Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: Chakib on 2013-08-06, 19:58:27

Title: Bump bug ?
Post by: Chakib on 2013-08-06, 19:58:27

Hi guys,

I was testing  one of my latest scenes, and i did use the latest  legacy daily build in dropbox,  i've found a new bug in the floor's bump i didn't understand but here are some renders to explain :

No Bump :
(http://imageshack.us/a/img708/7238/tqe2.jpg)

Bump 0.1
(http://imageshack.us/a/img594/615/xvsa.jpg)

Bump 0.05
(http://imageshack.us/a/img854/622/eh29.jpg)

I don't know if it is some weird reflection distance or something else...

Title: Re: Bump bug ?
Post by: Chakib on 2013-08-06, 20:03:36

I've found also that using other bump textures do produce this bug when i increase the bump value juste a little bit.

Title: Re: Bump bug ?
Post by: maru on 2013-08-06, 20:28:30

By this 0.1 and 0.05 you mean bump strength or bitmap's blur?

Where is your light source and what is it?

Title: Re: Bump bug ?
Post by: Chakib on 2013-08-06, 20:32:09

Quote from: maru on 2013-08-06, 20:28:30

By this 0.1 and 0.05 you mean bump strength or bitmap's blur?

Where is your light source and what is it?

Bump strength, the bump blur is 0.2

i use  hdri map + 1 rectangular corona light

Title: Re: Bump bug ?
Post by: maru on 2013-08-06, 22:13:38

And what happens if you set blur to 1.0?

Title: Re: Bump bug ?
Post by: Polymax on 2013-08-07, 09:49:10

Can give the scene?

Title: Re: Bump bug ?
Post by: Ondra on 2013-08-08, 21:05:28

Looks kinda like the good old excessive bump bug. Can you give me the scene?

Title: Re: Bump bug ?
Post by: Chakib on 2013-08-09, 00:35:24

I'll prepare the scene very soon.

Title: Re: Bump bug ?
Post by: Chakib on 2013-08-09, 00:56:39

i did test the value 1 for bump Blur  and it doesn't help the same bug is here.

Title: Re: Bump bug ?
Post by: Chakib on 2013-08-09, 01:55:53

Here is the scene :
https://www.dropbox.com/s/5wq146ouw1mew2j/bump%20bug%20scene.zip

Title: Re: Bump bug ?
Post by: Polymax on 2013-08-09, 10:41:56

Here bump = 0.03, blur=0.2. Looks very good!
(http://clip2net.com/clip/m210717/thumb640/1376037669-clip-60kb.jpg) (http://clip2net.com/s/5xh7M3)

Title: Re: Bump bug ?
Post by: Chakib on 2013-08-09, 14:54:53

Quote from: Polymax on 2013-08-09, 10:41:56

Here bump = 0.03, blur=0.2. Looks very good!
(http://clip2net.com/clip/m210717/thumb640/1376037669-clip-60kb.jpg) (http://clip2net.com/s/5xh7M3)

try 0.05 ! it's not normal.

Title: Re: Bump bug ?
Post by: Polymax on 2013-08-09, 18:42:15

You may set "Max normal dfference" to 0.1 and use bump = 0.1.
But for the bump while there are some limitations in the upper limit of value.

Title: Re: Bump bug ?
Post by: Chakib on 2013-08-10, 20:47:16

It seems that MAx normal difference 0.1 works here

(http://img407.imageshack.us/img407/8437/e3fj.jpg)

but i don't understand how to configure it depending on the value of the bump, is it a work around for a bug or a correct way or what?

Title: Re: Bump bug ?
Post by: foxid on 2013-10-08, 09:21:05

bump gives really strange results...

Title: Re: Bump bug ?
Post by: Ondra on 2013-11-27, 00:23:10

Ok, I've fixed a probable cause for this bug and now I cannot reproduce your problem. Seems fixed ;)

Title: Re: Bump bug ?
Post by: Chakib on 2013-11-27, 02:17:21

Quote from: Keymaster on 2013-11-27, 00:23:10

Ok, I've fixed a probable cause for this bug and now I cannot reproduce your problem. Seems fixed ;)

Nice thanks Ondra, would be great if possible a legacy update.