Starkdog opened this issue on Feb 12, 2005 ยท 16 posts
Starkdog posted Sat, 12 February 2005 at 5:13 AM Online Now!
Starkdog posted Sat, 12 February 2005 at 5:14 AM Online Now!
randym77 posted Sat, 12 February 2005 at 5:30 AM
The normals might be reversed. IME, that's usually the problem when things render black when they're not supposed to. If you can, try using the grouping tool to select the band and reverse its normals. Then see if renders correctly.
operaguy posted Sat, 12 February 2005 at 5:45 AM
:::: uploading the love of god to the starkdog ::::: and bookmarking. frankly, i am fascinated by the term "Your normals are reversed" in general, and looking forward to seeing the results for Poser. ::::: Opera :::::
Dave-So posted Sat, 12 February 2005 at 7:26 AM
my normals have been reversed since birth... what are normals anyway ???? all i see here are a hat with a band...and probably some polygons if you look at the mesh
Humankind has not
woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound
together.
All things connect......Chief Seattle,
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Starkdog posted Sat, 12 February 2005 at 7:38 AM Online Now!
Dave-So posted Sat, 12 February 2005 at 7:42 AM
awesome....great looking dress, sandals, and hat... normals...I have to remember that. How do you like Shade overall ???? obviously you're good with it
Humankind has not
woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound
together.
All things connect......Chief Seattle,
1854
randym77 posted Sat, 12 February 2005 at 9:57 AM
"Normal" is a mathematics term. It means at right angles, perpendicular. It's much used in engineering and science calculations, since a lot of vector math and such is based on geometry. The line labeled n is the normal:
You can see from the illustration how this applies to 3d modelling. The normal shows which side of a polygon is the "right" side.
Weirdly, Poser doesn't actually use normals. It uses one-sided polygons or something like that. (I'm sure someone more knowledgeable will explain.) That's why the "reverse normals" function in some other apps (such as UV Mapper) doesn't work for Poser. The Poser "reverse normals" has the same effect that reversing normals in other apps...but it's not actually reversing the normals.
Okay, I probably just made it even more confusing...
I do like that outfit. I've been wanting a dress like that for Laura, actually. If it's dynamic, you should be able to use it with just about any character.
kuroyume0161 posted Sat, 12 February 2005 at 10:44 AM
To continue what randym77 said: A normal is a vector. It is a vector perpendicular to the plane of the polygon. The direction of the normal (which side of the polygon it points out from) is determined by the order of the points of the polygon. When the polygon is viewed directly from above (so that it appears flat or parallel to the screen, for instance), the common standard is that the points are arranged in a counter-clockwise direction. The normal is then facing directly at you. If they are ordered in a clockwise fashion, the normal points directly away from you. This is why Poser and other apps actually don't need to store normals. They can be calculated from the polygons themselves using the order of their points (vertices). "Reverse normals" changes the order of the polygon's points to flip the direction of the normal.
C makes it easy to shoot yourself in the
foot. C++ makes it harder, but when you do, you blow your whole leg
off.
-- Bjarne
Stroustrup
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randym77 posted Sat, 12 February 2005 at 11:17 AM
The classic way to remember this is the "right-hand rule." If you curl the fingers of your right hand in the direction the points are going, your thumb will be pointing along the normal. (If you look in on a bunch of engineering students taking a test, you'll often see them curling their hands this way.)
But if you're not interested in vector math, all you need to know is that reversed normals means you're looking at the back side of the polygons. Poser 4 is more tolerant of reversed normals than Poser 5. Some things that look fine in P4 have ugly black splotches in Poser 5. It's usually reversed normals.
And if you import an object made in another app, and it looks black no matter what texture you apply, try importing it again, with "reversed normals" checked.
Dave-So posted Sat, 12 February 2005 at 11:33 AM
awesome explanations on the normals...thanks :) why don't they call the reversed normals abnormals?
Humankind has not
woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound
together.
All things connect......Chief Seattle,
1854
operaguy posted Sat, 12 February 2005 at 12:37 PM
gratitude to randy and kuroyume0161... you guys rock. Permanent bookmanrk ::::: Opera :::::
dlfurman posted Sat, 12 February 2005 at 1:45 PM
Dave-So 'cuz then you be taking Psychology not Mathematics (which can make you crazy, then you'd need a Pyschologist!)
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Starkdog posted Sat, 12 February 2005 at 7:25 PM Online Now!
operaguy posted Sat, 12 February 2005 at 8:32 PM
cool stark, we are blinded by your creativity! That draping looks natural. ::::: Opera :::::
randym77 posted Sat, 12 February 2005 at 10:00 PM
Very cute! I usually turn "casts shadows" off for hats, so they don't shade the face too much. Call it artistic license. ;-)