Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: tiagodmed on 2013-04-12, 23:33:34

Title: Bump (bitmap filtering) + glossiness = problem :P
Post by: tiagodmed on 2013-04-12, 23:33:34: I was testing rendering fabrics and came across the following problem ...
I adjusted the fabric material of my testing in a "frame" (close up frame... :P I do not know if this is the correct term, in Portuguese would be "enquadramento"). I adjusted the scale of the texture, bump intensity, glossiness ... And for that "frame" the yield was good.
But when I put the scene late in the "frame", which is further away, the yield had problems (I'd better show than describe, my English is not very good).

Blur 0,5 filtering Summed Area

(https://dl.dropboxusercontent.com/u/2067306/Corona_tecidoTest_02.jpg)

(https://dl.dropboxusercontent.com/u/2067306/Corona_tecidoTest_03.jpg)

(https://dl.dropboxusercontent.com/u/2067306/Corona_tecidoTest_04.jpg)

(https://dl.dropboxusercontent.com/u/2067306/Corona_tecidoTest_06.jpg)
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-04-13, 00:02:28: Can you upload me the scene with the problematic camera (http://corona-renderer.com/upload/)? I suspect this was already fixed in the daily builds
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-13, 22:28:08: I also have problem with bump filtering with the latest legacy daily build, i tried all the modes even the No flitering blur is making my bump incorrect, i really hope it will be fixed soon...
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: tiagodmed on 2013-04-14, 02:55:53: I was cleaning the file to send and I open the material on the slate, only then realized that the bump texture was different from other (blur filter 0.01 and the others 0,5). I'll send this file anyway. But I will also send a corrected, now I did tests with variations in the blur filter (1 - 0,5 - 0,1 - 0,01).
In the background material appearing a strange effect, some "marked" areas.

(https://dl.dropboxusercontent.com/u/2067306/corona_bump_problems.jpg)
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Polymax on 2013-04-15, 21:33:19: Yes, I also encountered the same problem.
Now bump normally works only with parameters: blur = 1, the amount of bump no more than 1, sorrowfully (((
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-15, 21:39:15: Quote from: tiagodmed on 2013-04-14, 02:55:53
I was cleaning the file to send and I open the material on the slate, only then realized that the bump texture was different from other (blur filter 0.01 and the others 0,5). I'll send this file anyway. But I will also send a corrected, now I did tests with variations in the blur filter (1 - 0,5 - 0,1 - 0,01).
In the background material appearing a strange effect, some "marked" areas.

(https://dl.dropboxusercontent.com/u/2067306/corona_bump_problems.jpg)

Yes i have the same weird effect, i've turned off bump for a wood floor because of in a project...
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Polymax on 2013-04-15, 21:44:58: I tested more and found that even with the bump parameters blur = 1 amount = 1 does not always work correctly!
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-15, 22:02:31: Quote from: Polymax on 2013-04-15, 21:44:58
I tested more and found that even with the bump parameters blur = 1 amount = 1 does not always work correctly!

Hope to see it fixed soon
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Polymax on 2013-04-19, 19:55:03: This problem can be solved. Need to adjust the amount of bumps together with the blurring, ie less blur, the less the amount of the bump.
At least I got it. Try it.
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-19, 23:51:55: Quote from: Polymax on 2013-04-19, 19:55:03
This problem can be solved. Need to adjust the amount of bumps together with the blurring, ie less blur, the less the amount of the bump.
At least I got it. Try it.
i've already tried it but i see some weird spots
i will post a scene test that i've done a very simple one.
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-20, 01:46:09: Here's my example :
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Polymax on 2013-04-20, 14:58:18: Ca you post this scene?
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-20, 22:42:57: Quote from: Polymax on 2013-04-20, 14:58:18
Ca you post this scene?

here you go

https://www.dropbox.com/s/pyem2hvxaas0ir6/Test%20%20bump.zip
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Polymax on 2013-04-21, 21:20:59: Quote
i've already tried it but i see some weird spots
Maybe because it is not correct to use a simple color like environment. I just put in the env.slot HDRI image. :)
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: maru on 2013-04-21, 21:39:34: Max12 please?
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Polymax on 2013-04-21, 22:01:21: please :)
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-21, 22:03:08: Quote from: Polymax on 2013-04-21, 21:20:59
Quote
i've already tried it but i see some weird spots
Maybe because it is not correct to use a simple color like environment. I just put in the env.slot HDRI image. :)

yes but it stills a bug without hdri, did you try coronasky with sun ?
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-21, 22:34:28: Is it incorrect to put coronasky in env? here is the same bug
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Polymax on 2013-04-21, 22:44:39: Yes, it's very strange, is irreparable bug ((
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-04-21, 22:58:26: I'll fix it eventually. Just not now, I am pretty sick :/
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: maru on 2013-04-21, 23:00:57: Is it ok to use VrayHDRI in env slot? :D
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-21, 23:01:25: Quote from: Keymaster on 2013-04-21, 22:58:26
I'll fix it eventually. Just not now, I am pretty sick :/

try to relax, get well soon bro !
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: maru on 2013-04-21, 23:09:48: Hey, I'm trying to reproduce this bug but it doesn't appear for me. Tried with solid gray env and CoronaSky and nothing wrong happens...
I'm using alpha4, max2012.
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-04-21, 23:16:00: Quote from: maru on 2013-04-21, 23:00:57
Is it ok to use VrayHDRI in env slot? :D
sure
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-21, 23:20:45: Quote from: maru on 2013-04-21, 23:09:48
Hey, I'm trying to reproduce this bug but it doesn't appear for me. Tried with solid gray env and CoronaSky and nothing wrong happens...
I'm using alpha4, max2012.

really weird, what daily build do you use?
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Stan_But on 2013-04-22, 01:07:15: found some interesting - maybe would helpful in fixing bug
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: maru on 2013-04-22, 11:21:32: Quote from: Chakib on 2013-04-21, 23:20:45
really weird, what daily build do you use?
I'm using public release.
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-04-22, 13:17:23: Quote from: maru on 2013-04-22, 11:21:32
Quote from: Chakib on 2013-04-21, 23:20:45
really weird, what daily build do you use?
I'm using public release.

the public release has no issues with bump and blur filtering, try the latest daily one from dropbox.
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: maru on 2013-04-22, 14:04:47: I don't have access to daily builds. :]
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-04-22, 19:24:15: Quote from: maru on 2013-04-22, 14:04:47
I don't have access to daily builds. :]
why don't you ask for the access then? ;)
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Chakib on 2013-05-03, 17:24:05: this bug still not solved in recent fullspeed build ?
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-05-03, 18:51:18: I dont know, I'll have to test
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-05-22, 18:51:34: I went over the scene. The problems are:
- You use way too much bump
- your bump map is practically a 1D texture, with only horizontal lines. Such texture will turn your material reflections to anisotropic ones. The hard line you see on the floor is actually an anisotropic reflection of the teapot base. This is further highlighted by the fact that corona requires all reflection rays to be above the surface - so there are many rays at the grazing angle, resulting in the sharp reflection of the geometry part which is barely touching the floor. You need to use a bump map with some variation also in the other axis, the problem then disappears
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Stan_But on 2013-06-12, 21:24:53: With little bump value it is just become less visible but not disappear. Even with using square parametric tiles.
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-06-12, 22:05:44: can you post the square parametric tiles scene?
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Stan_But on 2013-06-12, 22:13:30: in attachment.
but i think it is not 'major' status problem

and some pictures for example. It's not reference but maybe so will be better to understand what i mean

looks like works some cutoff in the shadow of teapot and shadows didn't affect on light reflections at the edges of tiles
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Volden on 2013-08-14, 10:45:38: For such cases I`m using displacement

And did someone tried to use normal maps instead of bump?
Title: Re: Bump (bitmap filtering) + glossiness = problem :P
Post by: Ondra on 2013-08-14, 16:04:11: normal mapping should give you the same problems as bump mapping, because it is also fake. Only displacement is correct