Hi Enrico,
Enrico Borrione wrote:
> hi opensg users,
>
> i am doing some operations on models imported
>>from obj files. When i do some tasks with normals and
> indices, like swapping face normals, eventually i get
> stuck in wrong displayed geometries.
>
> i.e. the famous knot model from 3ds is displayed with
> most of the triangles missing or displaced.
>
> Since i am having such problems just with OBJ imported
> models, I was wondering what must be wrong with them.
AFAIK the OBJ loader creates geometries that contain only GL_POLYGON
primitives.
> My best shot is something about how triangles are defined,
> like presence of TRIANGLES_STRIPS or TRIANGLES_FAN.
> Is there a fast way to check the geometry node
> vs triangle organization/indexing? And then for reducing
> the geometry to simple list of triangles (which i assume
> would be safer to use during geometry manipulation)?
Do you disable the default GraphOps? By default the loaders apply a set
of optimizations to the loaded scene, among them striping of geometries.
You can disable them with:
SceneFileHandler::the().read("fileName", NULL)
Hope it helps,
Carsten
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