OpenGL artifacts

[slouchcorp]

Hi tito,

It looks to me like you have some backfacing normals? could be totaly wrong thoe:rolleyes:

try selecting all the polys and right click align normals.

HTH MIke.

[Srek]

Hi Tito,
this is most likely caused by your graphics card drivers. Have you installed the latest ones? What kind of graphics adapter do you use?
atb
Srek

[knight42]

I get this alot, particularly with polys that are close together - the backface option affects it, but it is video drivers or hardware (in my case matrox).

J

[zued]

one little note..

If thats an imported mesh, try to add a Phong tag to your object..then press Angle limit..
helped me.. in some cases.. ;)

[ThirdEye]

Definitely an OpenGL issue. :hmm:

[pit]

I get this a lot too - ATI FireGL 8800 and latest drivers - and it´s not a new problem - had it happen under R7 as well. It appears in one of Maxons own videos for R8 :eek: (don´t remember which one though), so it should be a known issue. It will disappear if you change camera perspective (->Camera) and return to default. Annoying all the same!

[ThirdEye]

What happens in that video (the modeling video with HN weighting) is a frame that appears in that way INSTANTLY BEFORE the rendering. The program is faster to start the rendering process than the videocard to refresh the view, that's nothing strange. Tito's problem seems to be an OpenGL issue more than a program issue. He told us the same thing happened to him with XSI so it's probably a driver issue. :hmm:

[ThirdEye]

BTW what's your video card Tito? :shrug:

[lildragon]

Thx much guys, I'll try some of your suggestions tonight, apparently it started to happen when I was playing around with the backface culling options :shrug: Anyhoo I have an Asus Geforce 3 ti200 w/ 128 ddram (I'll be getting a geforce 4 quaddro soon) and I installed the latest drivers from Nvidia's site.

BTW here's the same card at work in XSI http://www.cgtalk.com/showthread.php?s=&postid=273812#post273812

[LucentDreams]

it says there that R to refresh fixed it, what about A in C4D to redraw, see if that works.

[pit]

I´ve experienced the problem back when I had C4D running on a Mac (ATI Radeon 8500) and now on my PC with the FireGL card - which drivers should be optimized for CAD and 3D Apps. Now learning that the problems exists with a Geforce card too, leaves room for speculations - other than both ATI and Nvidia having faulty drivers. As stated above, I know the problem since R7 - didn´t occur in R6 - and it happens, when I zoom very close to the model. I guess this really is a question for Maxon support team. (Hmmm... but If Srek doesn´t know about the problem ..... nobody else will!! :D )

[LucentDreams]

see as for myself, with and ATI 9000 and before that a matrox G450 I haven't encountered the problem.


Hmmm

[pit]

Strange ......
Well, it´s no big deal, as you learn to deal with it, but would ofcourse be nice not to have this break in workflow.

[pit]

Btw. hitting A doesn´t solve the problem - shifting cameramode will.

[lildragon]

Originally posted by pit
shifting cameramode will.

shifting cameramode? :curious: Forgive me I'm new ;)

-lil

[ThirdEye]

I think he means create a new camera and use it instead of editor mode. :shrug:

[knight42]

Nope, that doesn't affect it. My G550 is really bad for doing this, and backface culling really screws it up even worse. Software shading doesn't have the same problem, but it's only fast enough for simple scenes obviously.

Now I've heard all those other graphics cards are doing the same thing, I think I'll delay my upgrade :hmm:

J

[Editid for bad tiping]

[pit]

Sorry for my bad english - I meant to say:
In the perspective viewport: Camera -> change to Parallel (or any other) -> change back to perspective.
That´ll do the trick.

Cheers

[lildragon]

Originally posted by pit
Sorry for my bad english - I meant to say:
In the perspective viewport: Camera -> change to Parallel (or any other) -> change back to perspective.
That´ll do the trick.

Cheers

What the :surprised that worked like a charm bud :surprised thx :D

Hmm I guess its like hitting the tele when it starts to show snow :)

salud

[AdamT]

I get this occasionally, too (Ti-4600), and it clears up if I do a View-->Edit-->Frame Default. Same as switching modes I guess, but one less keystroke.

[imashination]

Hi, where was this scene from? gfx cards use Zbuffers to help display the images, this is effectively an image which is used to cut off objects in front and behind each other. This image only has a certain amount of resolution available, so if a scene is extremely zoomed in, or extremely zoomed out then you can reach the limits of the zbuffer.

Due to different scales used throughout the packages, several imported scenes can use much smaller scales, thus reaching this limit much faster. Try to keep objects at comfortable scales such as 1 - 10,000 units wide. You can do this by scaling after loading, or by changing the default import scales under Edit > Preferences.

[CGTalk Moderation]

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.