Faceting Tweet

[Seekerfinder]

Hi Paul,
Turns out Revit has a terrible faceting problem... And I can find no way to increase facets (if someone knows, by all means enlighten me!). The strange thing though is that 'smoothed' for the material is ON in Octane and while it improves it a lot, I still see the facets. I tried setting Triangulation Level to 1 and reloaded the model to no avail.

Any idea why material smoothing does not solve this?

Best,
Seeker

PS: 2 minor bugs...
1. The Triangulation Level field accepts any integer - including greater than 1.
2. The Edges Rounding slider only kicks in at around the 80% mark. But why is it even here if it can not work with Revit?

Faceting

[face_off]

Seeker, there are two option here. 1) The vertices of each polygon are not joined (is in effect, each polygon is a separate mesh object and therefore smoothing is broken). I doubt it is this one....or 2) More likely it is a rayepsilon issue. Try reducing the rayepsilon - since the default is set for larger render areas.

1. The Triangulation Level field accepts any integer - including greater than 1.

I think this config field is only used for Revit 2013, so will not effect how a Revit 2014 or 2015 scene is loaded into Octane.

2. The Edges Rounding slider only kicks in at around the 80% mark. But why is it even here if it can not work with Revit?

Rounded edges requires the polygons of the object to have shared vertices - and Revit does not provide geometry from the Revit scene in this fashion. It generally treats each flat "face" (which might be many polygons) of a Revit object as a separate entity, with separate vertices, so the round edges do not work. If you import an OBJ, and it uses shared vertices, the round edges should work.

Paul

[Seekerfinder]

Hi Paul,

Seeker, there are two option here. 1) The vertices of each polygon are not joined (is in effect, each polygon is a separate mesh object and therefore smoothing is broken). I doubt it is this one....or 2) More likely it is a rayepsilon issue. Try reducing the rayepsilon - since the default is set for larger render areas.

I don't think the vertices are broken. It's created with Revit' Revolve tool, which i think is pretty solid & simple. It's not a rayepsilon issue either since that was the first thing I checked. It turns out that Revit does not allow any control over the vertices count - possibly to save memory? I found a number of others online identifying this issue.

1. The Triangulation Level field accepts any integer - including greater than 1.

I think this config field is only used for Revit 2013, so will not effect how a Revit 2014 or 2015 scene is loaded into Octane.

Should it be removed from future releases if it's redundant?

2. The Edges Rounding slider only kicks in at around the 80% mark. But why is it even here if it can not work with Revit?

Rounded edges requires the polygons of the object to have shared vertices - and Revit does not provide geometry from the Revit scene in this fashion. It generally treats each flat "face" (which might be many polygons) of a Revit object as a separate entity, with separate vertices, so the round edges do not work. If you import an OBJ, and it uses shared vertices, the round edges should work.

Ah yes. I forgot that Revit can't take advantage of rounded edges. Such a shame since it would be really helpful for archviz.

Best,
Seeker

[face_off]

Seeker - if you still have it - could you send me the .rvt file with that object? I would be interested to better understand why it is rendering as it is.

Paul

[Seekerfinder]

Seeker - if you still have it - could you send me the .rvt file with that object? I would be interested to better understand why it is rendering as it is.

Paul

Hi Paul,
It should be the same with any revolved element (in-place family). But I sent you the file by PM anyway.

Cheers,
Seeker

[face_off]

Seeker - I had a look at that model. In summary, it's material is "Default", and has smoothing OFF. So turning smoothing ON, Set a very low ray epsilon (0.00001), and it renders OK, although because of the way the geometry is constructed - there are a number of different non-connected pieces to that geometry, which create problems. The lid is not connected to the body. And each of the tiers in the base are not connected. Because of these disconnected surfaces, you cannot subd to improve this. As an experiment, export to OCS, then load the exported OBJ into a modelling app - then you can see all the different pieces.

Paul

[Seekerfinder]

Paul,
Thanks for looking into this.

Seeker - I had a look at that model. In summary, it's material is "Default", and has smoothing OFF.

That's because I copied and copied that element out of the model and pasted into a separate file. As you will see, the image I posted is not the default material and smoothing was ON.[/quote]

So turning smoothing ON, Set a very low ray epsilon (0.00001), and it renders OK,

I played with ray epsilon but the best result I got was what I posted. I would appreciate if you could post an image of the smoothest render you get on that.

although because of the way the geometry is constructed - there are a number of different non-connected pieces to that geometry, which create problems. The lid is not connected to the body. And each of the tiers in the base are not connected. Because of these disconnected surfaces, you cannot subd to improve this. As an experiment, export to OCS, then load the exported OBJ into a modelling app - then you can see all the different pieces

That frustrates me. I used the native revolve tool out of Revit. It's a mature modelling application. Why they create poor meshes is beyond me!

Best,
Seeker

[face_off]

I would appreciate if you could post an image of the smoothest render you get on that.

I'm sorry Seeker - I didn't keep a copy of the render or scene.

Paul

[Seekerfinder]

I would appreciate if you could post an image of the smoothest render you get on that.

I'm sorry Seeker - I didn't keep a copy of the render or scene.

Paul

No problem, Paul. You could just create a cylinder using Revit's revolve tool with around a 200mm diameter. I'd like to see the junction between and end face & sides with your recommended settings in Octane.

Best,
Seeker