ib4: I also postet this on the blender forum, since I did not know this forum 10 minutes ago
I followed a Tutorial of the german video-training of Helge Maus. In the tutorial he showed how to set suzanne transparent.
The Material settings on suzanne are:
Diffuse Intensity: 0
Transparency: checked & Raytrace
the rest is set to the default values
In the Scene is a tin, suzanne, a floor and walls. All are set up to recieve transparent shadows. And the one lamp in the scene is set to ray Shadow.
There is a blue sky in the scene too.
Now, when i render that scene on my PC (win 7, ATI HD 5850 (drivers are up to date)) i have a strange reflection of the sky at suzanne. I know that it is the sky because when i change the color of the sky, the color of that “reflection” changes too.
There is no Mirror set up @ suzanne.
When Helge Maus renders that scene in the video everything looks great and there are no black or blue artifacts.
Iam using Blender 2.57b
Thanks for any help,
EDIT: I have the same broblems with this .blend-File: http://wiki.blender.org/index.php/File:Manual25-Material-3GlassesExample.blend . When I render it, there are black artifacts at the upper border of the glasses
EDIT2: I used the Blender Renderer