Smoothing problem

[ycarry]

Roubal: Not in this case of "pro/E format read by Blender";
I try subsurf first and have good result... until I move object in light where faceted (sudivided) sides appear,
like some bloody "MoI to Octane" sunday.

[danvica]

Thanks to everyone.

I'll start to be a little confused.

Just a breif summary:
1. I don't model in Blender but in Pro/E
2. I import the part in Blender using SLP format
3. I had a major smoothing problem that I (well actually mib2berlin and ycarry) solved using smooth + edge split
4. When importing in O.R. (with modifier exported) I still found some strange reflection (see pict)

Using subsurf on a mixed sharp/smooth part is (as far as I use it) not good. But I could be wrong, I'm way far to be a Blender expert.

I'll do some other test, with part imported and part created in Blender, in the same scene....

In the meanwhile thanks for any hints...

[danvica]

By the way, I forgot to remark that when I setup a simple scene with just the pro/e part smoothed+edge splitted and a blender sphere the reflection on the part is good. No strange ripple on it.
See reflb6.jpg on my prev post. The sphere is out of view, you can see just the reflection.

Daniele

[danvica]

I'm very sorry to keep this thread so...questioning but I have to solve this problem.

I did another test adding in the same scene a Blender sphere, just to avoid any problem due to pro/e export/import.

Here enclosed you can see the same view with and without the 'smooth' material parameter activated (just on the chromed part).

The reflection is perfect when the O.R. smooth is not applied but the surface of the part is then faced... any workaround ? Maybe using some other tool to setup the scene instead of Blender.

[ycarry]

Prob is on smoothed object in blender: is it the same as prec. test object?

[danvica]

Yes. I don't understand why having a scene with just the pro/e part (smoothed and edge splitted in Blender) and a blender sphere the reflection is good (with the material smoothed also in Octane).

You can see the test in one of my previous post.

I'm start to be confused. I need more test.

[ycarry]

I see other smooth prob (visible in Blender too) but not the face effect you have...

slp_reflect.jpg (3.66 KiB) Viewed 4760 times

How are import obj options in Octane?
and by the way: show dialog option when you export from Pro/E to slp, please.

[danvica]

With just the part + a sphere I obtain good result too.

The problem is in the complete scene.

I used the standard importing options for all the scenes.
I can't now but later I'll post the dialog box of both Octane and PRO/E (actually the last is just regarding the way the surface is triangulated: chord height and angle control, I use the maximum allowed).

[danvica]

Well. It seems I messed up something in the Blender setup.

I did another test: in the same Blender scene I imported a new istance of the assembly. I applied smooth + edge split a 10 degree, and exported everything.

In Octane the reflection seem good. No more ripple. I don't know what I've done in order to create them.

The only remaining problem are:
- Small irregular imperfection into the reflection at the border of the part.
There's a round on this edge that maybe is not well coded by Pro/e.
- Curved reflection onto the flat surface. See the difference setting or not the smooth option in Octane material.

[ycarry]

Note 10° angle was because if >10 you loose an interior face on test object when set smooth,
but thats not a standard/best angle value!
you need to manage objects: add sharp edges here, crease this one, subdivide such face, etc...
Thats why I ask export setup from pro/E