Author Topic: surface problem  (Read 4931 times)

mapar

    Reputation: 2
surface problem
« on: July 31, 2011, 02:43:27 pm »
July 31, 2011, 02:43:27 pm
Hello,
I have a problem, some surfaces are grooved in the preview and rendering, also without texture. I tried to re shaping and re-import, but nothing.
If I get close with the camera grooved disappear
 3ds Max 2011 ->. Max -> lumion
 3ds Max 2011 ->. FBX -> lumion
 3ds Max 2011 ->. Dae -> lumion

graphic ati 4870  (tested with 2 drivers)

stucki

    Reputation: 32
Re: surface problem
« Reply #1 on: August 01, 2011, 12:25:13 am »
August 01, 2011, 12:25:13 am
i have the same issues with an actual project. seems to me like a shadow problem ...

cpercer

    Reputation: 20
Re: surface problem
« Reply #2 on: August 01, 2011, 04:46:11 am »
August 01, 2011, 04:46:11 am
I'm pretty sure these artifacts do not appear in the output movies or images.  Correct me if I'm wrong.

mapar

    Reputation: 2
Re: surface problem
« Reply #3 on: August 01, 2011, 08:24:09 am »
August 01, 2011, 08:24:09 am

No, You wrong, the first picture attached is an output. I see them also in movie mode...

stucki

    Reputation: 32
Re: surface problem
« Reply #4 on: August 01, 2011, 09:21:40 am »
August 01, 2011, 09:21:40 am
second that

Re: surface problem
« Reply #5 on: August 01, 2011, 11:14:02 am »
August 01, 2011, 11:14:02 am
There can be several reasons for this. The shadow map routine is not 100% accurate so some artifacts can come from this. It's easily resolved by offsetting the shadow or decreasing shadow ranges so the shadow map pixels get smaller.

Also, double sided meshes have more problems with shadows than single sided meshes. Lumion does not support double sided rendering so the only way this can happen is when you render an object together with its inverted version so all polygons have 2 versions, one for each side, effectively making your mesh double sided.

In final render this effect should be reduced drastically because the final render use multiple samples and smoothing to make smoother shadows.

The sun angle also plays a part. The smaller the angle between the sun and the surface the more this effects appears. If you offset the shadow it will disappears. When you increase the shadow resolution the artifacts get smaller until you can't notice them anymore.

stucki

    Reputation: 32
Re: surface problem
« Reply #6 on: August 01, 2011, 11:41:41 am »
August 01, 2011, 11:41:41 am
i can only reduce these artifacts by changing range and clipping ?
what do you mean by offsetting the shadow ? could you explain this for me please.

any chance these artifacts could be reduced in the future ?
they really dont look so good.

i am preparing a movie of an industrial complex where i have this problem very intense.
And i dont want to move the sun location because i need it in exact this position ....

best regards
stucki

Re: surface problem
« Reply #7 on: August 01, 2011, 12:15:45 pm »
August 01, 2011, 12:15:45 pm
The clipping slider is not correctly labeled because it's effectively an offset. Basically it pushes the z of the objects in the shadow maps to reduce artifact. In noticed that on a big scale this slider could use a bit more range though.

mapar

    Reputation: 2
Re: surface problem
« Reply #8 on: August 01, 2011, 05:18:49 pm »
August 01, 2011, 05:18:49 pm
with geforce 560Ti the artifact disappear in output....

stucki

    Reputation: 32
Re: surface problem
« Reply #9 on: August 01, 2011, 05:50:14 pm »
August 01, 2011, 05:50:14 pm
i think this depends on the situation.
with a geforce 580 i have these artifacts on some views.

mapar

    Reputation: 2
Re: surface problem
« Reply #10 on: August 01, 2011, 09:57:17 pm »
August 01, 2011, 09:57:17 pm
sorry, i see artifacts also with 560ti, it isn't a problem of graphic card.
these artifacts are visible only if i use lumion materials editor... with imported materials (textures) these artifacts don't appears.
if i don't put textures inside lumion material editor preview and output are ok

Re: surface problem
« Reply #11 on: August 02, 2011, 04:28:59 pm »
August 02, 2011, 04:28:59 pm
sorry, i see artifacts also with 560ti, it isn't a problem of graphic card.
these artifacts are visible only if i use lumion materials editor... with imported materials (textures) these artifacts don't appears.
if i don't put textures inside lumion material editor preview and output are ok

There is a possibility your build does not have filtering in shadows for final render. This explains the difference between imported materials and Lumion materials. This is corrected in later build of course.

stucki

    Reputation: 32
Re: surface problem
« Reply #12 on: August 03, 2011, 08:55:52 pm »
August 03, 2011, 08:55:52 pm
here comes a small example from a current project.
sorry, but if have done nothing wrong (maybe i did ?) this leaves certanly room for improvements.

in other words, in this state it isnt useable for me in this project ..

i hope you guys can improve this.

best regards

P.S
in some more testing i found that this only occurs when a standard material is apllied to the object.
hope this helps

mapar

    Reputation: 2
Re: surface problem
« Reply #13 on: August 03, 2011, 09:13:36 pm »
August 03, 2011, 09:13:36 pm
put texture in your 3d software (3ds max??)
export to FBX or collada
import model into lumion
don't touch material

now it's ok?

stucki

    Reputation: 32
Re: surface problem
« Reply #14 on: August 03, 2011, 09:18:41 pm »
August 03, 2011, 09:18:41 pm
put texture in your 3d software (3ds max??)
export to FBX or collada
import model into lumion
don't touch material

now it's ok?


still some artifacts but much much better.
but now i dont have any control over reflection, brightness etc in lumion, that is needed ...