After some more digging I kind of have a feeling for what is happening but again I have too little knowledge of the OSG internals to really understand what is going on...
When looking at the culling phase I see that there is the root render stage, then 2 levels of pre render bins (excluding root level). First the root render stage has the correct light attribute in its _renderStageLighting and a null _inheritedPositionalStateContainer, then the 1st level _preRenderList render bin's _inheritedPositionalStateContainer is from the parent render stage _renderStageLighting. Its _renderStageLighting however is not inherited and contains no light attributes. Therefore on the 2rd level pre render bin the _inheritedPositionalStateContainer is from the 1st level _renderStageLighting, but this has an empty _attrList... Basically it seems that when having a hierarchy of pre render stages / bins the light attribute does not trickle down the hierarchy and is not applied before my geometry is drawn... Not sure if that makes sense... Any idea ? cheers, guillaume ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Poirier, Guillaume Sent: September-19-11 5:16 PM To: OpenSceneGraph Users Subject: Re: [osg-users] Lighting problem when using help or stats handler Hi Paul and al., Yes the geometries do have color and normal arrays. From what I understand the problem is that the scene light is applied only after the geometry is drawn, therefore using last frame light settings when drawing the geometry. Since the help / stats handlers apply their default light at the end of the frame, it will be used for the next frame scene render. This render order issue seems to be directly related to the implementation of the EffectNode and its overriding of the traverse() and cull() functions. cheers, guillaume ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Paul Martz Sent: September-19-11 4:56 PM To: OpenSceneGraph Users Subject: Re: [osg-users] Lighting problem when using help or stats handler On 9/19/2011 2:43 PM, Poirier, Guillaume wrote: Hello OSG users, My problem is simple to describe: When in our application we press 's' or 'h' to display either the stats or help, the lighting changes when it should not. Check to make sure that all Geometry objects in your scene specify a color array and a normal array. OSG does not provide a default if these are missing, so they inherit the value last set in the OpenGL state machine. Both affect lighting (color affects lighting because OSG's default is to enable GL_COLOR_MATERIAL if no Material StateAttributes are present). -Paul
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