[Octave-bug-tracker] [bug #42006] set (h, "facelighting", "flat") renders dark surfaces/patches

[Markus Mützel]

Follow-up Comment #5, bug #42006 (project octave):

While working on a patch to implement lighting in Octave (please see patch
#8943), I encountered the same problem.

It looks like "glEnable (LIGHTING)" should only be called for patches and
surfaces if a light object is present in the axes. Otherwise, the objects are
"rendered in the dark", hence black.

The attached patch checks the "Parent" of the "patch" or "surface" objects for
"Children" of "Type" "light". Is this the correct way to check for other
objects of a certain type in the same axes?
Only if a light object is present, lighting is activated.

As I am neither an expert in C++ nor OpenGL programming, I would appreciate
any help, tips, info and opinions. 

This change reflects the behavior of Matlab when "FaceLighting" is set to a
value other than "none" and no light object is present.

The link in comment #4 gives an error 404 for me. Is there a newer link?

(file #36635)
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Additional Item Attachment:

File name: bug42006.patch                 Size:4 KB


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