Hey folks,

Happy Holidays!

I made this DVD “motion menu” (a movie).  The overall movie is linked below, as well as two details.

I was getting this “flickering” of light on the pitted bakelite dials.  There was a subtle bump map on the dials, to make them look deteriorated.

I suspected it had to do with Geometry, so when I did a detail rendering with Geometry turned off, the flickering in fact disappeared. 

The scene uses three lights and GI.  The GI is set w 340 Primary rays and Color Tolerance of 8.  There are texture maps on everything. 

Can someone tell me what’s happening?

Many thanks!!  Richard

Overall movie: http://www.chenarch.com/a2_2_h264.mov
Render with Geometry:  http://www.chenarch.com/w_bump_h264.mov
Render without Geometry:  http://www.chenarch.com/wo_bump_h264.mov

Try to reduce the bump value, or try to increase a sampling level to 2X2 for that geometry only.

Seems like only the bumps on the buttons flickers… Have you tried rendering with bumps but without texture? I suspect the bumps picks up the flickering of the movie on the screen.

What are you modeling with Richard ?

Reuben

Looks like flickering speculars to me. I guess it has nothing to do with GI. Try to raise the sampling of the groups to 2x2 or even 4x4, and set your antialiasing settings accordingly. Also, you can try to blur the bump in the bump maps filter tab. And finally, maybe you can use the bump map as a specular map and completely get rid of the bump since it is not visible anyway but in the speculars.

Jens