CGTalk - why do poly's get dark

View Full Version : why do poly's get dark

crgowo

08-16-2003, 11:16 PM

Im trying to model a cartoonish looking pig and i modeled the body and head seperatly welll i have yet attach the two. but when i snapped my vertices form the head to the body so they matchup. the neck gets dark and when i render it stays dark. Why does this happen?
here is a pic of whats going on.

http://home.elp.rr.com/ss/mayaerror.JPG

is there a way to fix this without having to remodel the head? THanks

btw when i look up at the neck polygons they turn normal colored in shaded view. but the camera needs to be loooking up angle to be normal shaded.

swag

08-16-2003, 11:49 PM

have u combine the 2 geos and merge the vertices? look at the normals - go in the subd mode and back to poly
... some clues

MikeRhone

08-16-2003, 11:51 PM

I get this sometimes as well. I dont know why it happens, but here is a quick workaround.

Grab any one edge on your model and do an Edit Polygons--> Bevel. That should fix that wierd "blackness" thats happening. Now go in and fix the area you added the bevel to and deete any of those extra edges.

**Note, adding a bevel will delete any UV mapping you have applied to the object.

Hope this helps, and please reply if it does.

Mike R

crgowo

08-17-2003, 02:19 AM

Originally posted by Rhonedog

Grab any one edge on your model and do an Edit Polygons--> Bevel. That should fix that wierd "blackness" thats happening. Now go in and fix the area you added the bevel to and deete any of those extra edges.
Mike R

hey thanks it worked. that was strange. wonder why that happens.

swag: na i havent combined the 2 geometies yet but i tried that and it didnt work. and ya hte normals were correct.

THanks for your help guys.

Wigaru Wiyamoto

08-17-2003, 05:45 AM

Try this: Edit Polygons > Normals > Set to Face, then Edit Polygons > Normals > Average Normals.

crgowo

08-17-2003, 05:54 AM

Originally posted by Wigaru Wiyamoto
Try this: Edit Polygons > Normals > Set to Face, then Edit Polygons > Normals > Average Normals.

that worked as well. what does set to face do exacltly?

Wigaru Wiyamoto

08-17-2003, 06:13 AM

It sets the shading for polygons to faceted. When you do extrusions and whatnot Maya likes to assume how you want to shade the new faces (hard soft, etc), setting the normals to faceted sort of "resets" it. Then you can average the normals to make it smooth shaded again.

SouL

08-17-2003, 09:07 PM

I find that it's better if you select all your vertices and then go to
Edit Polygons > Normals > Set Vertex Normals Option Box

Make sure Unlock Normals is checked and hit Apply. That should fix all your problems.

The problem with Setting the normals to faces then averaging them is that Maya will overide your hard edges and make them smooth.

I always have my wireframe show me my hard/soft edges so I can make sure that my hard edges are where they're supposed to be and to catch these weird normal errors when modeling.

CGTalk Moderation

01-15-2006, 07:00 PM

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.