View Single Post
Old 17th March 2012, 08:10 PM   #1
MacCekko
Junior Member
Junior member
 
Join Date: Mar 2012
Posts: 2
Question Graphic glitch on AMD Radeon HD6970M (iMac 27" Mid 2011 - OS X 10.6.8)

Hello to everyone.

This is my first thread here, although every now and then I come here to take a look at the AC3D Forums.

I am having the following problem, quite difficult to describe in words; it would be definitely be better to post a movie, but anyway, I'll give it a try:
I have recently bought an iMac 27" (mid 2011) with an AMD Radeon HD 6970M graphic card with 2 Gigs of VRAM. Before I used an iMac 24" (early 2008) with an Nvidia GeForce 8800GS graphic card on wich I did not have the same troubles.
I cloned via Time Machine my entire System and therefore ended up with the new iMac with ALL that was on the "old" iMac, so I found myself with a working copy of AC3D for Mac on the new Mac as well.
Now for the problem.
While on the old iMac everything was fine, on the new iMac, when constructing objects in AC3D, when I have a semi-transparent surface OVER an opaque sutface, the semi-transparent is not always completely transparent. If I zoom in, I get a perfect transparency, but when I zoom out a bit, the transparency begins to fill up with some artifacts, made of diagonal lines. These lines are not "frozen", but they tend to move in a kind of circular way when I move my view around with the mouse. The more I zoom out, the more the lines become so thin that at some point, they are quite (if not at all) invisible. The more I zoom in, the more depth these lines tend to acquire until at some point, I cannot see what is shown under this semi-transparent surface.
This particluar error seems to be affecting ONLY the 3D view, while the orthogonal views are perfect.

I clearly suspect some glitches on the graphic card driver, but since Apple had not released (as always I may add!) any updates for my OS, I do not know how I may try to solve the problem.

I tried also to create and login onto my system as a completely new user with admin privileges, but the problem remained.

Now, the only thing I may try to do would be to re-install a fresh copy of AC3D, but I guess this would not be of great help. And before doing that, I wanted to try the AC3D Forums...

Anyway, I am writing here to see if someone else has encountered my same problem.
I want to point out that this seems much more a graphic glitch rather than a really big problem, since I can manage to work even with this error, but still, as for this particular trouble, sometimes I regret not being working on my old iMac, on wich the view was perfect!

Hope to receive some help from your experiences.

Thank you very much and please, excuse my bad english.

Cheers,

Last edited by MacCekko; 17th March 2012 at 08:14 PM.
MacCekko is offline   Reply With Quote