I have encountered a strange behaviour with mirroring during an animation. There is a hinge and two plates at the ends. The hinge is animated and one plate is moving and rotating.
The strange behaviour is, that the mirror of the hinge is correct in the not moving plate, but in the moving plate the mirror of the hinge is squashed and bend and I see no cause for that, because the plate is compact without vertex animation.
Here is a small Quicktime MPEG-4 anim (196 KB). I hope all you Linux and Windows users can view this with VLC. The red arrow is pointing to the strange mirror and the white one to the correct mirror.
Did you try a different renderer? THis seems to be more a problem with rendering rather than animating, perhaps more folks would have ideas in a different subform.
The only thing I can think of right now is make sure that you don’t have one surface buried right under another as you can get overlap artifacts with camera clipstart but I don’t see that here.
The entire animation is a technical demonstration of the hinge and will be one minute long. It is nearly done and I have raytraced some frames to see lightning, material and camera are fine. But this strange mirror bending appered after all was rendered, oh no!
I haven’t tryed a different renderer and there is no mesh or object overlapping or something equal. I have checked the entire scene a lot. Seems like that it is truly a render failure. Here I have animated the hinge with the plate, the camera and the main light. By the way, the main light is an area light. May be this is waht causes the problem?
I will exchange the area light and will have a look if the problem will disappear.
Frank
