I'd create it as a diamond with a rounded edge in the center and a good sharp point at the edges). If you did just use a flat piece, you would have a very different effect. Good eyes, DaveM for catching this! Greg Pyros
#137429From: Andrew SinagraNov 22, 1994 9:50 AM
>> could you give me a quick hint on how to create a really cool reflection of the blade of a sword that I've created >> Use refmap.gif or a similar file to map on as a reflection, map it on, and play with that. I used this method on a sword and it looks great. Just make sure that your sword has angled sides to really show off the relfection. Andrew
#137721From: David GouldNov 23, 1994 6:00 PM
I'd already tried this before sending the original question. The problem is that even with the reflection map, there is no streaky lines across the blade like you would see if it was made from chrome. The reflection map doesn't show across the sword. It is either gray or bright white depending on where the lights are positioned. I want something more like chrome where there are 'bands' of bright and dark areas, but no gray. It has too look as though it is made of highly polished metal, not galvanised tin. I tried using the refmap.gif as a texture map also but this didn't achieve the required result, though it did come a little close to the 'streaking' I wanted. The blade is sloping from the middle to the sharp edges so a reflection is possible. Also how can I simulate refraction in 3D Studio? I want to have a bottle show refraction.
#137736From: Phillip L. MillerNov 23, 1994 7:32 PM
Reflection maps are always applied spherically. If your sword is falt, it isn't going to catch much of the reflection. You might try mising a blurred textrue map with the reflection map. Also, try tesselating the sword blade and give it a slight outward bulge. his will go a long way in picking up reflections. As for refractions, you might want to check ou the 3DS Special Effects book.
#137788From: Jeremy Hubbell [Adesk]Nov 24, 1994 3:43 AM
<If your sword is falt…> and others. Phil, you need a spell checker<g>. Jh
#138233From: SyndesisNov 28, 1994 10:32 AM
Actually, he's just telecommunicating on a Newton. 🙂
#137834From: David GouldNov 24, 1994 7:32 PM
<<As for refractions, you might want to check ou the 3DS Special Effects book>> I haven't got this book and I need the image finished 'yesterday', so could you please give me a quick overview of how the book describes refraction. Thanks!
#137862From: Phillip L. MillerNov 25, 1994 6:16 AM
>>could you please give me a quick overview of how the book describes refraction Basically you're using greyscale bitmaps to aproximate its effect as opacity maps within the material and with carefully placed projector spotlights fro the shadows.