mmp/pbrt-v4-scenes

Empty Object Groups

Xaldew opened this issue · 3 comments

Xaldew commented

Hello,

I happened to be working a little bit on the Landscape scene, and noticed that there seems to be a few empty Object groups/instances:

AttributeBegin
    ObjectBegin "Brennnessel Instance.4"
    ObjectEnd
AttributeEnd

AttributeBegin
    ObjectBegin "xref_Picea_5mt.c4d Instance"
    ObjectEnd
AttributeEnd

Is there perhaps some missing geometry here, or am I misunderstanding how the (empty) ObjectBegin statement works?

mmp commented

Interesting! Those should be no-ops, with no effect on the scene that is rendered. I assume that they are an artifact of the automated scripts used to export the original scene to pbrt's format.

Xaldew commented

Good to know, thanks! I also found some more oddities, such as many empty AttributeBegin blocks and MakeNamedMaterial without a corresponding NamedMaterial (but with an "anonymous" Material instead), do you want me to report similar things I come across or is that really just a bit of noise?

mmp commented

No need to report that sort of thing unless there's some evidence that it's affecting rendering (though that would likely indicate a pbrt bug in any case...)