[Sidefx-houdini-list] New graphics driver messing up lighting in viewport

Mark Alexander malexander at sidefx.com
Mon Mar 14 12:29:48 EDT 2011

I'm not sure why, but the GLSL gl_FrontFacing builtin appears to return 
the wrong value in Cat 11.1+. This broke before on OSX for a time, so 
there is a workaround:

mv $HH/ogl2/ogl2_face_forward.func $HH/ogl2/ogl2_face_forward.func.bak
cp $HH/ogl2/ogl2_face_forward_osx.func $HH/ogl2/ogl2_face_forward.func

(where $HH is <installdir>/hfs/houdini)

It's on my TODO list to either workaround or get an ATI driver fix for 
this issue.


On 03/14/2011 12:48 AM, Craig Hoffman wrote:
> Anyone else update their ATI drivers to the latest ones
> (http://support.amd.com/us/kbarticles/Pages/AMDCatalyst112ReleaseNotes.aspx)
> that supports Open GL 4.1 and find that all the lighting in Houdini's
> viewport doesn't work at all?
> After doing some trial and error I find that if I create normals and reverse
> them in Houdini it seems to light correctly.  Is there something in the
> graphics drivers or Houdini settings that might be forcing normals to be
> reversed?.
> Running H 11.0.658 on 64 bit Win7 on a Core i7 Lenovo laptop with ATI 5730
> GPU.
> Cheers,
> Craig
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